Black Box TV Converter Box RS0232 User Manual

FEBRUARY 1998  
IC456A-R3  
IC456A-R4  
IC456C-R3  
IC456C-R4  
RS-232RS-422  
Interface Converter  
232  
422  
A
T
DSR CTS DA  
T
PWR  
RR  
A
T
DSR CTS DA  
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)  
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746  
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018  
CUSTOMER  
SUPPORT  
INFORMATION  
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RS-232RS-422 INTERFACE CONVERTER  
INSTRUCCIONES DE SEGURIDAD (Normas Oficiales Mexicanas Electrical Safety Statement)  
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado.  
2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura.  
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas.  
4. Todas las instrucciones de operación y uso deben ser seguidas.  
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca de la tina de baño, lavabo, sótano  
mojado o cerca de una alberca, etc..  
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que sean recomendados por el fabricante.  
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante.  
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de  
operación. Todo otro servicio deberá ser referido a personal de servicio calificado.  
9. El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso. La colocación del aparato  
eléctrico sobre una cama, sofá, alfombra o superficie similar puede bloquea la ventilación, no se debe colocar en  
libreros o gabinetes que impidan el flujo de aire por los orificios de ventilación.  
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor como radiadores, registros de calor, estufas  
u otros aparatos (incluyendo amplificadores) que producen calor.  
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo de  
operación, o como se indique en el aparato.  
12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada.  
13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos  
colocados sobre o contra ellos, poniendo particular atención a los contactos y receptáculos donde salen del aparato.  
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante.  
15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas de energia.  
16. El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo.  
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de  
ventilación.  
18. Servicio por personal calificado deberá ser provisto cuando:  
A: El cable de poder o el contacto ha sido dañado; u  
B: Objectos han caído o líquido ha sido derramado dentro del aparato; o  
C: El aparato ha sido expuesto a la lluvia; o  
D: El aparato parece no operar normalmente o muestra un cambio en su desempeño; o  
E: El aparato ha sido tirado o su cubierta ha sido dañada.  
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RS-232RS-422 INTERFACE CONVERTER  
TRADEMARKS USED IN THIS MANUAL  
Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.  
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RS-232RS-422 INTERFACE CONVERTER  
Contents  
Chapter  
Page  
1.Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4  
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5  
3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7  
3.1 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7  
3.2 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11  
4. Ground Strap and Interface Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14  
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RS-232RS-422 INTERFACE CONVERTER  
1. Specifications  
64,000 bps, max.  
Speed —  
Connectors —  
Indicators —  
RS-232 port: DB25 female; RS-422 port: DB37 female  
7 LEDs show status of RS-232 and RS-422 signals and indicate power ON.  
RS-232 Port: DSR, CTS, DATA;  
RS-422 Port: DSR, CTS, DATA  
Controls —  
RS-232 port: DTE/DCE DIP shunts;  
RS-422 port: DTE/DCE DIP shunts;  
DIP switch to enable receiver termination  
Environment — Storage Temperature: -4 to +158°F (-20 to +70°C);  
Operating Temperature: 32 to 122°F (0 to 50°C)  
Power —  
Size —  
115 VAC Supply: 10%, 100 mA  
230 VAC Supply: 10%, 50 mA  
Standalone: 2.3"H x 8"W x 11.9"D (5.8 x 20.3 x 30.2 cm);  
Rackmount: 1.2"H x 7.5"W x 11.4"D (3.1 x 19.1 x 29 cm)  
Weight —  
Standalone: 2 lb. (1 kg);  
Rackmount: 10 oz. (283.5 g)  
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RS-232RS-422 INTERFACE CONVERTER  
2. Introduction  
The RS-232RS-422 Interface Converter provides bi-directional synchronous or asynchronous  
conversion of all commonly used RS-232 and RS-422 signals. The unit is designed to operate with one  
port configured as Data Terminal Equipment (DTE) and the other port as Data Communications  
Equipment (DCE). Operation is not recommended with both ports configured either DCE or both DTE,  
when operating in synchronous mode.  
