Compaq Contec RS 232C User Manual

COM-2(PC)F  
RS-232C (2ch) Serial I/O Board  
User’s Guide  
Product Configuration  
- COM-2(PC)F Board…1  
- Sample Program Diskette (3.5inch/1.44MB)…1  
- User's Guide (This Booklet)…1  
Unpacking:  
This board is specially packed in an anti-static bag to prevent  
damage in shipping.  
Check the contents to make sure that you have everything listed  
above. If you do not have all the items, contact your distributor  
or CONTEC group office where you purchased.  
Note!  
Do not remove the board from its protective packaging until the  
computer case is open and ready for installation. Electrical static  
can cause damage to electrical components.  
ii  
COM-2(PC)F  
Table of Contents  
Copyright............................................................................i  
Trademarks ........................................................................i  
Product Configuration ..................................................... ii  
1. Introduction ............................................................. 1  
About the COM-2(PC)F Board.....................................1  
Support Software of Option..........................................1  
Features.........................................................................1  
Limited Three-Year Warranty......................................2  
How to Obtain Service..................................................2  
Liability .........................................................................2  
About the Manual.........................................................3  
2. How to Use the Board ............................................... 5  
Compatible Mode and Enhanced Mode ...........................5  
Compatible Mode ..........................................................5  
Enhanced Mode.............................................................5  
Operating under Windows Me/98.....................................6  
Procedure.......................................................................6  
Operating under Windows 95.........................................10  
Procedure.....................................................................10  
Operating under Windows 2000.....................................14  
Procedure.....................................................................14  
Operating under Windows NT .......................................18  
Procedure.....................................................................18  
Operating under Windows 3.1........................................19  
Procedure.....................................................................19  
Operating under MS-DOS..............................................20  
Procedure.....................................................................20  
3. Hardware Setup ..................................................... 23  
Names of Board Components .........................................23  
I/O Address Setting.........................................................24  
Setting Procedure .......................................................25  
Interrupt Level Setting...................................................26  
Setting Procedure .......................................................26  
COM-2(PC)F  
iii  
Mounting Method............................................................28  
Connecting the External Devices...................................31  
Connecting the Cable......................................................32  
4. System Reference.................................................... 33  
Specifications...................................................................33  
Circuitry Diagrams.........................................................34  
Block Diagram.................................................................34  
5. Troubleshooting ...................................................... 35  
QUESTIONS: ..................................................................35  
Is the pilot light on?....................................................35  
Did the system boot up? .............................................35  
Does your program work?...........................................35  
Does the sample program work?................................36  
Is the input data accurate?.........................................36  
Still have a probrem?..................................................36  
6. Appendix ................................................................ 39  
A. Sample Programs (for MS-DOS)................................39  
COM-2(PC)F Diskette ................................................39  
Sample Programs........................................................40  
Switch and Jumper Settings......................................42  
Cable Connection........................................................44  
B. Notes on Developing Driver Software.......................56  
Internal Registers.......................................................56  
Baud Rate Selection....................................................57  
LSI Recovery Time......................................................58  
Various Aspects of Interrupt Handling in Enhanced  
Mode and Compatible Mode.......................................60  
C. The Details on NS16550 ............................................62  
D. Difference Between the COM-2(PC)F  
and COM-2(PC)V.......................................................64  
7. Index ..................................................................... 65  
iv  
COM-2(PC)F  
List of Figures  
Figure 3.1. Names of Board Components and Default Factory  
Settings ..................................................................... 23  
Figure 3.2. I/O Address DIP Switch............................................ 25  
Figure 3.3. Interrupt Level Settings............................................. 26  
Figure 3.4. Rear Panel of IBM-PC/AT......................................... 28  
Figure 3.5. Removing the Cover.................................................. 28  
Figure 3.6. Expansion Slot Cover................................................ 29  
Figure 3.7. Anchoring the COM-2(PC)F..................................... 30  
Figure 3.8. Interface Connectors (CN1 and CN2)........................ 31  
Figure 3.9. CN1 and CN2 Pin Assignments ................................ 31  
Figure 3.10.Example Connection to a Modem ............................. 32  
Figure 3.11.Example Connection to a PC..................................... 32  
Figure 3.12.Example Connection to a Device............................... 32  
Figure 4.1. Circuitry Diagrams.................................................... 34  
Figure 4.2. COM-2(PC)F Block Diagram.................................... 34  
Figure 6.1. Floppy Disk Files...................................................... 40  
Figure 6.2. 9-pin Connector Diagram.......................................... 44  
Figure 6.3. Flowchart of Sample Program 1................................ 45  
Figure 6.4. Flowchart of Sample Program 2................................ 46  
Figure 6.5. Flowchart of Sample Program 3................................ 47  
Figure 6.6. Flowchart of Sample Program 4................................ 48  
Figure 6.7. Flowchart of Sample Program 5................................ 49  
Figure 6.8. Flowchart of Sample Program 6................................ 50  
Figure 6.9. Flowchart of Sample Program 7................................ 51  
Figure 6.10.Flowchart of Sample Program 8................................ 52  
COM-2(PC)F  
v
Figure 6.11.Flowchart of Sample Program 9................................ 53  
Figure 6.12.Flowchart of Sample Program10............................... 54  
Figure 6.13.Flowchart of Sample Program 11 .............................. 55  
Figure 6.14. IVR Bit Function in Enhanced Mode........................ 61  
Figure 6.15.Difference in Jumpers (JP1~JP3)............................... 64  
vi  
COM-2(PC)F  
List of Tables  
Table 2.1. COM Port Support for Various Programming  
Languages................................................................. 21  
Table 3.1. I/O Address Settings ................................................. 25  
Table 3.2. Example Compatible Mode Settings ......................... 27  
Table 4.1. Specifications............................................................ 33  
Table 6.1. Data Format .............................................................. 40  
Table 6.2. Switch and Jumper Settings of Sample Program 1, 2,  
and 5......................................................................... 42  
Table 6.3. Switch and Jumper Settings of Sample Program 3, 4, 6,  
and 10....................................................................... 42  
Table 6.4. Switch and Jumper Settings of Sample Program 7 .... 43  
Table 6.5. Switch and Jumper Settings of Sample Program 11... 43  
Table 6.6. Function Selection through Internal Registers........... 56  
Table 6.7. Baud Rate and Divisors............................................. 57  
Table 6.8. Number of Times the IN Instruction Must be Executed  
for the 2EFh Port after Accessing the LSI................. 58  
Table 6.9. NS16550's Register (Short from National  
Semiconductor's data book) < 1 / 2 > .................... 62  
Table 6.9. NS16550's Register (Short from National  
Semiconductor's data book) < 2 / 2 > .................... 63  
Table 6.10. Specifications Differences....................................... 64  
COM-2(PC)F  
vii  
viii  
COM-2(PC)F  
Introduction  
1. Introduction  
About the COM-2(PC)F Board  
The COM-2(PC)F is an IBM PC/AT ISA-Bus add-on interface  
board for multi-channel RS-232C asynchronous communications.  
