Intel user manual ECB-865User’s Manual, Signal

ECB-865

3.11.17Box Header Serial Port 1 / Serial Port 2 Connector in RS-422 (J9, J12)

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

3.11.18Signal Description – Serial Port 1 / Serial Port 2 in RS-422 Mode (J9, J12)

TxD +/-	Serial output. This differential signal pair sends serial data to the communication link. Data is
	transferred from Serial Port 2 Transmit Buffer Register to the communication link, if the TxD
	line driver is enabled through the Serial Port 2’s DTR signal. (Modem control register)
RxD +/-	Serial input. This differential signal pair receives serial data from the communication link.
	Received data is available in Serial Port 2 Receiver Buffer Register.
RTS +/-	Request To Send. The level of this differential signal pair output is controlled through
	the Serial Port 2’s RTS signal (Modem control register).
CTS +/-	Clear To Send. The level of this differential signal pair input could be read from the Serial Port
	2’s CTS signal. (Modem control register)

3.11.19Box Header Serial Port 1 / Serial Port 2 Connector in RS-485 (J9, J12)

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

ECB-865 User’s Manual 37