Gigabyte MVBAYAI - Page 20

Hardware Installation
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11/12) COM3/COM4 (Serial Port 3/4 Cable Connectors)
JCOM3
COM3
COM4
1
9
2
10
PinNo. Denition
1 NRXD3-
2 NDCD3-
3 NDTR3-
4 NTXD3-
5 NDSR3-
6 GND
7 NCTS3-
8 NRTS3-
9 NC
10 RI3-/1.5V/12V
PinNo. Denition
1 NRXD4-
2 NDCD4-
3 NDTR4-
4 NTXD4-
5 NDSR4-
6 GND
7 NCTS4-
8 NRTS4-
9 NC
10 NRI4-
COM3/COM4
COM3 COM4
2
6
1
5
2
6
1
5
2
6
1
5
1-2 Close: 5V (Power COM)
3-4 Close: RI (STAND COM)
5-6 Close: 12V (Power COM)
PinNo. Denition
1 +5V
2 GND
3 NRI3-(RI#)
4 GND
5 +12V
6 GND
13) JCOM3 (5V/12V/RI Signal Select Header for Serial Port 3)