Black Box IC107AE-R3, IC107C-R3, IC107A-R3 manual Table A-2. Pinning of the RS-422/485 connector

RS-232↔RS-422/485 CONVERTER (DATA ONLY)

	Table A-2. Pinning of the RS-422/485 connector
	(4-position terminal block).
Pin/Signal	Function
TXA and TXB	Data received by the Converter from the RS-232 port is
	transmitted out of the unit over twisted-pair wires using
	these two outputs. The “TX” LED indicates the state of these
	two leads. When the TXA lead is positive with respect to the
	TXB lead (a zero is being transmitted), the “TX” LED is lit.
RXA and RXB	These are the received data inputs for the RS-422/485 port.
	The status of these leads is monitored by the “RX” LED.
	When the RXA lead is positive with respect to the RXB lead
	(a zero is being received), the “RX” LED is lit.

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