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(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-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 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 2. Introduction CHAPTER 2: Introduction R x B T x A T x A R x A RS-232 Device RS-422/485 Device T x B T x B R x B R x A Terminated RS-232 <—> RS-422/485 Interface Converter 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 (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.) Figure 2-1. 4-wire full-duplex point-to-point application. Figure 2-2. 4-wire full-duplex multipoint application. 7 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 and wear a grounding strap or antistatic 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...

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