KTI Networks TV Converter Box KSC 240 User Manual

Industrial  
RS-232 to RS-485/422 Converter  
KSC-240  
InstallationGuide  
DOC.070412-KSC-240  
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The information contained in this document is subject to change without  
prior notice. Copyright (C) All Rights Reserved.  
TRADEMARKS  
Ethernet is a registered trademark of Xerox Corp.  
FCC NOTICE  
This device complies with Class B Part 15 the FCC Rules. Operation is  
subject to the following two conditions: (1) This device may not cause  
harmful interference, and (2) this device must accept any interference  
received including the interference that may cause.  
CE NOTICE  
Marking by the symbol  
indicates compliance of this equipment to  
the EMC directive of the European Community. Such marking is indica-  
tive that this equipment meets or exceeds the following technical stan-  
dards:  
EMC Class B  
EN 50081-1/1992 : EN55022:1994/A1:1995/A2:1997 Class B  
EN61000-3-2:2000  
EN61000-3-3:1995/A1:2001  
EN 55024:1998/A1:2001  
IEC 61000-4-2:1995  
IEC 61000-4-3:1995  
IEC 61000-4-4:1995  
IEC 61000-4-5:1995  
IEC 61000-4-6:1996  
IEC 61000-4-8:1993  
IEC 61000-4-11:1994  
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Table of Contents  
1. Introduction......................................................... 5  
1.1 Features ........................................................................................ 6  
1.2 Specifications ................................................................................ 7  
2. Installation ......................................................... 12  
2.1 Unpacking .................................................................................... 12  
2.2 Safety Cautions .......................................................................... 13  
2.3 DIN-Rail Mounting ....................................................................... 14  
2.4 Panel Mounting ............................................................................ 16  
2.5 Applying Power ........................................................................... 18  
2.6 Power Failure Relay Output ........................................................ 21  
2.7 DIP SW Configuration .................................................................. 22  
2.7.1 RS-485/422 Driver and Receiver Control ................................. 28  
2.8 Making Serial RS-232 Connection .............................................. 29  
2.8.1 Cable for Connection to PC COM Port ..................................... 31  
3 Making RS-485/422 Connection ....................... 32  
3.1 RS-422 Point-to-Point Circuit ...................................................... 33  
3.2 RS-422 Multi-drop Network ......................................................... 34  
3.3 RS-485 Multi-drop Network ......................................................... 36  
3.4 RS-485 Half-duplex 2-wire Network ............................................ 38  
3.5 RS-485 Full-duplex 4-wire Network ............................................ 39  
3.6 Summary of the Converter Applications ...................................... 41  
4 LED Indicators ................................................... 42  
4.1 LED Indicators ............................................................................. 42  
5 Factory Default Configuration .......................... 43  
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1. Introduction  
The industrial converter is designed to convert RS-232 signals to opti-  
cally isolated, balanced, full or half-duplex RS-422 or RS-485 signals at  
baud rate up to 115.2Kbps. It features RTS control design, which allows  
TM  
software to control RS-485 transmission. With smart ADC (Auto Data  
Control) design, the converter can uses send data signal to control RS-  
485 transmission automatically so no software control is required in RS-  
485 mode. The Din-rail mountable design makes it ideal for industrial  
cabinets and enclosures. Further, more designs such as signal protec-  
tion, wide operating temperature range, wide power voltage range are  
provided to suit for more industrial applications.  
