Black Box Cable Box IC107AE R3 User Manual

DECEMBER 2001  
IC107A-R3  
IC107AE-R3  
IC107C-R3  
RS-232RS-422/485 Converter  
(Data Only)  
CUSTOMER  
SUPPORT  
INFORMATION  
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  
 
RS-232RS-422/485 CONVERTER (DATA ONLY)  
NORMAS OFICIALES MEXICANAS (NOM)  
ELECTRICAL SAFETY STATEMENT  
INSTRUCCIONES DE SEGURIDAD  
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.  
2
 
NOM STATEMENT, TRADEMARKS  
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.  
TRADEMARKS USED IN THIS MANUAL  
BLACK BOX and the  
Corporation.  
logo are registered trademarks of Black Box  
Any other trademarks mentioned in this manual are acknowledged to be the property of the  
trademark owners.  
3
 
RS-232RS-422/485 CONVERTER (DATA ONLY)  
Contents  
Chapter  
Page  
1. Specifications ............................................................................................. 5  
2. Introduction ............................................................................................... 7  
3. Configuration ............................................................................................. 8  
4. Installation ................................................................................................ 10  
5. Operation ................................................................................................. 11  
5.1 RS-232 Circuitry ................................................................................ 11  
5.2 RS-422/485 Circuitry ........................................................................ 13  
6. Troubleshooting ...................................................................................... 14  
6.1 Calling Black Box .............................................................................. 14  
6.2 Shipping and Packaging ................................................................... 14  
Appendix: Pinouts .......................................................................................... 15  
4
 
CHAPTER 1: Specifications  
1. Specifications  
Compliance:  
Interfaces:  
CE; FCC Part 15 Subpart B Class A, IC Class/classe A  
EIA/TIA RS-232, DTE or DCE (user-selectable);  
EIA/TIA RS-422/485  
Protocol:  
Asynchronous  
Data Rate:  
Transparent to data rates up to 64 kbps  
Transparent to data format  
Data Format:  
Flow Control:  
Transparent to software flow control; holds RS-232  
hardware flow-control outputs high, but can be set so  
that RS-232 hardware flow-control inputs (DTR or RTS)  
enable the RS-422/485 driver  
Operation:  
RS-422/485: 4-wire full duplex, point-to-point or  
multipoint  
Maximum Distance: RS-232: 50 ft. (15.2 m) to attached device  
RS-422/485: 4000 ft. (1219.2 m) to farthest attached  
device  
User Controls:  
All board-mounted;  
(1) 8-position DIP-switch jumper for DTE vs. DCE;  
(1) 1-position DIP switch for RS-422/485 termination;  
(1) Jumper for RS-422/485 always ON vs. controlled;  
(1) Jumper for RS-422/485 controlled by DTR vs. RTS;  
(1) Jumper/solder terminal for interconnection of frame  
ground and RS-232 signal ground  
Indicators:  
(3) Front-mounted LEDs: TX, RX, POWER  
Connectors:  
RS-232: (1) DB25 female;  
RS-422/485: (1) 4-position terminal block  
Leads/Signals  
Supported:  
RS-232: Pins 1 through 8 and 20 (PGND, TD, RD, RTS,  
CTS, DSR, SGND, DCD, and DTR);  
RS-422/485: TXA, TXB, RXA, RXB;  
For additional information, see the Appendix  
5
 
RS-232RS-422/485 CONVERTER (DATA ONLY)  
Temperature  
Tolerance:  
Operating: 32 to 122˚F (0 to 50˚C)  
Storage: –4 to +158˚F (–20 to +70˚C)  
Humidity  
Tolerance:  
Up to 95% noncondensing  
200,000 hours  
MTBF:  
Power:  
IC107A-R3 and IC107AE-R3: From utility-power (mains)  
outlet, through external power supply with detachable  
region-specific input cord:  
Input:  
IC107A-R3: 120 VAC, 60 Hz;  
IC107AE-R3: 230 VAC, 50 Hz;  
Output:  
IC107A-R3: 17 VDC CT at 700 mA;  
IC107AE-R3: 17 VDC CT at 750 mA;  
IC107C-R3: 17 VDC CT at 700 mA from the RM005 rack  
Size:  
IC107A-R3 and IC107AE-R3: 1.75"H (1U) x 5.5"W x 9"D  
(4.4 x 14 x 22.9 cm);  
IC107C-R3: 4.7"H x 7.4"D (11.9 x 18.8 cm)  
Weight:  
IC107A-R3 and IC107AE-R3 enclosure: 1 lb. (0.5 kg);  
IC107A-R3 and IC107AE-R3 power supply: 0.5 lb. (0.2 kg);  
IC107C-R3: 0.5 lb. (0.2 kg)  
6
 
