Serial Port Connector: Com1 & Com2; Usb Connectors - MSI 915GM User Manual

Serial Port Connector: COM1 & COM2
The mainboard offers one 9-pin male DIN connector COM A, and one optional
serial header COM2. Both are 16550A high speed communication ports that send/
receive/ 16 bytes FIFOs. You can attach a serial mouse or other serial device directly
to them.
1 2 3 4 5
6 7 8 9
9-Pin Male DIN Connector
COM1
PIN
1
2
3
4
5
6
7
8
9

USB Connectors

The mainboard provides an OHCI (Open Host Controller Interface) Universal
Serial Bus root for attaching USB devices such as keyboard, mouse or other USB-
compatible devices. You can plug the USB device directly into the connector.
1 2 3 4
5 6 7 8
USB Ports
10
9
COM2
Pin Definition
SIGNAL DESCRIPTION
DCD Data Carry Detect
SIN Serial In or Receive Data
SOUT Serial Out or Transmit Data
DTR Data T erminal Ready)
GND Ground
DSR Data Set Ready
RTS Request T o Send
CTS Clear To Send
RI Ring Indicate
USB Port Description
PIN SIGNAL DESCRIPTION
1 VCC +5V
2 -Data 0 Negative Data Channel 0
3 +Data0 Positive Data Channel 0
4 GND Ground
5 VCC +5V
6 -Data 1 Negative Data Channel 1
7 +Data 1 Positive Data Channel 1
8 GND Ground
Hardware Setup
2
1
2-11