For industrial environment, the converters are designed with the follow-  
ing enhanced features exceeding that of commercial media converters:  
High and wide operating Temperature  
Wide operating voltage range for DC power input  
Power input interface: Industrial screw terminal block and DC  
power jack for external commercial power adapter as option  
DIN rail mounting support for industrial enclosure  
Screw panel mounting support for industrial enclosure  
Industrial-rated Emission and Immunity performance  
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1.1 Features  
Supports RS-232 baud rate up to 115.2Kbps  
Operation with no required configuration  
Provides surge protection (transient voltage) on all interface lines  
Provides high ESD protection on all line signals  
Optical isolated between RS-232 and RS-485/422 interfaces  
Supports RS-422, 2-wire RS-485, and 4-wire RS-485 network  
Supports full-duplex or half-duplex for RS-485/422 interface  
Provides remote RTS control for RS-485 transmission  
TM  
ProvidesADC (AutoData Control) for RS-485 transmission  
Designed for industrial environments with:  
- Surge, ESD, and isolation protection  
-DIN-rail and panel mounting support  
- Wide power voltage range support  
- Terminal block and Jack-type power connectors  
- Wide operating temperature range support  
-Alarm relay output for device power failure  
- Industrial-rated emission and immunity performance  
-6-  
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1.2 Specifications  
This figure shows the important components of the device:  
-7-  
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Serial Interface (RS-232 Port)  
Connector  
DB9 female  
Pin Assignments  
Baud Rate Support  
Connector Shield  
Connection Distance  
High ESDTolerance  
DCE type  
Up to 115K baud  
Connect to chassis ground  
15 meters  
+/-15KV on Tx, Rx lines  
Overvoltage Protection Cutoff if over +/-28V  
Isolation  
Optical isolation with RS-485/422 interface  
RS-485/422 Interface  
Connector  
Signal Type  
Screw-type terminal block  
Balanced differential lines  
115Kbps  
Data Speed  
Standard  
EIA-485, EIA-422  
High ESDTolerance  
+/-15KV on driver and receiver lines  
Overvoltage Protection Cutoff if over +/-28V  
LEDIndicators  
LED  
DISPLAY  
STATE INTERPRETATION  
PWR  
Power status  
ON  
Power on  
OFF  
Power off  
232 TX RS-232 TX  
232RX RS-232RX  
BLINK  
BLINK  
RS-232 TXActivity  
RS-232 RXActivity  
RS-485 driver is enabled  
RS-485 driver is disabled  
TXC  
RS-485/422 TX control ON  
OFF  
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ConfigurationDIPSW Settings  
SW  
Name State Function  
SW1-2&1 4W  
2W  
Off  
On  
4-wire (RS-485/422 driver receiver separated)  
2-wire (RS-485/422 driver receiver connected)  
SW1-3  
SW1-4  
SW1-5  
SW1-6  
T -D  
T -E  
Off  
On  
Disable RS-485/422 receiver terminator  
Enable RS-485/422 receiver terminator  
TXC  
TXE  
Off  
On  
RS-485/422 driver enable control by RTS or ADC  
RS-485/422 driver is forced to enable  
RTS-D Off  
RTS-E On  
Disable RTS control for RS-485/422 TX RX  
Enable RTS control for RS-485/422 TX RX  
RXC  
RXE  
Off  
On  
RS-485/422 receiver enable control by RTS or ADC  
RS-485/422 receiver is forced to enable.  
SW1-8&7 BIAS-D Off  
BIAS-E On  
RS-485/422 line bias is disabled  
RS-485/422 line bias is enabled  
SW2-1  
SDD  
SDE  
Off  
On  
Disable ADC control for RS-485/422 TX RX  
Enable ADC control for RS-485/422 TX RX  
SW2-2  
SW2-3  
SW2-4  
SW2-5  
SW2-6  
SW2-7  
SW2-8  
1200 On  
2400 On  
4800 On  
9600 On  
19200 On  
38400 On  
115200 On  
ADC Timing parameter for RS-232 baud 1200  
ADC Timing parameter for RS-232 baud 2400  
ADC Timing parameter for RS-232 baud 4800  
ADC Timing parameter for RS-232 baud 9600  
ADC Timing parameter for RS-232 baud 19200  
ADC Timing parameter for RS-232 baud 38400  
ADC Timing parameter for RS-232 baud 115200  
-9-  
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DC Power Interface  
Interface  
Screw-type terminal block  
1. Two pairs for power wire cascading  
2. One pair for power failure relay output  
DCJack(-D6.3mm/+D2.0mm)  
Operating Input Voltages +7V~+30V(+5%)  
Power consumption  
0.6W@+7.5VDC, 12VDC, 30VDC input  
Basic Information  