It features two serial communication ports and a programmable  
communication rate ranging from 50 to 115,200 bps for  
communication or modem control.  
Support Software of Option  
- For Windows  
- For Windows 3.1  
- For MS-DOS  
API-PAC(W32)  
API-SIO(PC)WIN  
SUPPORT-PAC(PC)103  
Features  
- 2-channel asynchronous communication  
- Supports RS-232C protocol  
- Programmable communication rate from 50 to 115,200 bits per  
second  
- Two operational modes : Enhanced and Compatible  
(COM1, COM2, COM3, and COM4)  
For more information, see System Reference.  
COM-2(PC)F  
1
Introduction  
Limited Three-Year Warranty  
CONTEC Interface boards are warranted by CONTEC Co., LTD to  
be free from defects in material and workmanship for up to three  
years from the date of purchase by the original purchaser.  
Repair will be free of charge only when this device is returned  
freight prepaid with a copy of the original invoice and a Return  
Merchandise Authorization to the distributor or the CONTEC group  
office, from which it was purchased.  
This warranty is not applicable for scratches or normal wear, but  
only for the electronic circuitry and original boards. The warranty  
is not applicable if the device has been tampered with or damaged  
through abuse, mistreatment, neglect, or unreasonable use, or if the  
original invoice is not included, in which case repairs will be  
considered beyond the warranty policy.  
How to Obtain Service  
For replacement or repair, return the device freight prepaid, with a  
copy of the original invoice. Please obtain a Return Merchandise  
Authorization Number (RMA) from the CONTEC group office  
where you purchased before returning any product.  
*No product will be accepted by CONTEC group without the  
RMA number.  
Liability  
The obligation of the warrantor is solely to repair or replace the product.  
In no event will the warrantor be liable for any incidental or  
consequential damages due to such defect or consequences that arise  
from inexperienced usage, misuse, or malfunction of this device.  
2
COM-2(PC)F  
Introduction  
About the Manual  
This manual consists of the following chapters :  
Chapter 1 Introduction  
Chapter 2 How to Use the Board  
Chapter 3 Hardware Setup  
Chapter 4 I/O Ports and Registers  
Chapter 5 System Reference  
Chapter 6 Troubleshooting  
Chapter 7 Index  
COM-2(PC)F  
3
Introduction  
4
COM-2(PC)F  
How to Use the Board  
2. How to Use the Board  
Compatible Mode and Enhanced Mode  
The COM-2(PC)F supports Compatible mode and Enhanced mode.  
In Compatible mode, the board channels operate as standard PC  
serial ports. In Enhanced mode, the board operates under  
CONTEC's proprietary control procedures. Give full  
consideration to the features of each mode when selecting which  
mode to use in your system.  
Compatible Mode  
The two channels of the COM-2(PC)F can be used as standard PC  
serial ports. Channel CN1 of the COM-2(PC)F can be assigned as  
COM1 or COM3, and channel CN2 can be assigned as COM2 or  
COM4.  
In Compatible mode, each channel uses one interrupt level.  
Therefore, your PC must have at least two interrupt levels available.  
The COM-2(PC)F uses the I/O addresses assigned to the standard  
serial ports.  
As the COM-2(PC)F channels operate as standard serial ports, the  
board can be accessed using either the CONTEC driver software  
(purchased separately) or some other driver software that supports  
standard serial ports.  
Enhanced Mode  
The COM-2(PC)F operates under CONTEC's proprietary control  
procedures.  
In Enhanced mode, a single interrupt level is used to control both  
channels. Therefore, the board can be used even if your PC has  
only one free interrupt level available. The I/O address used is  
specified by CONTEC.  
As the board operates under CONTEC's proprietary control  
procedures, you must use the CONTEC driver software (purchased  
separately) or develop your own driver software. Programming  
for Enhanced mode is different to programming for Compatible  
mode.  
COM-2(PC)F  
5
How to Use the Board  
Operating under Windows Me/98  
This section describes the procedure for using the board under  
Windows Me/98 and lists a number of points to note.  
Procedure  
When using the board under Windows Me/98, the OS must be set to  
recognize the I/O address and interrupt level used by the  
COM-2(PC)F. In Windows Me/98, this is called hardware  
installation. Use the following installation procedure.  
Check the Current Settings  
First, check the current settings. Check which interrupt levels are  
available. If using in Compatible mode, also check which COM  
ports (COM1 to COM4) are already set. The COM-2(PC)F cannot  
be assigned to a COM port that is already set. The procedure for  
checking is as follows.  
- Check the interrupt level  
1. Select [System] from [Control Panel] and open [Device  
Manager].  
2. Select the [Computer] folder and click [Properties].  
3. Display the [Interrupt request(IRQ)] list and check which  
interrupt levels are available.  
- Check the ports  
1. Select [System] from [Control Panel] and open [Device  
Manager].  
2. Double click on the [Ports (COM & LPT)], [Infrared], [Modem]  
folder and check which ports are already set.  
6
COM-2(PC)F  
How to Use the Board  
Compatible Mode Installation Procedure 1  
1. Set the operation mode (I/O address) and interrupt level for the  
COM-2(PC)F. Set the COM-2(PC)F switch and jumpers as  
described in Hardware Setup. Set an interrupt level that is not  
currently used by the computer.  
2. Insert the COM-2(PC)F in an expansion slot and turn on the  
power to the PC.  
3. After Windows Me/98 starts, select [Control Panel] from  
[My Computer] and start the [Add New Hardware].  
4. Click [Next >] in response to [To begin installing your new  
hardware, click Next] in the Add New Hardware Wizard.  
5. Select [Yes (Recommended)] in response to [Do you want  
Windows to search for your new hardware ?].  
6. After following the instructions and completing detection, use  
[Details...] to check that the standard serial ports have been  
detected.  
7. Next, click [Finish] and restart your computer.  
(When Windows Me is used, it doesn’t need to restart.)  
8. After rebooting, use the procedure described in the "Check  
Resources" section below to check the interrupt level assigned  
to the COM-2(PC)F. If the value is different to the level set on  
the jumper, correct the setting in the OS.  
9. When installing by this method, the COM-2(PC)F channels are  
installed as standard serial ports (COM*).  
COM-2(PC)F  
7
How to Use the Board  
Compatible Mode Installation Procedure 2  
1. Turn on the power to the PC without inserting the COM-2(PC)F  
in an expansion slot.  
2. After Windows Me/98 starts, select [Control Panel] from [My  
Computer] and start the [Add New Hardware].  
3. Click [Next >] in response to [To begin installing your new  
hardware, click Next] in the Add New Hardware Wizard.  
4. Select [No] in response to [Do you want Windows to search for  
your new hardware ?].  
5. Select the [Ports (COM & LPT)] folder from the [Hardware  
types:] screen.  
