DFI SR330-N - Manual (Page 27)

27
2
Hardware Installation
COM 2 is an RS232 port. If the serial device connected to this port
requires 5V/12V power from the system board, set JP4 pins 3-5
and 4-6 to On. Otherwise, leave this jumper’s setting at 1-3, 2-4 On.
The table below list the pin assignment of JP4.
COM 2 RS232/AUX Select
3-5 (5V),
4-6 (12V) On:
Auxiliary power
1-3, 2-4 On:
RS232
(default)
X
JP4
3 1
4
5
2 6
3 1
4
5
2 6
1
3
5
MRIX-
X_MRIX-
+5V
2
4
6
MDCDX-
X_MDCDX-
+12V