9. Jumpers and Connectors Overview
28
PCI-960 – User’s Manual (V1.02)
9.1.3.15.
J11: Serial Port Connector COM2
The 10-pin box header is to be used with the supplied serial cable. This interface is RS232 (default) and can be
configured as RS422 or RS485 (BIOS Setup).
For RS422 and RS485 mode, please install the jumper caps (JP7 and JP8) to use the onboard
termination resistors (120ohm).
RS232 mode (default)
RS422 point-to-point mode:
The RX signal is always enabled via application software.
RS485 party line mode:
The RX signal is enabled when COM2 RTS is deasserted via application software.
The TX signal is enabled when COM2 RTS is asserted via application software.
COM2-pin assignment as RS232 (default):
J11: Boxed Header,
DIP 10-pin
RS232
(Pinning on the on-board header)
D-SUB
Connector
Pin #
Signal Name
1
DCD, Data carrier detect
2
DSR, Data set ready
3
RxD, Receive data
4
RTS, Request to send
5
TxXD, Transmit data
6
CTS, Clear to send
7
DTR, Data terminal ready
8
RI, Ring indicator
9 GND,
ground
1
9
2
10
COM2
(J11)
10
12 V, fused
Pining on the
supplied cable
connector:
COM2 pin assignment as RS422:
J11: Boxed Header,
DIP 10-pin
RS422
(Pinning on the on-board header)
D-SUB
Connector
Pin #
Signal Name
1 NC
2 NC
3
RxD–, Receive data
4
RxD+, Receive data
5
TxD–, Transmit data
6
TxD+, Transmit data
7 NC
8 NC
9 GND,
ground
1
9
2
10
COM2
(J11)
10
12 V fused
Pining on the
supplied cable
connector:
RXD–
TXD–
TXD+
RXD+