The unit has two user-selectable configurations: one for connecting RS-422 modem equipment to RS-232  
terminal equipment (DCE to DTE) and one for connecting RS-232 modem equipment to RS-422  
terminal equipment (DCE to DTE). Both configurations allow bi-directional data transfer. Typical  
applications are shown in Figure 2-1.  
Things to consider when operating the converter:  
DIP-SHUNT SETTINGS:  
RS-232  
DTE  
RS-422  
DCE  
INTERFACE  
CONVERTER  
MODEM  
ELIMINATOR  
(RS-232)  
SYNC  
RS-422  
COMPUTER  
SYNC  
RS-232  
COMPUTER  
DIP-SHUNT SETTINGS:  
RS-422  
RS-232  
DTE  
DCE  
RS-422  
MODEM  
INTERFACE  
CONVERTER  
RS-232  
TERMINAL  
DIP-SHUNT SETTINGS:  
RS-232  
DTE  
RS-422  
DCE  
RS-232  
MODEM  
INTERFACE  
CONVERTER  
RS-422  
TERMINAL  
4-WIRE CABLE  
DIP-SHUNT  
SETTINGS:  
6 (R-)  
T-  
RS-232  
DCE  
RS-422  
DTE  
24 (R+)  
4 (T-)  
T+  
R-  
22 (T+)  
R+  
INTERFACE  
CONVERTER  
PC  
INDUSTRIAL  
CONTROLLER  
Figure 2-1. Various Applications Showing DCE/DTE Settings.  
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RS-232RS-422 INTERFACE CONVERTER  
1. The Converter does not require special handshaking signals in order to operate.  
2. The Converter should always be configured the opposite of the equipment it’s connected to if  
straight-through cabling is used. For example, if you are connecting a modem (a DCE device) to the  
Converter, configure the Converter’s port connected to the modem as DTE.  
3. Some industrial controllers include RTS+, RTS-, CTS+, and CTS-. If necessary, in most cases, these  
can be jumpered together.  
4. According to EIA specifications, RS-422 signals are A and B, where mark = B>A in voltage and space  
+ A>B in voltage. Many manufacturers label their leads as + and -. In most cases, +=B and -=A is the  
scheme the Converter uses. However, some manufacturers have reversed this scheme. Consult the  
manufacturer of your RS-422 equipment if you have problems.  
Models  
There are three models of the RS-232RS-422 Interface Converter.  
IC456A-R3 — a standalone unit for 115-VAC operation.  
• IC456AE-R3 a standalone unit for 230-VAC operation.  
IC456C-R3 — a printed circuit card for rack-mounted units.  
The same RS-232RS-422 printed circuit card is used for both 115- and 230-VAC applications. An  
Interface Converter Rack (RM060) is available through your sales representative. This is a 19-inch rack  
capable of holding up to eight printed-circuit cards. The rack has its own power supply which is switch  
selectable between 115- and 230-VAC operation.  
If you ordered the IC456A-R4 or IC456C-R4, you should have received cables with your RS-232RS-422  
Interface Converter.  
7
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RS-232RS-422 INTERFACE CONVERTER  
3. Installation  
To connect the Converter to your devices, follow these steps:  
1. Attach the cable from the RS-422 device to the 37-pin female receptacle on the rear panel of the  
Converter.  
2. Attach the cable from the RS-232 device to the 25-pin female receptacle on the rear panel of the  
Converter.  
3. Plug the 4-pin power cord into the receptacle on the rear panel of the case. However, don’t plug the  
power module into an AC outlet at this time. You can power up only after you have configured the  
Converter’s DTE/DCE DIP shunts (Section 3.1).  
3.1 Configuration  
The Converter’s RS-232 and RS-422 ports must each be set for DCE or DTE operation. Configuration is  
accomplished through DIP shunts located inside the unit on the printed circuit board (see Figures 3-1  
and 3-2). One configuration is for connecting RS-422 DCE to RS-232 DTE. The second configuration is  
for connecting RS-232 DCE to RS-422 DTE. Refer to Table 3-1 for the DTE/DCE settings appropriate to  
your application.  