Conversion  
RS-232 RX data to RS-485/422 TX data  
RS-485/422 RX data to RS-232 TX data  
Isolated between RS-232 and RS-485/422  
3000VDCrms  
Optical Isolation  
Mechanical  
Dimension (base)  
Housing  
Mounting Support  
Weight  
W28mmxD82mmxH95mm  
Enclosed metal with no fan  
DIN-rail mounting, Panel mounting  
240g  
Environmental  
Operating Temperature  
Storage Temperature  
Relative Humidity  
-20oC ~ 70oC  
-20oC ~ 85oC  
5% ~ 90%  
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Certificate  
FCC  
CE/EMC  
Part 15 Class B  
EMI EN50081-1 Class B  
EMSEN55024  
EN60950  
CE/LVDSafety  
EN 50081-1/1992 :  
EN55022:1994/A1:1995/A2:1997  
EN61000-3-2:2000  
EN61000-3-3:1995/A1:2001  
EN 55024:1998/A1:2001  
IEC 61000-4-2:1995 ESD Test  
IEC 61000-4-3:1995 RS Test  
IEC 61000-4-4:1995 EFT/BURST Test  
IEC 61000-4-5:1995 Surge Test  
IEC 61000-4-6:1996 CS Test  
IEC 61000-4-8:1993 Magnetic Field  
IEC 61000-4-11:1994 Volatge Int. Dips  
-11-  
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2. Installation  
2.1 Unpacking  
Check that the following components have been included:  
Information CD  
The device unit  
DIN-rail mounting bracket  
If any item is found missing or damaged, please contact your local reseller  
for replacement.  
The following are available optional accessories:  
Panel Mounting Bracket  
The bracket is used for mounting the device on a panel surface.  
Commercial-ratedAC power adapters:  
- Rated AC120V/60Hz DC7.5V 1A  
- Rated AC230V/50Hz DC7.5V 1A  
- Rated AC100V/50-60Hz DC7.5V 1A  
- Rated AC240V/50Hz DC7.5V 1A  
The adapters are used for supplying DC power to the converter  
via DC power jack interface.  
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2.2 Safety Cautions  
To reduce the risk of bodily injury, electrical shock, fire, and damage to  
the equipment, observe the following precautions.  
• Do not service any product except as explained in your system  
documentation.  
Opening or removing covers may expose you to electrical shock.  
Only a trained service technician should service components inside  
these compartments.  
If any of the following conditions occur, unplug the product from the  
electrical outlet and replace the part or contact your trained service  
provider:  
- The power cable, extension cable, or plug is damaged.  
- An object has fallen into the product.  
- The product has been exposed to water.  
- The product has been dropped or damaged.  
- The product does not operate correctly when you follow the  
operating instructions.  
• Do not push any objects into the openings of your system. Doing  
so can cause fire or electric shock by shorting out interior compo-  
nents.  
• Operate the product only from the type of external power source  
indicated on the electrical ratings label. If you are not sure of the  
type of power source required, consult your service provider or local  
power company.  
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2.3 DIN-Rail Mounting  
In the product package, a DIN-rail bracket is installed on the device for  
mounting the converter in a industrial DIN-rail enclosure.  
The steps to mount the device onto a DIN rail are:  
1. Install the mounting bracket onto the device unit as shown below:  
2. Attach bracket to the lower edge of the DIN rail and push the unit  
upward a little bit until the bracket can clamp on the upper edge of  
the DIN rail.  
3. Clamp the unit to the DIN rail and make sure it is mounted securely.  
4. Make sure that there are proper heat dissipation from and adequate  
ventilation around the device.  
-14-  
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The final mechanical dimensions after installingDIN rail mounting bracket  
are:  
-15-  
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2.4 Panel Mounting  
The device is provided with an optional panel mounting bracket. The  
bracket support mounting the device on a plane surface securely. The  
mounting steps are:  
1. Install the mounting bracket on the device unit.  
2. Screw the bracket on the device unit.  
3. Screw the device unit on a panel.  
4. Make sure that there are proper heat dissipation from and adequate  
ventilation around the device. Do not place heavy objects on the  
device.  
