Chapter 1: Introduction
| 5
1.4
Rear Panel Connectors
Standard
*
*
Optional
*
*
COM1/COM2 Connector
Pin Assignment
Pin Assignment
1
Carrier detect (DCD)
6
Data set ready (DSR)
2
Received data (RXD)
7
Request to send (RTS)
3
Transmitted data (TXD)
8
Clear to send (CTS)
4
Data terminal ready (DTR) 9
Ring / 5V / 12V *
5
Signal ground (GND)
Note
COM1/2 voltage selection is controlled by BIOS setup. Please see page-29 for detail setting.
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KBMSJP: 5V/ 5V_DUAL Power Switch Header for PS/2* & USB* connector
This header is for switching between 5V and 5V dual power.
1
3
1
3
Pin 1-2 Close: 5V (Default)
1
3
Pin 2-3 Close: 5V_Dual
If EuP is enabled in BIOS, 5V Dual will be
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disabled when system power-off.
