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ASYNC 232↔422/485 CONVERTER
S1-4: Echo Mode
S1-5: Carrier-Control Method
NOTE
Carrier is ON when RTS is asserted positive, and OFF only when RTS is
driven to a negative voltage.
S1-6: Receive Impedance (Termination)
S1-7 and S1-8: 2-wire/4-wire Modes