-16-  
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The screw locations and final dimension are shown below:  
-17-  
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2.5 Applying Power  
The power specifications of the device are:  
Operating Voltage  
+7~+30VDC  
Power Consumption Max.0.6W@+30VDC,+12VDC,+7.5VDC  
The device provides two types of power interfaces, terminal block and DC  
power jack for receivingDC power input from external power supply.  
Using Terminal Blocks  
Either DC1 interface or DC2 interface can be used to receive DC power  
from an external power system. Or, DC2 also can be used to deliver the  
power received on DC1 to next device in cascading way.  
DC1+  
DC1-  
DC2+  
DC2-  
Vdc Positive (+) terminal  
Vdc Negative (-) terminal  
Vdc Positive (+) terminal  
Vdc Negative (-) terminal  
Three 2P terminal plugs are provided together with the device. Two of the  
three plugs are used forDC1 andDC2 interfaces respectively. The plug is  
shown below:  
-18-  
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Power wires: 24 ~ 12AWG(IEC 0.5~2.5mm2)  
Install the power source wires with the plug properly. Screw the wire with  
plug securely. Then, plug in DC1 contacts.  
If cascading the power to next device is needed, install the power wires  
and plug for another switch. Then, use DC2 contacts.  
Note: Only up to four device units can be cascaded to receive power  
from one main power input source.  
-19-  
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UsingDC Power Jack  
DC Jack Connector: JackD6.3mm  
D2.0mm  
AC Power Adapters: Optional commercial rated adapters are available  
for purchasing.  
Rated AC120V/60Hz DC7.5V 1A  
Rated AC230V/50Hz DC7.5V 1A  
Rated AC100V/50-60Hz DC7.5V 1A  
Rated AC240V/50Hz DC7.5V 1A  
Connect power adapter DC plug to the DC power jack of the converter  
before connecting to the AC outlet. Connect the power adapter to the  
AC outlet.  
Note: Before you begin the installation, check the AC voltage of your  
area. The AC power adapter which is used to supply the DC power  
for the unit should have the AC voltage matching the commercial  
power voltage in your area.  
-20-  
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2.6 Power Failure Relay Output  
The device provides a relay output to report power failure event to a  
remote alarm monitoring system. The replay output is provided with two  
contacts labeled PF+ and PF- in the terminal block interface.  
Use the provided 2Pterminal plug for signal wiring and plug into the PF+/  
- contacts. The function is designed as :  
Power is normal PF+ contact is shorted with PF- contact.  
Power failure  
PF+ contact is disconnected with PF- contact.  
Note: Be sure the voltage applied on PF+/- contacts is within the  
specification of 30VDC/1A max. or 120VAC/0.5A max.  
-21-  
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2.7 DIP SW Configuration  
SW1-2 & 1  
4W 4-wire (RS-485/422 driver receiver separated)  
2W 2-wire (RS-485/422 driver receiver connected)  
[2W] setting activates the internal connection between driver and re-  
ceiver in RS-485/422 interface. It simplifies the installation of the con-  
verter in a 2-wire bus. RS-422 usually uses 2-wire topology only. RS-485  
supports both 2-wire and 4-wire topology.  
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SW1-3  
T-D Disable RS-485/422 receiver terminator  
T-E Enable RS-485/422 receiver terminator  
[T-E] setting enables the internal 120 ohms terminator on the receiver  
interface. A proper termination is important in a bus topology or multi-  
drop network. The terminator is a resistor added in parallel with the  
receiver's "A" and "B" lines in order to match the data line characteristic  
impedance and reduce signal reflection. This setting is useful when the  
converter is installed at the end of a RS-485 or RS-422 bus.  
If the internal 120 Ohm terminator is not appropriate for your application,  
use [T-D] to disable it and use external one.  