Table 3-1. DTE/DCE DIP Shunt Settings.  
RS-422 Port  
put a DIP shunt  
RS-232 Port  
to appear  
as  
to appear  
as  
put a DIP shunt  
in  
in  
DTE  
XW1A  
XW2A  
XW3A  
DTE  
XW4A  
XW5A  
DCE  
XW1B  
XW2B  
XW3B  
DCE  
XW4B  
XW5B  
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RS-232RS-422 INTERFACE CONVERTER  
RACK POWER  
CONNECTOR  
AC POWER  
CONNECTOR  
RS-422  
CONNECTOR  
RS-232  
CONNECTOR  
XW1A XW2A  
XW3A XW4A XW4B XW5A  
DIP SHUNTS  
XW5B  
XW1B XW2B XW3B  
DIP SHUNTS  
S1  
CR8 CR5 CR6  
CR10  
CR9 CR4 CR7  
DSR CTS DATA  
DSR CTS DATA  
POWER  
RS-422  
INDICATORS  
RS-232  
INDICATORS  
Figure 3-1. Board Layout Showing Component Locations.  
(Dashed Lines show DTE/DCE DIP Shunt Locations.)  
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RS-232RS-422 INTERFACE CONVERTER  
RS-422 INTERFACE  
SET TO DCE  
DSR  
CR8 RS-422 TO RS-232 DTR/DSR  
P1  
DTE  
DTE  
DCE  
DCE  
DCE  
CTS  
CR5 RS-422 TO RS-232 RTS/CTS  
CR6 RS-422 TO RS-232 DATA  
XW1A  
XW2A  
XW1B  
XW2B  
XW3B  
DATA  
DTE  
DTE  
DCE  
DTE  
DB37 PIN  
FEMALE  
J1  
XW3A  
XW4A  
XW4B  
XW5A  
POWER  
DSR  
CR10  
CR9 RS-232 TO RS-422 DTR/DSR  
CTS  
CR4 RS-232 TO RS-422 RTS/CTS  
CR7 RS-232 TO RS-422 DATA  
OFF <-> ON  
S1  
DB25 PIN  
FEMALE  
DCE  
J2  
DATA  
XW5B  
RS-232 INTERFACE  
SET TO DTE  
Figure 3-2. Sample DIP-Shunt Setting.  
Figure 3-2 shows the DIP-shunt settings used for an application like the one illustrated in  
Figure 3-3a.  
NOTE  
The filled-in rectangles in Figure 3-2 indicate the jumpers that contain a DIP-shunt.  
CAUTION  
Never set both ports the same: the clocks will not operate correctly. If two DTEs are  
connected through the Converter, a modem eliminator is required in order to avoid  
setting both ports the same. If two DCEs are connected together, a cross-over cable is  
required.  
10  
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RS-232RS-422 INTERFACE CONVERTER  
Figures 3-3a and 3-3b show some typical synchronous applications.  
DIP SHUNT SETTINGS  
RS-232  
DTE  
RS-422  
DCE  
INTERFACE  
CONVERTER  
RS-232 MODEM  
OR MODEM  
ELIMINATOR  
RS-232  
TERMINAL  
DIP SHUNT SETTINGS  
RS-232  
DCE  
RS-422  
DTE  
INTERFACE  
CONVERTER  
RS-232 MODEM  
OR MODEM  
ELIMINATOR  
PC  
Figure 3-3. Synchronous Applications.  
Applications involving asynchronous devices are also possible. Figure 3-4 illustrates a popular  
asynchronous setup, while Figure 3-5 shows the cabling involved.  
DIP-SHUNT  
SETTINGS:  
22 (T+)  
4 (T-)  
R+  
R-  
DCE  
DTE  
24 (R+)  
6 (R-)  
T+  
DB25  
STRAIGHT  
CABLE  
RS-232/RS-422  
INTERFACE  
CONVERTER  
T-  
RS-422  
DEVICE  
PC OR OTHER  
DTE DEVICE  
19 (FRAME  
GND)  
GND  
(GROUND  
OPTIONAL)  
Figure 3-4. RS-422 Asynchronous Application.  