6. Select [Communication Port] from [Models:] and click on [Have  
Disk...] in the screen.  
7. When the [Install From Disk] screen appears, place the floppy  
disk in the drive, enter the drive name in [Copy manufacturer's  
file from:], then click [OK].  
8. The next screen displays the board type. Select [CONTEC Co.,  
Ltd. - COM-2(PC)F, V, H Compatible] from [Models:].  
9. Next, the resource items and settings are displayed. Take a  
note of the displayed I/O address and interrupt level.  
10. End the operation as instructed. This completes the installation  
of one port. When using both ports in Compatible mode,  
repeat the procedure from step 2. If the interrupt level used by  
a COM-2(PC)F port is already used on the PC, change the  
interrupt level to an available level.  
11. Turn off the power, then set the operation mode (I/O address)  
and interrupt level on the COM-2(PC)F to the values set in steps  
9 and 10 above. Set the COM-2(PC)F switch and jumpers as  
described in Hardware Setup.  
8
COM-2(PC)F  
How to Use the Board  
Enhanced Mode Installation Procedure  
When it is used with Enhanced Mode, API-PAC(W32) of the option  
is necessary. Refer to Help "HWINSTE.HLP" of the way of  
registering the hardware being attached to API-PAC(W32) for the  
way of installing it.  
Check Resources  
Always check the PC resources (I/O address and interrupt level)  
assigned to the COM-2(PC)F before actually using the board. Use  
the following procedure to check the resources managed by the OS.  
1. Select [System] from [Control Panel] and click [Hardware]  
property sheet, then open [Device Manager].  
2. For Compatible mode, double click on the [Ports (COM &  
LPT)] folder. For Enhanced mode, double click on the  
[Multi-function adapters] folder.  
3. Double click on the [CONTEC Co., Ltd. - COM-2(PC)F] or  
[COM*] folder to display the properties screen.  
4. Select [Resources]. Check the resource items and settings, and  
look for any conflicts.  
5. Disable [Use automatic settings] first if changing the settings.  
If changing an I/O address, change the Basic configuration from  
the [Setting based on:]. To change an interrupt level, click on  
[Change setting...]. After checking the resources, check again  
that the interrupt level value on the COM-2(PC)F board match  
the settings in the OS.  
COM-2(PC)F  
9
How to Use the Board  
Operating under Windows 95  
This section describes the procedure for using the board under  
Windows 95 and lists a number of points to note.  
Procedure  
When using the board under Windows 95, the OS must be set to  
recognize the I/O address and interrupt level used by the  
COM-2(PC)F. In Windows 95, this is called hardware installation.  
Use the following installation procedure.  
Check the Current Settings  
First, check the current settings. Check which interrupt levels are  
available. If using in Compatible mode, also check which COM  
ports (COM1 to COM4) are already set. The COM-2(PC)F cannot  
be assigned to a COM port that is already set. The procedure for  
checking is as follows.  
- Check the interrupt level  
1. Select [System] from [Control Panel] and open [Device  
Manager].  
2. Select the [Computer] folder and click [Properties].  
3. Display the [Interrupt request(IRQ)] list and check which  
interrupt levels are available.  
- Check the ports  
1. Select [System] from [Control Panel] and open [Device  
Manager].  
2. Double click on the [Ports (COM & LPT)] folder and check  
which ports are already set.  
10  
COM-2(PC)F  
How to Use the Board  
Compatible Mode Installation Procedure 1  
1. Set the operation mode (I/O address) and interrupt level for the  
COM-2(PC)F. Set the COM-2(PC)F switch and jumpers as  
described in Hardware Setup. Set an interrupt level that is not  
currently used by the computer.  
2. Insert the COM-2(PC)F in an expansion slot and turn on the  
power to the PC.  
3. After Windows 95 starts, select [Control Panel] from  
[My Computer] and start the [Add New Hardware].  
4. Click [Next >] in response to [To begin installing your new  
hardware, click Next] in the Add New Hardware Wizard.  
5. Select [Yes (Recommended)] in response to [Do you want  
Windows to search for your new hardware ?].  
6. After following the instructions and completing detection, use  
[Details...] to check that the standard serial ports have been  
detected.  
7. Next, click [Finish] and restart your computer.  
8. After rebooting, use the procedure described in the "Check  
Resources" section below to check the interrupt level assigned  
to the COM-2(PC)F. If the value is different to the level set on  
the jumper, correct the setting in the OS.  
9. When installing by this method, the COM-2(PC)F channels are  
installed as standard serial ports (COM*).  
COM-2(PC)F  
11  
How to Use the Board  
Compatible Mode Installation Procedure 2  
1. Turn on the power to the PC without inserting the COM-2(PC)F  
in an expansion slot.  
2. After Windows 95 starts, select [Control Panel] from [My  
Computer] and start the [Add New Hardware].  
3. Click [Next >] in response to [To begin installing your new  
hardware, click Next] in the Add New Hardware Wizard.  
4. Select [No] in response to [Do you want Windows to search for  
your new hardware ?].  
5. Select the [Ports (COM & LPT)] folder from the [Hardware  
types:] screen.  
6. Select [Communication Port] from [Models:] and click on [Have  
Disk...] in the screen.  
7. When the [Install From Disk] screen appears, place the floppy  
disk in the drive, enter the drive name in [Copy manufacturer's  
file from:], then click [OK].  
8. The next screen displays the board type. Select [CONTEC Co.,  
Ltd. - COM-2(PC)F, V, H Compatible] from [Models:].  
9. Next, the resource items and settings are displayed. Take a  
note of the displayed I/O address and interrupt level.  
10. End the operation as instructed. This completes the installation  
of one port. When using both ports in Compatible mode,  
repeat the procedure from step 2. If the interrupt level used by  
a COM-2(PC)F port is already used on the PC, change the  
interrupt level to an available level.  
11. Turn off the power, then set the operation mode (I/O address)  
and interrupt level on the COM-2(PC)F to the values set in steps  
9 and 10 above. Set the COM-2(PC)F switch and jumpers as  
described in Hardware Setup.  
12  
COM-2(PC)F  
How to Use the Board  
Enhanced Mode Installation Procedure  
When it is used with Enhanced Mode, API-PAC(W32) of the option  
is necessary. Refer to Help "HWINSTE.HLP" of the way of  
registering the hardware being attached to API-PAC(W32) for the  
way of installing it.  
Check Resources  
Always check the PC resources (I/O address and interrupt level)  
assigned to the COM-2(PC)F before actually using the board. Use  
the following procedure to check the resources managed by the OS.  
1. Select [System] from [Control Panel] and open [Device  
Manager].  
2. For Compatible mode, double click on the [Ports (COM &  
LPT)] folder. For Enhanced mode, double click on the  
[Multi-function adapters] folder.  
3. Double click on the [CONTEC Co., Ltd. - COM-2(PC)F] or  
[COM*] folder to display the properties screen.  