-23-  
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SW1-4  
TXC RS-485/422 driver enable control by RTS orADC  
TXE RS-485/422 driver is forced to enable  
[TXC] setting enables RS-485/422 driver to be controlled by RTS method  
orADC method. RTS method is described later. Refer to SW2 settings for  
more description aboutADC method.  
[TXE] setting forces RS-485/422 driver to be enabled always. This setting  
is applied when Master function is required in an RS-485/RS-422 multi-  
drop bus.  
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SW1-5  
RTS-D  
RTS-E  
Disable RTS control for RS-485/422 driver  
Enable RTS control for RS-485/422 driver  
RTS control method allows the connected RS-232 device (such as a PC)  
to control RTS signal (CTS input at the converter end) by software to  
enable or disable RS-485/422 driver. [RTS-D] setting is used to disable  
RTS control method.  
SW1-6  
RXC RS-485/422 receiver enable control by RTS orADC  
RXE RS-485/422 receiver is forced to enable.  
[RXC] setting enable to use the same [TXC] logic but reverse it as RXC  
for the RS-485/422 receiver control. It means when the driver is enabled  
the receiver is disabled. The receiver is enabled when the driver is dis-  
abled. This setting is applied when a half-duplex communication is  
adopted.  
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SW1-8&7  
BIAS-D RS-485/422 receiver line bias is disabled  
BIAS-E RS-485/422 receiver line bias is enabled  
The line bias is used to maintain the proper idle-state voltage to the idle  
condition (when no driver is enabled on the bus). These bias resistors are  
pull-up resistors on the data B line and pull-down resistors (to ground)  
on dataAline. In 4-wire configuration, the bias resistors are placed on the  
receiver lines. [BIAS-D] disables the internal BIAS resistors on receiver  
lines.  
[BIAS-E] setting enables internal bias resistors. The bias configuration  
can support up to 30 receiver nodes with no terminators. If the bias  
configuration is not proper for your physical topology, set to [BIAS-D]  
and use external bias design according to your application.  
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SW2-1  
SDD DisableADC control for RS-485/422 driver  
SDE EnableADC control for RS-485/422 driver  
ADC method involves special circuitry that senses when data is received  
on the RS-232 interface and is being transmitted and automatically en-  
ables the RS-485/422 driver as well as disabling the driver within one  
character length of the end of transmission. This is a useful method for  
driver control since it needs no software involved.  
In order to obtain an optimal performance, set SW2-2 ~ SW2-8 the asso-  
ciated timing parameter for each RS-232 baud rate.  
SW2-2 1200  
SW2-3 2400  
SW2-4 4800  
SW2-5 9600  
SW2-6 19200  
SW2-7 38400  
SW2-8 115200  
ADC Timing parameter for RS-232 baud 1200  
ADC Timing parameter for RS-232 baud 2400  
ADC Timing parameter for RS-232 baud 4800  
ADC Timing parameter for RS-232 baud 9600  
ADC Timing parameter for RS-232 baud 19200  
ADC Timing parameter for RS-232 baud 38400  
ADC Timing parameter for RS-232 baud 115200  
-27-  
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2.7.1 RS-485/422 Driver and Receiver Control  
The following table lists the possibleDIP SW settings related to RS-485  
and RS-422 driver and receiver control:  
SW1-4 SW1-6 SW1-5 SW2-1 Behavior  
TXE  
TXE  
TXC  
TXC  
TXC  
RXC  
RXE  
RXE  
RXE  
RXC  
RTS-D  
SDD  
Driver is enabled.  
Receiver is disabled.  
-
-
Driver is enabled.  
Receiver is enabled.  
RTS-D  
RTS-E  
RTS-E  
SDD  
SDD  
SDD  
Driver is disabled.  
Receiver is enabled.  
Driver controlled by RTS  
Receiver is enabled.  
Driver controlled by RTS  
Receiver is enabled  
when driver is disabled.  
TXC  
TXC  
RXE  
RXC  
RTS-D  
RTS-D  
SDE  
SDE  
Driver controlled byADC  
Receiver is enabled.  
