RS-423 means Recommended Standard 423
EIA standard for transmitting serial data in
Electronics
Similar to RS-423
4W - 4-Watt Resistor
4WA - Four Wire Analog
4WAI - 4-Wire Analog Interface
4WH - Four Watt-Hour capacity
4WJ - Four-Way Junction
4WM - Four Wave Mixing
A - form A
normally open contacts
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