4. Select [Resources]. Check the resource items and settings, and  
look for any conflicts.  
5. Disable [Use automatic settings] first if changing the settings.  
If changing an I/O address, change the Basic configuration from  
the [Setting based on:]. To change an interrupt level, click on  
[Change setting...]. After checking the resources, check again  
that the interrupt level value on the COM-2(PC)F board match  
the settings in the OS.  
COM-2(PC)F  
13  
How to Use the Board  
Operating under Windows 2000  
This section describes the procedure for using the board under  
Windows 2000 and lists a number of points to note.  
Procedure  
When using the board under Windows 2000, the OS must be set to  
recognize the I/O address and interrupt level used by the  
COM-2(PC)F. In Windows 2000, this is called hardware  
installation. Use the following installation procedure.  
Check the Current Settings  
First, check the current settings. Check which interrupt levels are  
available. If using in Compatible mode, also check which COM  
ports (COM1 to COM4) are already set. The COM-2(PC)F cannot  
be assigned to a COM port that is already set. The procedure for  
checking is as follows.  
- Check the interrupt level  
1. Select [System] from [Control Panel] and click [Hardware]  
property sheet, then open [Device Manager].  
2. Select the [View] and click [Resource by type].  
3. Display the [Interrupt request(IRQ)] list and check which  
interrupt levels are available.  
- Check the ports  
1. Select [System] from [Control Panel] and click [Hardware]  
property sheet, then open [Device Manager].  
2. Double click on the [Ports (COM & LPT)] [Infrared], [Modem]  
folder and check which ports are already set.  
14  
COM-2(PC)F  
How to Use the Board  
Compatible Mode Installation Procedure 1  
It can’t be used with Compatible Mode when API-SIO(98/PC)NT  
of packing together is used for API-PAC(W32).  
1. Set the operation mode (I/O address) and interrupt level for the  
COM-2(PC)F. Set the COM-2(PC)F switch and jumpers as  
described in Hardware Setup. Set an interrupt level that is not  
currently used by the computer.  
2. Insert the COM-2(PC)F in an expansion slot and turn on the  
power to the PC.  
3. After Windows 2000 starts, select [Control Panel] from  
[My Computer] and start the [Add/Remove Hardware].  
4. Click [Next >] in response to [Welcome to the Add/Remove  
Hardware Wizard] in the Add/Remove Hardware Wizard.  
5. Select [Add/Troubleshoot a device] in response to [Choose a  
Hardware Task].  
6. The next, select [Add a New Device] and click [Next].  
7. Select [Yes] in response to [Do you want Windows to search for  
your new hardware ?], and click [Next].  
8. It confirms that two [Install Communications Port] sentences are  
indicated on the [Detected Hardware], and click [Next].  
9. After rebooting, use the procedure described in the "Check  
Resources" section below to check the interrupt level assigned  
to the COM-2(PC)F. If the value is different to the level set on  
the jumper, correct the setting in the OS.  
10. When installing by this method, the COM-2(PC)F channels are  
installed as standard serial ports (COM*).  
COM-2(PC)F  
15  
How to Use the Board  
Compatible Mode Installation Procedure 2  
It can’t be used with Compatible Mode when API-SIO(98/PC)NT  
of packing together is used for API-PAC(W32).  
1. Turn on the power to the PC without inserting the COM-2(PC)F  
in an expansion slot.  
2. After Windows 2000 starts, select [Control Panel] from [My  
Computer] and start the [Add/Remove Hardware].  
3. Click [Next >] in response to [Welcome to the Add/Remove  
Hardware Wizard] in the Add/Remove Hardware Wizard.  
4. Select [Add/Troubleshoot a device] in response to [Choose a  
Hardware Task].  
5. The next, select [Add a New Device] and click [Next].  
6. Select [No] in response to [Do you want Windows to search for  
your new hardware ?], and click [Next].  
7. Select the [Ports (COM & LPT)] folder from the [Hardware  
types:] screen.  
8. Click [Hard Disk], and the [Install From Disk] screen appears,  
place the floppy disk in the drive, enter the drive name in [Copy  
manufacturer's file from:], then click [OK].  
9. The next screen displays the board type. Select [CONTEC Co.,  
Ltd. - COM-2(PC)F, V, H Compatible] from [Models:].  
10. Next, the resource items and settings are displayed. Take a  
note of the displayed I/O address and interrupt level.  
11. End the operation as instructed. This completes the installation  
of one port. When using both ports in Compatible mode,  
repeat the procedure from step 2. If the interrupt level used by  
a COM-2(PC)F port is already used on the PC, change the  
interrupt level to an available level.  
12. Turn off the power, then set the operation mode (I/O address)  
and interrupt level on the COM-2(PC)F to the values set in steps  
10 and 11 above. Set the COM-2(PC)F switch and jumpers as  
described in Hardware Setup.  
16  
COM-2(PC)F  
How to Use the Board  
Enhanced Mode Installation Procedure  
When it is used with Enhanced Mode, API-PAC(W32) of the option  
is necessary. Refer to Help "HWINSTE.HLP" of the way of  
registering the hardware being attached to API-PAC(W32) for the  
way of installing it.  
Check Resources  
Always check the PC resources (I/O address and interrupt level)  
assigned to the COM-2(PC)F before actually using the board. Use  
the following procedure to check the resources managed by the OS.  
1. Select [System] from [Control Panel] and click [Hardware]  
property sheet, then open [Device Manager].  
2. For Compatible mode, double click on the [Ports (COM &  
LPT)] folder. For Enhanced mode, double click on the  
[Multi-function adapters] folder.  
3. Double click on the [CONTEC Co., Ltd. - COM-2(PC)F] or  
[COM*] folder to display the properties screen.  
4. Select [Resources]. Check the resource items and settings, and  
look for any conflicts.  
5. Disable [Use automatic settings] first if changing the settings.  
If changing an I/O address, change the Basic configuration from  
the [Setting based on:]. To change an interrupt level, click on  
[Change setting...]. After checking the resources, check again  
that the interrupt level value on the COM-2(PC)F board match  
the settings in the OS.  
COM-2(PC)F  
17  
How to Use the Board  
Operating under Windows NT  
This section describes the procedure for using the board under  
Windows NT and lists a number of points to note.  
Procedure  
First, set the operation mode (I/O address) and interrupt level for  
the COM-2(PC)F. Set the COM-2(PC)F switch and jumpers as  
described in Hardware Setup.  
When using the board in compatible mode, the OS must be set to  
recognize the I/O address and interrupt level used by the  
COM-2(PC)F. Use the Ports icon in Control Panel to set the I/O  
address and interrupt level.  
The I/O address and interrupt level used by the COM-2(PC)F do not  
need to be set for the OS when using the board in enhanced mode.  
18  
COM-2(PC)F  
How to Use the Board  
Operating under Windows 3.1  
This section describes the procedure for using the board under  
Windows 3.1 and lists a number of points to note.  