CHAPTER 2: Introduction  
2. Introduction  
The RS-232RS-422/485 Converter (Data Only) allows your RS-232 and  
RS-422/485 equipment to communicate with each other. It operates in full-duplex  
mode over 4-wire lines.  
A four-wire terminal block on the RS-422/485 port makes installation easy. And  
this interface converter is flexible: it can work in either point-to-point or multipoint  
applications. You can set the RS-232 interface as either Data Terminal Equipment  
(DTE) or Data Communications Equipment (DCE) for a wide range of  
applications. The Converter is available either as a standalone device (product  
code IC107A-R3 for 115-VAC power or IC107AE-R3 for 230-VAC power) or as a  
card (product code IC107C-R3) that can be mounted in an RM005 card-cage rack.  
Figures 2-1 and 2-2 illustrate typical Converter applications. In Figure 2-1, the  
Converter is labeled “terminated”; this indicates that the Converter’s termination  
switch S2 has been set to ON. Also note that although Figure 2-2 shows only two  
interconnected Converters, up to 64 of them can be daisychained in a multipoint  
system. Both figures show the signal flow for the Converter in full-duplex operation  
for both point-to-point and multipoint applications. (Direction of signal flow is  
indicated by arrows.)  
RS-232 <—> RS-422/485  
Interface Converter  
T x A  
R x A  
R x B  
T x A  
RS-232  
Device  
T x B  
R x A  
RS-422/485  
Device  
R x B  
T x B  
Terminated  
Figure 2-1. 4-wire full-duplex point-to-point application.  
Figure 2-2. 4-wire full-duplex multipoint application.  
7
 
RS-232RS-422/485 CONVERTER (DATA ONLY)  
3. Configuration  
Here’s how to configure the RS-232RS-422/485 Converter (Data Only) for your  
application (refer to Figure 3-1 on the next page for the location of components  
on the circuit board):  
CAUTION!  
The Converter’s circuit board can be damaged by static electricity, so take  
every reasonable precaution against it. Always discharge yourself on a  
metal surface before opening the Converter or touching the board; if  
possible, stand on an anti-static mat and wear a grounding strap or anti-  
static gloves.  
1. If your Converter is a standalone IC107A-R3 or IC107AE-R3 model: Open the  
Converter by unscrewing the single screw on the bottom of its case and taking  
the top of the case off.  
2. Set the Converter’s RS-232 port to DTE or DCE as necessary for your  
application. For the RS-232 port to function as a DTE device, put the DIP-  
switch block in jumper socket XW1B. For the RS-232 port to function as a  
DCE device, leave the DIP-switch block in jumper socket XW1A (the factory-  
default setting). Whichever socket the block is in, make sure that all of its  
individual DIP-switch positions are always set to ON.  
3. Set jumper W15 to select how the Converter’s RS-422/485 driver is enabled. If  
you want the driver to be permanently enabled, place the jumper across  
W15’s pins B and C. If you want to use the RS-232 DTR or RTS signal to  
enable the RS-422/485 driver, leave W15 in its factory-default position with  
the jumper across pins A and B. (To have DTR enable the driver, leave  
jumper W18 in its factory-default position with the jumper across pins A and B.  
To have RTS enable the driver, place the W18 jumper across pins B and C.)  
4. Some applications require the RS-422/485 interface to be terminated.  
A resistor network can provide this termination on the Converter at the  
RS-422/485 input receiver pins (RXA and RXB). Use DIP switch S2 to enable  
or disable termination: If you move S2 to the “TERM” position, the resistor  
network is connected across the line, and the RS-422/485 interface is  
terminated. If you leave S2 in its factory-default “UNTERM” position, no  
connection to the resistor network is made, and the interface is not  
terminated.  
8
 
