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THE RS-422 STANDARDLike RS-423, the RS-422 standard defines a uni-directional interface for up to 10 receivers but the electronics are designed differently. Instead of referencing the data voltage level to earth ground, the data signal voltages are defined as the difference in voltage between a pair of wires. Because of the use of a "balanced" circuit, the problems of Common Mode Voltage differences are reduced. This requires one additional wire in the interface. The advantage of the more sophisticated electrical interface is that RS-422 can be used with data rates up to 10 Mbits/sec. That’s a significant improvement over the 10 Kb/sec maximum data rate for RS-423. |
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