RS-422 means Recommended Standard 422
ANSI/EIA standard for transmitting serial data in
Electronics
Similar to RS-422
3SR - Three Station Rotating
4P4T - Quad-Pole Quad-Throw
4W - 4-Watt Resistor
4WA - Four Wire Analog
4WAI - 4-Wire Analog Interface
4WH - Four Watt-Hour capacity
4WJ - Four-Way Junction
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