11  
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RS-232RS-422 INTERFACE CONVERTER  
THE RECEIVER TERMINATION SWITCH  
This switch is marked S1 on the printed circuit-board diagram in Figures 3-1 and 3-2. This switch serves  
to terminate the receiver with pull-up and pull-down resistors in order to designate the receiver state and  
enable the Converter’s anti-streaming function. Setting the switch to the ON position closes the switch,  
setting the switch to OFF opens the switch.  
3.2 LEDs  
The RS-232RS-422 Interface Converter is equipped with seven LEDs located on the front panel that  
indicate the status of INPUT signals.  
The three LEDs on the right side of the front panel show conditions on the RS-232 interface: DSR  
(Data Set Ready), CTS (Clear To Send), and Data.  
The three LEDs on the left side of the panel show the same conditions on the RS-422 interface: DSR  
(Data Set Ready), CTS (Clear To Send), and Data.  
The LED labeled PWR, located in the center of the front panel, indicates when power is applied to  
the unit.  
Figures 3-5 and 3-6 illustrate signal flow in both the DTE and DCE configurations.  
NOTE  
Some LEDs may be lit when no input signal is present. This is not a malfunction, but a  
floating state condition at the input that causes the output of that driver to indicate a  
positive voltage condition.  
12  
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RS-232RS-422 INTERFACE CONVERTER  
RS-232 RS-422 Signal Flow Diagram  
(Arrows indicate the direction of signal flow.)  
RS-232  
(Port is DTE)  
RS-422  
(Port is DCE)  
SW1 A  
CR6  
(RS-422 DATA LED)  
(RS-232 DATA LED)  
4
Send Data A (-)  
TD  
2
3
22 Send Data B (+)  
Receive Data A (-)  
24 Receive Data B (+)  
Request to Send A (-)  
25 Request to Send B (+)  
Clear to Send A (-)  
SW1 B  
CR7  
6
RD  
CR5  
CR4  
CR9  
(RS-422 CTS LED)  
(RS-232 CTS LED)  
(RS-232 DSR LED)  
7
4
5
6
RTS  
CTS  
9
27 Clear to Send B (+)  
11 Data Mode A (-)  
29 Data Mode B (+)  
DSR  
CD  
13 Receiver Ready A (-)  
31 Receiver Ready B (+)  
8
5
Send Timing A (-)  
TXC 15  
RXC 17  
23 Send Timing B (+)  
8
Receive Timing A (-)  
26 Receive Timing B (+)  
12 Terminal Ready A (-)  
CR8  
(RS-422 DSR LED)  
20  
DTR  
Terminal Ready B (+)  
30  
17 Terminal Timing A (-)  
35  
ETXC 24  
Terminal Timing B (+)  
Chassis  
GND  
Chassis or Frame  
1
7
1
GND  
GND  
Optional Jumper  
*
19 Signal GND  
20 Receive Common  
Signal  
GND  
37  
Transmit Common  
* Note: The optional jumper is removed (factory default  
Figure 3-5. Signal Flow Diagram A.  
13  
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RS-232RS-422 INTERFACE CONVERTER  
RS-232 RS-422 Signal Flow Diagram  
(Arrows indicate the direction of signal flow.)  
