FEBRUARY 1998 IC456A-R3 IC456C-R3 IC456A-R4 IC456C-R4 RS-232↔RS-422 Interface Converter 232 TA DSR CTS DA CUSTOMER SUPPORT INFORMATION RR PWR 422 TA 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 Web site: www.blackbox.com • E-mail: info@blackbox.
RS-232↔RS-422 INTERFACE CONVERTER FEDERAL COMMUNICATIONS COMMISSION AND INDUSTRY CANADA RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates, uses, and can radiate radio-frequency energy, and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication.
RS-232↔RS-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.
RS-232↔RS-422 INTERFACE CONVERTER TRADEMARKS USED IN THIS MANUAL Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.
RS-232↔RS-422 INTERFACE CONVERTER Contents Chapter Page 1.Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RS-232↔RS-422 INTERFACE CONVERTER 1. Specifications Speed — 64,000 bps, max. Connectors — RS-232 port: DB25 female; RS-422 port: DB37 female Indicators — 7 LEDs show status of RS-232 and RS-422 signals and indicate power ON.
RS-232↔RS-422 INTERFACE CONVERTER 2. Introduction The RS-232↔RS-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.
RS-232↔RS-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.
RS-232↔RS-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.
RS-232↔RS-422 INTERFACE CONVERTER RACK POWER CONNECTOR AC POWER CONNECTOR XW1A XW2A RS-422 CONNECTOR RS-232 CONNECTOR XW3A XW4A XW4B XW5A XW5B DIP SHUNTS XW1B XW2B XW3B DIP SHUNTS S1 CR8 CR5 CR6 DSR CTS DATA RS-422 INDICATORS CR10 CR9 CR4 CR7 POWER DSR CTS DATA RS-232 INDICATORS Figure 3-1. Board Layout Showing Component Locations. (Dashed Lines show DTE/DCE DIP Shunt Locations.
RS-232↔RS-422 INTERFACE CONVERTER RS-422 INTERFACE SET TO DCE DSR CTS CR8 RS-422 TO RS-232 DTR/DSR P1 DTE DCE CR5 RS-422 TO RS-232 RTS/CTS XW1A XW1B DATA CR6 RS-422 TO RS-232 DATA DTE DCE XW2A XW2B DCE DTE XW3B POWER XW3A J1 DB37 PIN FEMALE DTE CR10 XW4A DCE XW4B DSR CR9 RS-232 TO RS-422 DTR/DSR CTS CR4 RS-232 TO RS-422 RTS/CTS DATA DTE XW5A OFF <-> ON DCE CR7 RS-232 TO RS-422 DATA J2 DB25 PIN FEMALE XW5B S1 RS-232 INTERFACE SET TO DTE Figure 3-2. Sample DIP-Shunt Setting.
RS-232↔RS-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.
RS-232↔RS-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.
RS-232↔RS-422 INTERFACE CONVERTER ↔ RS-232 <--> RS-422 Signal Flow Diagram (Arrows indicate the direction of signal flow.
RS-232↔RS-422 INTERFACE CONVERTER ↔ RS-232 <--> RS-422 Signal Flow Diagram (Arrows indicate the direction of signal flow.
RS-232↔RS-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).
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