In order to increase the baud rate and maximum distance, the balanced differential lineprotocols were introduced. The RS422 signal is encoded in a differential signal, A-B.There are many RS422 interface chips, for example, SP301 or MAX13433. A full duplexRS422 channel is implemented in Figure 7.9 with MAX13433 drivers. Often terminatingresistors are placed at the ends of long cables. E.g., we can place a 100 resistor atacross the A’ B’ inputs.
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