Assessments - 4, GPA: 3.8
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(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” 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-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 por...
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receptor e amplificador - IC107A-R3 (162.14 kb)