CHAPTER 3: Configuration  
5. Normally, the Converter’s frame ground is isolated from its RS-232 signal  
ground. But if you want to connect frame ground to signal ground, you’ll  
need to solder a 100-ohm, 500-mW resistor to the terminals of location W7.  
(You could also use a wire jumper, but you’d need to make sure that any  
ground-loop currents caused by voltage-potential differences between the  
RS-232 and RS-422/485 sides are limited to acceptable levels—a strong  
ground loop could damage the Converter and attached equipment.)  
CAUTION!  
Any soldering should be done only by qualified, experienced personnel.  
6. If your Converter is a standalone IC107A-R3 or IC107AE-R3 model: Put the top of  
the Converter’s case back on and secure it in place by screwing the bottom  
screw back in.  
Board component plugs  
into RS-422/485 connector  
RS-232 Connector  
Figure 3-1. The Converter’s circuit board.  
9
 
RS-232RS-422/485 CONVERTER (DATA ONLY)  
4. Installation  
To install your RS-232RS-422/485 Converter (Data Only) system, take these  
steps, making sure that the Converter and your devices are powered OFF:  
1. Run an RS-232 cable from your RS-232 device to the Converter’s DB25 female  
RS-232 port.  
2. Run a 4-wire cable from your RS-422 device, or the nearest of your RS-485  
devices, to the Converter’s 4-position RS-422/485 terminal block. Make sure  
to connect the wires running from the device to the appropriate terminals on  
the Converter:  
Device  
TX +  
Converter  
RXB  
TX –  
RXA  
RX +  
RX –  
TXB  
TXA  
3. Plug the Converter into AC power. It will begin operating immediately; it has  
no ON/OFF switch.  
4. Power up your devices.  
Your Converter system should now be ready for continuous operation.  
10  
 
CHAPTER 5: Operation  
5. Operation  
5.1 RS-232 Circuitry  
The RS-232 side of the RS-232RS-422/485 Converter (Data Only) is composed of  
the RS-232 drivers and receivers, the delay circuitry, and other circuitry necessary  
to operate the RS-232 control lines.  
Data traveling from the RS-232 interface to the RS-422/485 interface: When the RS-232  
port is configured as DCE (see Figure 5-1 on the next page), data received on  
RS-232 Pin 2 (TD) will be transmitted out through TXA and TXB on the RS-422/  
485 port. For this transmission, RTS (or DTR, depending on the position of W18)  
must be asserted. In other words, before you can send any data through the  
Converter from the RS-232 side to the RS-422/485 side, one of these conditions  
must be met: Either (1) the RS-232 device must assert RTS/DTR and then receive  
CTS true (that is, ask for and then be given permission to send), or (2) the  
Converter must be set to keep RS-422/485 driver is always enabled (W15 set to the  
B and C position—see step 3 in Chapter 3).  
When the RS-232 port is configured as DTE (see Figure 5-2 on the next page),  
RS-232 Pin 8 (CD) performs the same function as RTS/DTR does for DCE (it asks  
for permission to send). Or, again, you can constantly enable the RS-422/485  
driver by setting the W15 jumper to the B and C position.  
Data going from the RS-422/485 interface to the RS-232 interface: When the RS-232  
interface is configured as DCE, data received on the RXA and RXB pins of the  
RS-422/485 port will be transmitted out Pin 3 (RD) of the RS-232 interface.  
When the RS-232 interface is configured as DTE, data received on RXA and RXB  
pins of the RS-422/485 interface will be sent out Pin 2 (TD) of the RS-232  
interface.  
For more on the Converter’s RS-232 pinning, see the Appendix.  
11  
 
RS-232RS-422/485 CONVERTER (DATA ONLY)  
RS-422/485  
side  
RS-232  
side  
Figure 5-1. Block diagram of Converter functions in DCE mode.  
RS-422/485  
side  
RS-232  
side  
Figure 5-2. Block diagram of Converter functions in DTE mode.  
12  
 
