RS-422 means Recommended Standard 422
ANSI/EIA standard for transmitting serial data in
Electronics
Similar to RS-422
ACS - Adjacent Channel Selectivity
ACT - Alternative Control Technique
ACT - Actual Cycle Time
ACT - Akebono Ceramic Technology
ACT - Air Cooled Triode
ACTM - Accelerated Corrosion Testing Method
ADAC - Advanced Digital Acoustic Coding
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