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724-746-5500 | blackbox.com Page 323
RS-422 uses a full duplex transmit on TX+ (Transmit Data +) / TX- (Transmit Data -) pair, receive on RX+ (Receive Data +) /
RX- (Receive Data –) pair.
RS-485 uses half duplex over single pair. For RS-485 which is a 2-wire bus that drives D+ and D- from a native 4-wire
interface you need to loop 3-6 and 2-7 on the DB-9.
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