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DECEMBER 2001
IC107A-R3
IC107AE-R3
IC107C-R3
RS-232↔RS-422/485 Converter
(Data Only)
CUSTOMER
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
SUPPORT
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
INFORMATION Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
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FCC/IC RFI STATEMENTS, DECLARATION OF CONFORMITY 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. It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Sub
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RS-232↔RS-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 se
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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, un
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RS-232↔RS-422/485 CONVERTER (DATA ONLY) Contents Chapter Page 1. Specifications ............................................................................................. 5 2. Introduction ............................................................................................... 7 3. Configuration ............................................................................................. 8 4. Installation .............................................................................
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CHAPTER 1: Specifications 1. Specifications Compliance: CE; FCC Part 15 Subpart B Class A, IC Class/classe A Interfaces: 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 Data Format: Transparent to 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 drive
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RS-232↔RS-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 MTBF: 200,000 hours 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
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CHAPTER 2: Introduction 2. Introduction The RS-232↔RS-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 (
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RS-232↔RS-422/485 CONVERTER (DATA ONLY) 3. Configuration Here’s how to configure the RS-232↔RS-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
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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 Conver
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RS-232↔RS-422/485 CONVERTER (DATA ONLY) 4. Installation To install your RS-232↔RS-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 a
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CHAPTER 5: Operation 5. Operation 5.1 RS-232 Circuitry The RS-232 side of the RS-232↔RS-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
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RS-232↔RS-422/485 CONVERTER (DATA ONLY) RS-422/485 RS-232 side side Figure 5-1. Block diagram of Converter functions in DCE mode. RS-422/485 RS-232 side side Figure 5-2. Block diagram of Converter functions in DTE mode. 12
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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 a
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RS-232↔RS-422/485 CONVERTER (DATA ONLY) 6. Troubleshooting 6.1 Calling Black Box If you determine that your RS-232↔RS-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 duratio
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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 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.” Pin 3 — RD When the
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RS-232↔RS-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
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NOTES
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© Copyright 2001. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746