RS-232  
(Port is DCE)  
RS-422  
(Port is DTE)  
CR7  
(RS-232 DATA LED)  
(RS-422 DATA LED)  
4
Send Data A (-)  
TD  
2
3
22 Send Data B (+)  
Receive Data A (-)  
24 Receive Data B (+)  
Request to Send A (-)  
25 Request to Send B (+)  
Clear to Send A (-)  
SW1 B  
SW1 A  
CR6  
6
RD  
CR4  
CR5  
(RS-232 CTS LED)  
(RS-422 CTS LED)  
7
4
5
6
RTS  
CTS  
9
27 Clear to Send B (+)  
CR8  
(RS-422 DSR LED)  
11 Data Mode A (-)  
29 Data Mode B (+)  
DSR  
CD  
13 Receiver Ready A (-)  
31 Receiver Ready B (+)  
8
5
Send Timing A (-)  
TXC 15  
RXC 17  
23 Send Timing B (+)  
8
Receive Timing A (-)  
26 Receive Timing B (+)  
12 Terminal Ready A (-)  
CR9  
(RS-232 DSR LED)  
20  
DTR  
Terminal Ready B (+)  
30  
17 Terminal Timing A (-)  
35  
ETXC 24  
Terminal Timing B (+)  
Chassis  
GND  
Chassis or Frame  
1
1
7
GND  
GND  
Optional Jumper  
*
19 Signal GND  
20 Receive Common  
Signal  
GND  
37  
Transmit Common  
* Note: The optional jumper is removed (factory default  
Figure 3-6. Signal Flow Diagram B.  
14  
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RS-232RS-422 INTERFACE CONVERTER  
4. Ground Strap and Interface Pinouts  
Signal grounds (Pins 19, 20, and 37 on the RS-422 interface and Pin 7 on the RS-232 interface) are  
connected together, but not connected to chassis ground (Pin 1). However, for applications requiring all  
grounds to be at a common reference point, these pins can be connected to chassis ground by installing  
a jumper strap across W6 located at the rear of the printed-circuit board between J1 and P1 (refer to  
Figures 4-1 and 4-2).  
PROTECTIVE GROUND  
1
2
14  
SECONDARY TRANSMITTED DATA  
TRANSMITTED DATA  
DCE TRANSMITTER SIGNAL ELEMENT TIMING 15  
3 RECEIVED DATA  
SECONDARY RECEIVED DATA  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
4 REQUEST TO SEND  
RECEIVER SIGNAL ELEMENT TIMING  
5 CLEAR TO SEND  
DATA SET READY  
6
7
8
SECONDARY REQUEST TO SEND  
DATA TERMINAL READY  
SIGNAL GROUND/COMMON RETURN  
RECEIVED LINE SIGNAL DETECTOR  
+ VOLTAGE  
SIGNAL QUALITY DETECTOR  
9
RING INDICATOR  
-VOLTAGE  
10  
11  
12  
13  
DATA SIGNAL RATE SELECTOR  
DTE TRANSMITTER SIGNAL ELEMENT TIMING  
SECONDARY RECEIVED LINE SIGNAL  
DETECTOR  
SECONDARY CLEAR TO SEND  
Figure 4-1. The RS-232 Interface.  
1
2
3
4
5
6
7
8
9
SHIELD  
RECEIVE COMMON  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
SIGNALING RATE INDICATOR  
(+B) SEND DATA  
(+B) SEND TIMING  
SEND DATA (-A)  
SEND TIMING (-A)  
RECEIVE DATA (-A)  
REQUEST TO SEND (-A)  
RECEIVE TIMING (-A)  
CLEAR TO SEND (-A)  
(+B) RECEIVE DATA  
(+B) REQUEST TO SEND  
(+B) RECEIVE TIMING  
(+B) CLEAR TO SEND  
TERMINAL IN SERVICE  
(+B) DATA MODE  
10 LOCAL LOOPBACK  
DATA MODE (-A)  
11  
12  
13  
14  
15  
16  
17  
18  
19  
(+B) TERMINAL READY  
(+B) RECEIVER READY  
TERMINAL READY (-A)  
RECEIVER READY (-A)  
REMOTE LOOPBACK  
INCOMING CALL  
SELECT FREQUENCY  
TERMINAL TIMING (-A)  
TEST MODE  
SELECT STANDBY 32  
SIGNAL QUALITY 33  
NEW SIGNAL  
(+B) TERMINAL TIMING  
STANDBY/INDICATOR  
SEND COMMON  
34  
35  
36  
37  
SIGNAL GROUND  
Figure 4-2. The RS-422 Interface.  
15  
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© Copyright 1998. Black Box Corporation. All rights reserved.  
1000 Park Drive Lawrence, PA 15055-1018 724-746-5500  
Fax 724-746-0746  
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