Procedure  
First, set the operation mode (I/O address) and interrupt level for  
the COM-2(PC)F. Set the COM-2(PC)F switch and jumpers as  
described in Hardware Setup.  
When using the board in Compatible mode, the OS must be set to  
recognize the I/O address and interrupt level used by the  
COM-2(PC)F. Use the Ports icon in Control Panel to set the I/O  
address and interrupt level.  
The I/O address and interrupt level used by the COM-2(PC)F do not  
need to be set for the OS when using the board in Enhanced mode.  
COM-2(PC)F  
19  
How to Use the Board  
Operating under MS-DOS  
This section describes the procedure for using the board under  
MS-DOS and lists a number of points to note.  
Procedure  
First, set the operation mode (I/O address) and interrupt level for  
the COM-2(PC)F. Set the COM-2(PC)F switch and jumpers as  
described in Hardware Setup.  
When using the board in Compatible mode, the system area of the  
PC must be set to recognize the I/O address used by the  
COM-2(PC)F. If a system configuration program or the  
MODE.COM command is available on the PC, use the program to  
set the I/O addresses for the standard serial ports. If neither a  
system configuration program nor the MODE.COM command is  
available, use the SETCOM.EXE program provided on the floppy  
disk to set the I/O addresses for the standard serial ports as shown  
below. Set the I/O address to "NONE" for unused serial ports.  
C>SETCOM  
[COM1 I/O address] [COM2 I/O address]  
[COM3 I/O address] [COM4 I/O address]  
Example:  
C>SETCOM 3F8 2F8 NONE NONE  
COM-2(PC) series compatible mode setting software by CONTEC  
I/O address data: COM1:[3F8] COM2:[2F8] COM3:[NONE] COM4:[NONE]  
C>  
The I/O addresses used by the COM-2(PC)F do not need to be set  
for the system area of the PC when using the board in Enhanced  
mode.  
20  
COM-2(PC)F  
How to Use the Board  
Note!  
When used in Compatible mode, COM3 and COM4 are not  
supported by some programming languages. Check the  
specifications of the language you are using. Table 2.1. lists the  
COM ports supported by a number of common programming  
languages.  
Table 2.1. COM Port Support for Various Programming  
Languages  
Language  
Microsoft C  
Quick BASIC  
GW-BASIC  
Turbo Pascal  
COM1  
COM2  
COM3  
COM4  
O
O
O
O
O
O
O
O
O
×
O
×
×
×
O
O
If writing your own driver software, see "Appendix B : Notes on  
Developing Driver Software".  
COM-2(PC)F  
21  
How to Use the Board  
22  
COM-2(PC)F  
Hardware Setup  
3. Hardware Setup  
Names of Board Components  
Figure 3.1. shows the names of various board components.  
The switch and jumper settings shown in the figure are the default  
factory settings.  
Figure 3.1. Names of Board Components and Default  
Factory Settings  
COM-2(PC)F  
23  
Hardware Setup  
I/O Address Setting  
The board is an I/O device controlled by I/O instructions from the  
PC. I/O devices include expansion boards and devices inside the  
PC. The various devices are identified by their I/O addresses.  
I/O addresses are represented as four digit hexadecimal values  
(e.g. 02A0H) and act as the ID number for each I/O device.  
Most expansion boards are controlled via a range of consecutive I/O  
addresses. The address of the first I/O address in the range is  
called the base I/O address.  
When using Enhanced mode, either 1A0H or 2A0H is selected as  
the base I/O address. In Compatible mode, the fixed address for  
the PC system is used.  
Notes!  
1. When using more than one expansion board, set each board so  
that their I/O addresses do not overlap.  
2. If the PC already has COM1 to COM4 ports, those ports cannot  
be set for the board.  
24  
COM-2(PC)F  
Hardware Setup  
Setting Procedure  
The I/O address is set using a DIP switch (SW1) on the board.  
SW1  
MODE  
1
3
2
4
Figure 3.2. I/O Address DIP Switch  
Table 3.1. I/O Address Settings  
SW1  
Interrupt Vector  
Function  
I/O Address  
Bit 1  
ON  
Bit 2  
ON  
Register Address  
Enhanced  
Enhanced  
COM3  
1A0~1A7  
2A0~2A7  
3E8~3EF  
3F8~3FF  
1BF  
2BF  
---  
C
N
1
OFF  
ON  
OFF  
OFF  
COM1  
---  
SW1  
Interrupt Vector  
Function  
I/O Address  
Bit 3  
ON  
Bit 4  
ON  
Register Address  
Enhanced  
Enhanced  
COM4  
1A8~1AF  
2A8~2AF  
2E8~2EF  
2F8~2FF  
1BF  
2BF  
---  
C
N
2
OFF  
ON  
OFF  
OFF  
COM2  
---  
Figure 3.2 shows the CN1 bace I/O address set to 2A0H and the  
CN2 bace I/O address set to 2A8H.  
COM-2(PC)F  
25  
Hardware Setup  
Interrupt Level Setting  
The signal from the LSI (NS16550 equivalent) on the board can be  
used as an interrupt request signal based on the JP1, JP2, and JP3  
settings.  
Note!  
When using interrupts, set an interrupt level that is not used by any  
other device.  
Setting Procedure  
When not Using Interrupts  
Place a short connector on the NC pin of each jumper (JP1, JP2, and  
JP3).  
When Using Interrupts  
Connect the interrupt level using the short connector on each  
jumper (JP1, JP2, and JP3). Available interrupt levels are IRQ3 to  
7, 9 to 12, 14, and 15.  
JP1  
Enhanced  
15  
15  
15  
3
3
3
4
4
4
5
5
5
7 10 11  
1214  
6
6
NC  
NC  
9
9
JP2  
COM CN1  
7 10 111214  
JP3  
COM CN2  
7 10 111214  
6
NC  
9
Figure 3.3. Interrupt Level Settings  
If SW1 selects Enhanced mode, the settings in Figure 3.3. specify  
that CN1 and CN2 both use IRQ5. If Compatible mode is set, the  
settings specify that CN1 uses IRQ4 and CN2 uses IRQ3.  
Note!  
Jumper of the mode which isn’t used is to connect a short connector  
to the NC pin.  
26  
COM-2(PC)F  
Hardware Setup  
Table 3.2. lists the I/O address and standard interrupt level settings  
for COM1 to COM4 (Compatible mode).  
Table 3.2. Example Compatible Mode Settings  
Interrupt Level  
Port  
I/O Address  
3F8~3FF  
2F8~2FF  
3E8~3EF  
2E8~2EF  
COM1  
COM2  
COM3  
COM4  
IRQ4  
IRQ3  
IRQ4  
IRQ3  
*1 *1 On the IBM PS/55Z and similar,  
COM3 uses IRQ3.  
Note!  
