Advantech AIMB-250 user manual Serial Port 1 Connector in RS-232 Mode CN1, User’s Manual, Signal

				User’s Manual
2.4.8 Serial Port 1 Connector in RS-232 Mode (CN1)
	Signal	PIN	PIN	Signal
	DCD	1	2	RxD
	TxD	3	4	DTR
	GND	5	6	DSR
	RTS	7	8	CTS
	RI/+5V/+12V	9	10	NC

2.4.8.1 Signal Description – Serial Port 1 Connector in RS-232 Mode (CN1)

Signal		Signal Description
		Serial output. This signal sends serial data to the communication link. The signal is
TxD		set to a marking state on hardware reset when the transmitter is empty or when
		loop mode operation is initiated.
RxD	Serial input. This signal receives serial data from the communication link.
DTR		Data Terminal Ready. This signal indicates to the modem or data set that the
		on-board UART is ready to establish a communication link.
DSR		Data Set Ready. This signal indicates that the modem or data set is ready to
		establish a communication link.
RTS		Request To Send. This signal indicates to the modem or data set that the on-board
		UART is ready to exchange data.
CTS		Clear To Send. This signal indicates that the modem or data set is ready to
		exchange data.
DCD		Data Carrier Detect. This signal indicates that the modem or data set has detected
		the data carrier.
RI		Ring Indicator. This signal indicates that the modem has received a telephone
		ringing signal.

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