Driver controlled byADC  
Receiver is enabled  
when driver is disabled.  
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2.8 Making Serial RS-232 Connection  
Typical RS-232 InterfaceDCE PinAssignment Table  
Pin#  
Signal Name  
Received Line Signal Detect  
TX Data  
RX Data  
DTE Ready  
Signal Ground  
DCE Ready  
Clear To Send  
Request To Send  
Ring Indicator  
Input/Output  
Output  
Output  
Input  
1
2
3
4
5
6
7
8
9
Input  
Output  
Output  
Input  
Output  
Output  
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The RS-232 to RS-485/422 converter as an interface between an RS-232  
device and RS-485 or RS-422 bus. The connection is illustrated as fol-  
lows:  
The following signals received on the RS-232 interface are converted to  
RS-485 bus signals:  
Pin#  
SignalName  
TXData  
RXData  
Input/Output  
Output  
Input  
2
3
7
Clear To Send  
Input  
-30-  
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2.8.1 Cable for Connection to PC COM Port  
Connecting to 9-pinDTE device (Computer or PC COM)  
Connecting to 25-pinDTE device (Computer or PC COM)  
-31-  
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3 Making RS-485/422 Connection  
EIA-485 [TIA-485] Balanced (differential) interface; defines the Physical  
layer, signaling protocol is not defined. EIA-485 specifies bidirectional,  
half-duplex data transmission. Up to 32 transmitters and 32 receivers may  
be interconnected in any combination, including one driver and multiple  
receivers (multi-drop), or one receiver and multiple drivers.  
EIA/TIA-422 define a Balanced (differential) interface; specifying a single,  
unidirectional driver with multiple receivers (up to 32). RS-422 will sup-  
port Point-to-Point, Multi-Drop topology, but not Multi-Point [EIA485].  
EIA-485 devices may be used in 422 circuits, but EIA-422 may not be  
used in 485 circuits (because of the lack of an Enable line).  
The published TIA/EIA485 and RS-422 standards define only the electri-  
cal characteristics of the drivers and receivers as listed below. They did  
not standardize such things such as cables and connectors, pinouts, bus  
arbitration, signaling protocols, or physical wiring topology. Many dif-  
ferent implementations have come into use and they are often incompat-  
ible with each other.  
Characteristics  
RS-422  
RS-485  
Mode of operation  
Differential  
Unidirectional  
Multipoint  
1 Tx, 10 Rx  
4000ft length  
10Mbps  
Differential  
FullDuplex  
Multipoint  
32 Tx, 32 Rx  
4000ft length  
10Mbps  
+/- 1.5V  
Allowed no. of Tx and Rx  
Maximum cable length  
Maximum data rate  
Minimum Tx driver output range +/- 2V  
Maximum Tx driver output range +/- 5V  
Maximum Tx short-circuit current 150mA  
+/- 5V  
250mA  
Tx load impedance  
Rx input sensitivity  
Maximum Rx input resistance  
Rx input voltage range  
Rx logic high  
100  
+/- 200mV  
4k  
+/- 7V  
>200mV  
<200mV  
54  
+/- 200mV  
12k  
-7V to +12V  
>200mV  
<200mV  
Rx logic low  
-32-  
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RS-485 and RS-422 are in wide use as an interface for telecommunica-  
tions, industrial, medical, security and networking applications. The fol-  
lowing sections describe examples of some of popular physical  
topologies.  
3.1 RS-422 Point-to-Point Circuit  
This is the simplest configuration, just one driver and one receiver. If  
termination is used, it is only required at the receiver. Most RS-422 cables  
used to connect telecom or data-com equipment are point to point links.  
The converter can convert an RS-232 device into a Driver node in this  
point-to-point circuit.  
The configuration is:  
SW1-4  
SW1-6  
SW1-5  
SW2-1  
TXE  
EnableDriver always  
Enable Receiver RTS/ADC Control  
Disable RTS control  
RXC  
RTS-D  
SDD  
DisableADC control  
-33-  
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It also can convert an RS-232 device into a receiver node in this point-to-  
point circuit.  