If using the PC's RS-232C ports as COM 1 and COM 2 at the same  
time as using the CONTEC board as COM3 and COM4, COM3 and  
COM4 must be set to interrupt levels other than IRQ3 and IRQ4  
because COM1 uses IRQ4 and COM2 uses IRQ3.  
COM-2(PC)F  
27  
Hardware Setup  
Mounting Method  
There are many kinds of boards that can be mounted in a computer's  
extension slots, however the mounting method is identical for any  
slot.  
Before starting  
(1) Set the Power switch to OFF.  
(2) Unplug the power cable from the AC outlet.  
Mounting the board  
(1) Remove the screws from the rear of the computer. When  
removing screws, use a screwdriver that matches the screw  
heads.  
Cover mounting screws  
Cover mounting screws  
Figure 3.4. Rear Panel of IBM-PC/AT  
(2) Hold the left and right sides of the front cover and remove it  
from the computer's chassis by sliding it to the front.  
Figure 3.5. Removing the Cover  
28  
COM-2(PC)F  
Hardware Setup  
(3) Remove the screw retaining the cover of the slot where the  
board is to be mounted, and remove the cover from the rear  
panel.  
Figure 3.6. Expansion Slot Cover  
Caution!  
To prevent a discharge of static electricity from damaging the board,  
it is important to ground yourself. Hold the packaged board in  
one hand and touch an unpainted, grounded metal surface with the  
other hand. Then, hold the non-conductive part of the board and  
remove it from the bag. Don't touch the underside side of the  
board with the exposed pins and solder. Place the board on a  
clean, non-conductive surface.  
(4) Remove the board from the anti-static packaging.  
(5) Inspect the board. Check the board for any visible damage or  
loose parts. If you notice any problems with the board,  
contact CONTEC. Don't attempt to fix the board yourself.  
CONTEC does not warranty boards damaged or worked-on by  
the customers.  
(6) Insert the board into the expansion slot and press in firmly.  
Make sure the board is fully seated in the support bracket.  
COM-2(PC)F  
29  
Hardware Setup  
(7) Anchor the board with the screw. Use the screw set aside in  
step 3. Tighten so that the board is held in place.  
Figure 3.7. Anchoring the COM-2(PC)F  
(8) Replace the computer cover.  
(9) Connect the power cord.  
30  
COM-2(PC)F  
Hardware Setup  
Connecting the External Devices  
Connecting the COM-2(PC)F board to external devices is via two  
9-pin D-SUB connector (male) on the board.  
5
9
6
9
6
CN1  
1
5
CN2  
1
On-board Connector : DELC-J9PAF-20L9 (Male)  
[mfd. by JAE]  
Application Connector : 17JE-13090-02 (D8C) (Female) [mfd. by DDK]  
Figure 3.8. Interface Connectors (CN1 and CN2)  
(Signal Ground) SG  
(Data Terminal Ready) DTR  
(Transmit Data) TXD  
5
4
3
2
1
9
8
7
6
RI (Ring Indicator)  
CTS (Clear to Send)  
RTS (Request to Send)  
DSR (Data Set Ready)  
(Receive Data) RXD  
(Data Carrier Detect) DCD  
CN1/CN2  
Figure 3.9. CN1 and CN2 Pin Assignments  
COM-2(PC)F  
31  
Hardware Setup  
Connecting the Cable  
The RS-232C interface requires that you use a different type of  
cable depending on the type of device being connected. For  
example, modem connections and computer (PC) connections  
require different cables. Accordingly, check the specifications of  
the external device to which you are connecting and select the  
appropriate type of cable. The two types of cable are "straight-  
through" and "crossed". Also, if the signal lines require  
conditioning in the connector, provide conditioning in accordance  
with the specifications.  
(Transmit Data)  
(Receive Data)  
TXD  
TXD  
RXD  
RTS  
RXD  
RTS  
(Request to Send)  
(Clear to Send)  
CTS  
DTR  
DSR  
CTS  
DTR  
(Data Terminal Ready)  
DSR (Data Set Ready)  
(Signal Ground)  
External Device  
SG  
SG  
Board  
Figure 3.10. Example Connection to a Modem  
TXD  
RXD  
TXD  
RXD  
RTS  
CTS  
RTS  
CTS  
DTR  
DSR  
SG  
DTR  
DSR  
SG  
External Device  
Board  
Figure 3.11. Example Connection to a PC  
TXD  
TXD  
RXD  
RTS  
RXD  
RTS  
CTS  
DTR  
DSR  
CTS  
DTR  
DSR  
SG  
SG  
Board  
External Device  
Figure 3.12. Example Connection to a Device  
32  
COM-2(PC)F  
System Reference  
4. System Reference  
Specifications  
Table 4.1. Specifications  
Item  
Specification  
Number of Channels  
Input Type  
2
RS-232C  
External connectors  
Transfer Method  
Baud Rate  
Two 9-pin D-SUB connector (Male)  
Asychronous serial transfer  
50~115,200bps *1  
5, 6, 7, 8 bits  
Data Length  
1, 1.5, 2 stop bits *1  
Even, Odd, Non-parity *1  
NS16550 or equivalent  
15m Max.  
Parity heck  
Controller Chip  
Distance  
Enhanced mode : 1 level  
Compatible mode : 2 levels  
8 bits x 16 ports  
Interrupt Requests  
I/O Address  
+5VDC, 420mA Max.  
+12VDC, 60mA Max.  
-12VDC, 50mA Max.  
Power Consumption  
Operating Temperature 0~50°C  
Storage Temperature  
Relative Humidity  
-20~60°C  
20~90% non-condensing  
160.0 x 107.0 x 18.5mm  
(6.3inch x 4.2inch x 0.7inch)  
130g  
Dimensions  
Weight  
*1 : Software programmable.  
For details, see "Appendix B Notes on Developing Driver Software" or refer to  
the data sheet of the NS16550 or the equivalent chip.  
Board Dimensions  
160.0  
[mm]  
COM-2(PC)F  
33  
System Reference  
Circuitry Diagrams  
SN75188  
TXD, RTS, DTR  
SN75189  
RXD, CTS, DSR  
15pF  
Figure 4.1. Circuitry Diagrams  
Block Diagram  
The following is a block diagram of the COM-2(PC)F interface  
board.  
Addr. Bus  
(A9~A3)  
AEN  
ADDRESS  
DECODER  
CLOCK  
Addr. Bus  
(A2~A0)  
IOR  
IOW  
RESET  
CNTROL  
BUFFER  
CN1  
RS-232C  
DRIVER &  
RECEIVER  
NS16550  
NS16550  
Serial Port  
Data Bus  
(D7~D0)  
DATA  
BUFFER  
RS-232C  
DRIVER &  
RECEIVER  
CN2  
Serial Port  
INTERRUPT  
VECTOR  
REGISTER  
IRQ3~7,  
IRQ9~12,  
IRQ14, 15  
INTERRUPT  
JUMPER  
COM-2(PC)F  
Figure 4.2. COM-2(PC)F Block Diagram  
34  
COM-2(PC)F  
Troubleshooting  
5. Troubleshooting  
If you are having trouble with your board or program, answer the  
following questions to see if you can find the problem.  
