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21) COMC/COMD (Serial Port Headers)
Each COM header can provide one serial port via an optional COM port cable. For purchasing the optional
COM port cable, please contact the local dealer. The two headers support RS232, RS422, and RS485
devices.
10
9
2
1
Pin No.
Definition
1
NDCD-
2
NDSR-
3
NSIN
4
NRTS-
5
NSOUT
6
NCTS-
7
NDTR-
8
+5V/+12V
9
GND
10
NC
For RS232 Devices:
Pin No.
Definition
1
TX(B)
2
NC
3
TX(A)
4
NC
5
RX(A)
6
NC
7
RX(B)
8
+5V/+12V
9
GND
10
NC
For RS422 Devices:
Pin No.
Definition
1
D-
2
NC
3
D+
4
NC
5
NC
6
NC
7
NC
8
+5V/+12V
9
GND
10
NC
For RS485 Devices:
22) COMA_PW/COMB_PW/COMC_PW/COMD_PW (Serial Port Header Power Select
Jumpers)
The power select jumpers are used to select serial port power.
1-2 Close: Set to 12V.
2-3 Close: Set to 5V. (Default)
1
1
23) SMBUS (System Management Bus)
Pin No.
Definition
1
SMB_CLK
2
SMB_DATA
3
GND
1