The configuration for a RECEIVER node is:  
SW1-4  
SW1-6  
SW1-5  
SW2-1  
TXC  
RXE  
RTS-D  
SDD  
Enable RTS/ADC Control forDriver  
Enable Receiver always  
Disable RTS control  
DisableADC control  
3.2 RS-422 Multi-drop Network  
In this topology there is only one driver sending to one or more receiv-  
ers. One termination resistor is recommended at the extreme end of the  
bus to eliminate reflections. Up to 10 receivers are permitted under RS-  
422. Multiple receive-only nodes may be used for point-to-multipoint  
communications.  
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The converter can convert an RS-232 device into a Master node in this  
multi-drop network.  
The configuration for MASTER node is:  
SW1-4  
SW1-6  
SW1-5  
SW2-1  
TXE  
EnableDriver always  
Enable Receiver RTS/ADC Control  
Disable RTS control  
RXC  
RTS-D  
SDD  
DisableADC control  
It also can convert an RS-232 device into a SLAVE node in this multi-drop  
network.  
The configuration for a SLAVE node is:  
SW1-4  
SW1-6  
SW1-5  
SW2-1  
TXC  
RXE  
RTS-D  
SDD  
Enable RTS/ADC Control forDriver  
Enable Receiver always  
Disable RTS control  
DisableADC control  
-35-  
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3.3 RS-485 Multi-drop Network  
This topology is similar to RS-422 multi-drop. However, up to 32 receiv-  
ers are permitted under RS-485. This may be used for point-to-multipoint  
communications.  
The converter can convert an RS-232 device into a Master node in this  
multi-drop network as illustrated below:  
The configuration for MASTER node is:  
SW1-4  
SW1-6  
SW1-5  
SW2-1  
TXE  
EnableDriver always  
Enable Receiver RTS/ADC Control  
Disable RTS control  
RXC  
RTS-D  
SDD  
DisableADC control  
-36-  
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It is also able to convert an RS-232 device into a SLAVE node in this multi-  
drop network.  
The configuration for a SLAVE node is:  
SW1-4  
SW1-6  
SW1-5  
SW2-1  
TXC  
RXE  
RTS-D  
SDD  
Enable RTS/ADC Control forDriver  
Enable Receiver always  
Disable RTS control  
DisableADC control  
-37-  
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3.4 RS-485 Half-duplex 2-wire Network  
This is the typical RS-485 topology. It takes advantage of RS-485 capabil-  
ity to support multiple drivers on a bus. RS-422 devices should not be  
used in this configuration. This topology enables bidirectional communi-  
cation from many nodes over long distances at low to medium data rates,  
all on a single pair of wires (2-wire).  
It can implement a very functional, very flexible and very economical data  
network. Because signals travel in both directions, this bus should be  
terminated at both ends to prevent reflections. Only one node can drive  
the bus at a time, making this a half-duplex communication channel. Only  
one driver should be active at any one time. Therefore the transceivers  
used on a half-duplex bus should support a Driver Enable function.  
-38-  
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The converter features RS-485 driver and receiver in one device. It also  
provides very flexible configuration settings for Driver Enable control  
and Receiver Enable control. The configuration for the node in RS-485 2-  
wire network is:  
SW1-2&1 2W  
Select 2-wire topology  
SW1-4  
SW1-6  
SW1-5  
SW2-1  
TXC  
RXC  
RTS-E  
SDE  
Enable RTS/ADC Control forDriver  
Enable RTS/ADC Control for Receiver  
Use RTS control (optional)  
UseADC control (optional)  
SW2-2-8 Baud  
SW1-3 T-D  
Baud whenADC control is enabled (optional)  
Disable internal terminator (optional)  
3.5 RS-485 Full-duplex 4-wire Network  
The 4-wire network simplifies bus arbitration in multi-node RS-485. A  
single Master node is the only driver allowed on the top most wire pair.  