QUESTIONS:  
STEPS TO TAKE  
Is the pilot light on?  
The system must be turned on and the power supply must be  
working. Check the main power switch and the power supply.  
Did the system boot up?  
If the board has been installed and the system did not boot, check  
the following:  
- Make sure the board has been inserted firmly. Pull it out and try  
to reboot. If your system reboots, then re-insert the board and  
try to boot again.  
- Check that cables attached to your other boards fit tightly.  
Does your program work?  
If the system booted and your program does not work, check the  
following:  
- DIP switches have been set correctly for the desired base address.  
- Selected base address doesn't conflict with another peripheral  
device or card installed in the computer.  
- Selected interrupt levels don't conflict with interrupts required by  
other devices or cards.  
- Try one of the sample programs provided on the disk and see if it  
works.  
COM-2(PC)F  
35  
Troubleshooting  
Does the sample program work?  
Check the following:  
- Signals are connected to the correct pins.  
- Pin connections on the I/O cables are secure.  
- Signals are present at the external connectors.  
- Try using the COM-2(PC)F board with other non-essential boards  
removed. Remove other boards one by one, checking the  
COM-2(PC)F for successful operation after each board is  
removed.  
Is the input data accurate?  
If you believe something is wrong with either the input data or the  
output data, check the following:  
- Environmental noise. Move the equipment and cables away  
from sources of electrical noise. Try an isolated power source.  
- Dirty connector edge. Clean the edge.  
- External connectors fit tightly. Separate and reattach external  
cables.  
Still have a probrem?  
Contact CONTEC group office where you purchased as shown in  
the last page of this manual.  
Note!  
Before you call, make a list of the following information. Our  
technical representatives will need the following information to help  
you.  
1. Your name, company, and phone number.  
2. The brand and type of computer you are using (e.g. IBM-AT,  
Compaq 386).  
36  
COM-2(PC)F  
Troubleshooting  
3. DOS Version.  
4. Name of the CONTEC board that you are using.  
5. Names of other boards in the computer.  
6. I/O addresses for the CONTEC board and all other boards.  
7. Interrupt levels for the CONTEC board and all other boards.  
8. DMA channels for the CONTEC board and all other boards  
(if applicable).  
9. The programming language that you are using  
(and the version number).  
COM-2(PC)F  
37  
Troubleshooting  
10. Different I/O addresses you have tried.  
11. Are you using your own program or a CONTEC sample  
program.  
12. List AUTOEXEC.BAT.  
13. List CONFIG.SYS.  
38  
COM-2(PC)F  
Appendix  
6. Appendix  
A. Sample Programs (for MS-DOS)  
This section covers the sample programs that are supplied on the  
floppy disk included with this board.  
COM-2(PC)F Diskette  
CONTEC supplies a sample program diskette with each  
COM-2(PC)F board. This diskette contains sample programs to  
help you get started.  
Use the DOS DIR command to see a list of files on the  
COM-2(PC)F diskette.  
A> dir  
Backup Copy  
Make a backup of the COM-2(PC)F diskette before use. This will  
protect you if the original copy becomes damaged or destroyed.  
Use the DOS DISKCOPY command.  
A> diskcopy a: b:  
Keep the original in a safe place and use the backup copy for the  
following procedures.  
Copy Files to Hard Disk  
If a hard disk drive is available on your PC, then installing and  
executing the sample programs from the hard disk drive will be  
faster than using a floppy drive. To run sample programs from the  
hard drive, create a subdirectory named COM2F on your C drive  
and copy the files from A: to C: with the following commands.  
A:> c:  
C:> md com2f  
C:> xcopy A:¥*.* c:¥com2f /s  
COM-2(PC)F  
39  
Appendix  
Sample Programs  
The programs are written in GW-BASIC and Microsoft C.  
The sample programs transmit data entered from the keyboard and  
display received data on the screen. Table 6.1. lists the  
communications data format.  
The sample programs listed in Figure 6.1. are included on the  
floppy disk.  
Table 6.1. Data Format  
Parameter  
Data bits  
Stop bits  
Parity  
Data Format  
8 bits  
2 bits  
None  
BAS  
(1) H103HD01.BAS Data transmission (Enhanced mode)  
(2) H103HD02.BAS Data reception (Enhanced mode)  
(3) H103HD03.BAS Data transmission (COM1 mode)  
(4) H103HD04.BAS Data reception (COM1 mode)  
(5) H103HD05.BAS Data transmission and reception (Enhanced mode)  
(6) H103HD06.BAS Data transmission and reception (COM1, COM2 mode)  
(7) H103HD07.BAS Interrupt-driven data transmission and reception  
H103HD.ASM  
H103HD.BIN  
(8) H103HD08.BAS Half-duplex data transmission (Enhanced mode)  
(9) H103HD09.BAS Half-duplex data reception (Enhanced mode)  
(10)COM21_1.C  
COM21_1.EXE  
Data transmission and reception (COM1, COM2 mode)  
Data transmission and reception (COM3, COM4 mode)  
(Address setting file for Compatible mode)  
MSC  
(11)COM34_1.C  
COM34_1.EXE  
COM2V  
SETCOM.EXE  
Figure 6.1. Floppy Disk Files  
40  
COM-2(PC)F  
Appendix  
Notes!  
- All the sample programs must be run on a PC operating under  
MS-DOS.  
- Sample programs 3, 4, 6, and 10 cannot be used on a PC that  
already has COM1 and COM2 ports. Similarly, sample  
programs 11 cannot be used on a PC that already has COM3 and  
COM4 ports.  
- As sample programs 8 and 9 use half-duplex mode, they can only  
be used with the COM-2PD(PC) board.  
