Advantech user manual AIMB-250 Series Serial Port 1 Connector in RS-422 Mode CN1

AIMB-250 Series

2.4.9 Serial Port 1 Connector in RS-422 Mode (CN1)

Signal	PIN	PIN	Signal
TxD-	1	2	RxD+
TxD+	3	4	RxD-
GND	5	6	NC
NC	7	8	NC
NC	9	10	NC

2.4.9.1 Signal Description – Serial Port 1 Connector in RS-422 Mode (CN1)

Signal	Signal Description
	Serial output. This differential signal pair sends serial data to the communication
TxD+/-	link. Data is transferred from Serial Port 2 Transmit Buffer Register to the
	communication link, if the RTS register of the Serial Port 2 is set to LOW.
	Serial input. This differential signal pair receives serial data from the
RxD+/-	communication link. Received data is available in Serial Port 2 Receiver Buffer
	Register.

40 AIMB-250 Series User’s Manual