All other nodes listen to all data traffic that passes on the party-line type  
multi-drop bus. Nodes may transmit on the lower pair of wires when  
addressed by the master node or by using a software token-passing bus  
arbitration scheme.  
-39-  
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The master node may drive its bus while any of the slave nodes are  
driving the lower pair, making this 4-wire network a full-duplex communi-  
cation channel. All communication occurs from master to slave or slave  
to master, so any peer to peer communications must be routed through  
the master node.  
To convert an RS-232 device into a Master node in RS-485 4-wire net-  
work, the configuration is:  
SW1-2&1 4W  
Select 4-wire topology  
SW1-4  
SW1-6  
SW1-5  
SW2-1  
SW2-2-8 Baud  
SW1-3 T-D  
TXE  
RXC  
RTS-E  
SDE  
EnableDriver always  
Enable RTS/ADC Control for Receiver  
Use RTS control (optional)  
Or useADC control (optional)  
Baud when ADC control is enabled (optional)  
Disable internal terminator (optional)  
To convert an RS-232 device into a Slave node in RS-485 4-wire network,  
the configuration is:  
SW1-2&1 4W  
Select 4-wire topology  
SW1-4  
SW1-6  
SW1-5  
SW2-1  
SW2-2-8 Baud  
SW1-3 T-D  
TXC  
RXE  
RTS-E  
SDE  
Enable RTS/ADC Control forDriver  
Enable Receiver always  
Use RTS control (optional)  
Or useADC control (optional)  
Baud when ADC control is enabled (optional)  
Disable internal terminator (optional)  
-40-  
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3.6 Summary of the Converter Applications  
The common topologies implemented with RS-485 and RS-422 are:  
1. RS-422 point to point in 2 -wire circuit  
2. RS-422 2-wire multi-drop network  
3. RS-485 2-wire multi-drop network  
4. RS-485 half-duplex bidirectional network in 2-wire topology  
5. RS-485 full-duplex bidirectional network in 4-wire topology  
The converter is equipped with functionality and flexibility to convert an  
RS-232 device to a node in any one of the above topologies.  
-41-  
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4 LED Indicators  
The following figure shows the locations of the LED indicators:  
4.1 LED Indicators  
LED  
DISPLAY  
STATE INTERPRETATION  
PWR  
Power status  
ON  
OFF  
The device is powered on.  
The device is powered off.  
232 TX RS-232 TX  
232RX RS-232RX  
ON  
OFF  
RS-232 TX data is present  
No RS-232 TX data  
ON  
OFF  
RS-232 RX data is present  
No RS-232 RX data  
TXC  
RS-485  
ON  
The driver is enabled.  
Driver Enable  
OFF  
The driver is disabled and  
is in tri-state (high-impedance).  
-42-  
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5 Factory Default Configuration  
The following table lists the factory default settings for configuration  
DIPSW:  
SW  
Name  
Default Setting  
SW1-2&1 4W  
4-wire (RS-485/422 driver receiver separated)  
SW1-3  
SW1-4  
SW1-5  
SW1-6  
T-D(Off)  
TXC (Off)  
Disable RS-485/422 receiver terminator  
RS-485/422 driver enable control by RTS orADC  
RTS-D (Off) Disable RTS control for RS-485/422 driver  
RXC(Off) RS-485/422receiverenablecontrolbyRTSorADC  
SW1-8&7 BIAS-D (Off) Disable RS-485/422 line bias  
SW2-1  
SW2-2  
SW2-3  
SW2-4  
SW2-5  
SW2-6  
SW2-7  
SW2-8  
SDE (On)  
Off  
EnableADC control for RS-485/422 driver  
DisableADC Timing for RS-232 baud 1200  
DisableADC Timing for RS-232 baud 2400  
DisableADC Timing for RS-232 baud 4800  
SelectADC Timing for RS-232 baud 9600  
DisableADC Timing for RS-232 baud 19200  
DisableADC Timing for RS-232 baud 38400  
DisableADC Timing for RS-232 baud 115200  
Off  
Off  
9600 (On)  
Off  
Off  
Off  
-43-  
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