COM-2(PC)F  
41  
Appendix  
Switch and Jumper Settings  
Table 6.2. Switch and Jumper Settings of Sample Program 1,  
2, and 5  
Item  
Settings  
SW1  
I/O Address  
(SW1)  
Interrupt Level  
(JP1, JP2, JP3)  
JP1  
JP2  
JP3  
9
9
9
3
3
3
4
4
4
5
5
5
6
6
6
7 10 1112 14 15 NC  
7 10 1112 14 15 NC  
7 10 1112 14 15 NC  
Table 6.3. Switch and Jumper Settings of Sample Program 3,  
4, 6, and 10  
Item  
Settings  
SW1  
I/O Address  
(SW1)  
Interrupt Level  
(JP1, JP2, JP3)  
JP1  
JP2  
JP3  
9
9
9
3
3
3
4
4
4
5
5
5
6
6
6
7 10 1112 14 15NC  
7 10 1112 14 15NC  
7 10 1112 14 15NC  
42  
COM-2(PC)F  
Appendix  
Table 6.4. Switch and Jumper Settings of Sample Program 7  
Item  
Settings  
SW1  
I/O Address  
(SW1)  
Interrupt Level  
(JP1, JP2, JP3)  
JP1  
JP2  
JP3  
9
9
3
3
4
4
5
5
6
6
7 10 1112 14 15 NC  
7 10 1112 14 15 NC  
7 10 1112 14 15 NC  
9
3
4
5
6
Table 6.5. Switch and Jumper Settings of Sample Program 11  
Item  
Settings  
SW1  
I/O Address  
(SW1)  
Interrupt Level  
(JP1, JP2, JP3)  
JP1  
JP2  
JP3  
9
9
9
3
3
3
4
4
4
5
5
5
6
6
6
7 10 1112 14 15 NC  
7 10 1112 14 15 NC  
7 10 1112 14 15 NC  
COM-2(PC)F  
43  
Appendix  
Cable Connection  
When running the sample programs 1 to 11 (except 8 and 9), use the  
interconnection cable as shown in Figure 6.2. for connection with  
the mating device in the Compatible mode. For use in the  
Enhanced mode, on the other hand, use the cross cable or the  
interconnection configuration diagram in Figure 6.2.  
Signal  
Pin No.  
Pin No. Signal  
TXD  
RXD  
DTR  
DSR  
SG  
3
2
4
6
5
1
2
3
6
4
5
7
8
RXD  
TXD  
DSR  
DTR  
SG  
RTS  
CTS  
DCD  
RTS  
CTS  
7
8
1
DCD  
CH1  
External device or CH2  
Figure 6.2. 9-pin Connector Diagram  
44  
COM-2(PC)F  
Appendix  
Sample Program 1  
This GW-BASIC sample program demonstrates the transmit-data  
capability of COM-2(PC)F in Enhanced mode. First, it initializes  
the Asynchronous Communication Element (ACE), then it  
transmits the data input from the keyboard to the external device  
through channel 1 (CN1).  
1
START  
Read  
Set Baud Rate  
Generator  
Interrupt ID Register  
Set  
Interrupt Enable Register  
Read  
Modem Status Register  
Set Transmission Format  
(Line Control Register)  
Wait Time  
(After Initialization)  
A$=INKEY$  
1
None Key  
In Key  
Set Modem Control  
Output  
Line Status  
D5 bit = 1  
Yes  
No  
Read  
Line Status Register  
Data Transmission  
Read  
Received Data Register  
1
Data Length  
Baud Rate  
(sec)  
1
Wait Time =  
Note:  
Figure 6.3. Flowchart of Sample Program 1  
COM-2(PC)F  
45  
Appendix  
Sample Program 2  
This GW-BASIC sample program demonstrates the receive-data  
capability of COM-2(PC)F in Enhanced mode. First, it initializes  
the ACE, then it transmits the data input from the external device to  
CRT through CN1.  
START  
1
Set Baud Rate  
Generator  
Read  
Interrupt ID Register  
Set  
Interrupt Enable Register  
Read  
Modem Status Register  
Set Transmission Format  
(Line Control Register)  
Wait Time  
(After Initialization)  
Line Status  
D0 bit = 1  
1
No  
Yes  
Set Modem Control  
Output  
Display Receiver Buffer's  
Data On CRT  
Read  
Line Status Register  
Read  
Received Data Register  
1
Data Length  
Wait Time =  
(sec)  
1
Note:  
Baud Rate  
Figure 6.4. Flowchart of Sample Program 2  
46  
COM-2(PC)F  
Appendix  
Sample Program 3  
This GW-BASIC sample program demonstrates the transmit-data  
capability of COM-2(PC)F in Compatible mode. Using this  
[OPEN "COM1 : 9600, N, 8, 2, DS" AS #1] command opens the  
RS-232C communication file (COM1). It then writes the data  
input from the keyboard to COM1 through CN1.  
START  
Set  
Communication File  
A$=INKEY$  
None Key  
In Key  
Data Transmission  
Figure 6.5. Flowchart of Sample Program 3  
COM-2(PC)F  
47  
Appendix  
Sample Program 4  
This GW-BASIC sample program demonstrates the receive-data  
capability of COM-2(PC)F in Compatible mode. Using this  
[OPEN "COM1 : 9600, N, 8, 2, DS" AS #1] command opens the  
RS-232C communication file (COM1). It then reads the data from  
COM1 and outputs to CRT through CN1.  
START  
Set  
Communication File  
File Buffer = 0  
Yes  
No  
Display File Buffer's  
Data On CRT  
Figure 6.6. Flowchart of Sample Program 4  
48  
COM-2(PC)F  
Appendix  
Sample Program 5  
This GW-BASIC sample program demonstrates the  
receive/transmit-data capability of COM-2(PC)F in Enhanced mode.  
First, it initializes the ACE, it then receives the data input from the  
keyboard through CN1. Finally it outputs the data to CRT through  
CN2.  
START  
1
2
Channel 2  
Channel 1  
Set Baud Rate  
Generator  
Set Baud Rate  
Generator  
A$=INKEY$  
Set  
Set  
None Key  
No  
Interrupt Enable Register  
In Key  
Interrupt Enable Register  
Line Status  
D5 bit = 1  
Set Transmission Format  
(Line Control Register)  
Set Transmission Format  
(Line Control Register)  
Yes  
Wait Time  
(After Initialization)  
Wait Time  
(After Initialization)  
1
1
Data Transmission  
Set Modem Control  
Output  
Set Modem Control  
Output  
Line Status  
D0 bit = 1  
Read  
Read  
Line Status Register  
Line Status Register  
No  
Yes  
Read  
Read  
Received Data Register  
Received Data Register  
Display File Buffer's Data  
On CRT  
Read  
Read  
Interrupt ID Register  
Interrupt ID Register  
Read  
Read  
Modem Status Register  
Modem Status Register  
1
2
Data Length  
Baud Rate  
(sec)  
1
Wait Time =  
Note:  
Figure 6.7. Flowchart of Sample Program 5  
COM-2(PC)F  
49  
Appendix  
Sample Program 6  
This GW-BASIC sample program demonstrates the  
receive/transmit-data capability of COM-2(PC)F in Compatible  
mode. Using the [OPEN "COM1 : 9600, N, 8, 2, DS" AS #1]  
command and the [OPEN "COM2 : 9600, N, 8, 2, DS" AS #2]  
command opens two RS-232C communication files (COM1 and  
COM2). The program sends the keyboard input data from COM1  
to COM2 and displays the data received from COM2 to CRT.  
START  
Set COM1  
Set COM2  
A$=INKEY$  
None Key  
In Key  
Data Transmission  
File Buffer = 0  
Yes  
No  
Display File Buffer's Data  
On CRT  
Figure 6.8. Flowchart of Sample Program 6  
50  
COM-2(PC)F