Intel I815E user manual J15, J12 COM1 / COM2 Serial Ports, Pin # Signal Name RS-232 R2-422 RS-485

INSTALLATIONS

J15, J12: COM1 / COM2 Serial Ports

J15 (COM1) is a DB-9 connector, while J12 (COM2) is a 10-pin header. Refer to the table below for their pin assignments.

COM1		COM2
Signal Name	Pin #	Pin #	Signal Name
DCD, Data carrier detect	1	6	DSR, Data set ready
RXD, Receive data	2	7	RTS, Request to send
TXD, Transmit data	3	8	CTS, Clear to send
DTR, Data terminal ready	4	9	RI, Ring indicator
Ground	5	10	Not Used

J12 (COM2) is jumper selectable for RS-232, RS-422 and RS-485.

Pin #		Signal Name
	RS-232	R2-422	RS-485
1	DCD	TX-	DATA-
2	RX	TX+	DATA+
3	TX	RX+	NC
4	DTR	RX-	NC
5	Ground	Ground	Ground
6	DSR	RTS-	NC
7	RTS	RTS+	NC
8	CTS	CTS+	NC
9	RI	CTS-	NC
10	NC	NC	NC

I815E User’s Manual 21