CHAPTER 5: Operation  
5.2 RS-422/485 Circuitry  
The RS-422/485 side of the Converter is made up of the driver, receiver, and line-  
termination networks. As described in Chapter 3, you can use switch S2 to either  
connect the receiver’s termination network to the line (terminate the RS-422/485  
port) or leave it unconnected (unterminated).  
Having the line terminated will reduce distortion and improve the overall signal  
quality in most applications. For point-to-point systems where only two devices are  
connected to the line, each device should have the termination network connected  
to the line. In multipoint applications, only the two devices at the extreme ends of  
the line should have the termination network connected to the line. If any of the  
other converters were configured as “terminated,” the amount of signal distortion  
would increase and probably cause errors in the data being transmitted. For more  
on the RS-422/485 connector pinning, see the Appendix.  
13  
 
RS-232RS-422/485 CONVERTER (DATA ONLY)  
6. Troubleshooting  
6.1 Calling Black Box  
If you determine that your RS-232RS-422/485 Converter (Data Only) is  
malfunctioning, do not attempt to alter or repair the unit. It has no user-serviceable  
components. Contact Black Box Technical Support at 724-746-5500.  
Before you do, make a record of the history of the problem. We will be able to  
provide more efficient and accurate assistance if you have a complete description,  
including:  
• the nature and duration of the problem;  
• when the problem occurs;  
• the components involved in the problem;  
• any particular application that, when used, appears to create the problem or  
make it worse; and  
• the results of any testing you’ve already done.  
6.2 Shipping and Packaging  
If you need to transport or ship your Converter:  
• Package it carefully. We recommend that you use the original container.  
• If you are returning the unit, include everything you received with it. Before  
you ship the unit back to Black Box for repair or return, contact us to get a  
Return Authorization (RA) number.  
14  
 
APPENDIX: Pinouts  
Appendix: Pinouts  
Table A-1. Pinning of the RS-232 connector (DB25 female).  
Pin Number and Signal  
Function  
Pin1 — Frame Ground  
Connects the Converter’s frame ground to the  
frame ground of the RS-232 device.  
Pin 2 — TD  
Pin 3 — RD  
Pin 4 — RTS  
When the Converter is set to DCE, data is received  
on Pin 2 and the TX LED lights up when Pin 2 is a  
“space” (logical zero). When the Converter is set  
for DTE, data is output on Pin 2, in which case the  
RX LED lights up when Pin 2 is a “space.”  
When the Converter is set for DCE, data is output  
on Pin 3. The RX LED lights up when Pin 3 is a  
“space.” When the converter is set for DTE, data is  
received on Pin 3 and the TX LED lights up when  
Pin 3 is a “space.”  
When the Converter is set for DCE, RTS is an input  
which turns on the RS-422/485 driver when true.  
When the Converter is set for DTE, RTS is always  
an output and is always true. (In DTE mode, CD  
controls the RS-422/485 driver.)  
Pin 5 — CTS  
Pin 6 — DSR  
When the Converter is set for DCE, CTS is an  
output that follows the RTS/DTR input. When the  
converter is set for DTE, CTS is not used.  
When the Converter is set for DCE, DSR is true.  
When the Converter is set for DTE, DSR is not  
used.  
Pin 7 — Signal Ground  
Pin 8 — CD  
Connects the signal ground of the Converter to the  
signal ground of the RS-232 device.  
When the Converter is configured DCE, CD is  
always true (and RTS controls the RS-422/485  
driver). When the Converter is set for DTE, CD is  
an input which turns on the RS-422/485 driver  
when true.  
Pin 20 — DTR  
When the Converter is set for DTE, Pin 20 is true.  
15  
 
RS-232RS-422/485 CONVERTER (DATA ONLY)  
Table A-2. Pinning of the RS-422/485 connector  
(4-position terminal block).  
Pin/Signal  
Function  
TXA and TXB  
Data received by the Converter from the RS-232 port is  
transmitted out of the unit over twisted-pair wires using  
these two outputs. The “TX” LED indicates the state of these  
two leads. When the TXA lead is positive with respect to the  
TXB lead (a zero is being transmitted), the “TX” LED is lit.  
RXA and RXB  
These are the received data inputs for the RS-422/485 port.  
The status of these leads is monitored by the “RX” LED.  
When the RXA lead is positive with respect to the RXB lead  
(a zero is being received), the “RX” LED is lit.  
16  
 
NOTES  
 
NOTES  
 
© Copyright 2001. Black Box Corporation. All rights reserved.  
1000 Park Drive  
Lawrence, PA 15055-1018  
724-746-5500  
Fax 724-746-0746  
 

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