Instruction manual

2-12
845 GM/GLM/GEM/PEM/GVM series M-ATX Mainboard
Serial Port Connectors: COMA & JCOM2 (Optional)
The mainboard offers one 9-pin male DIN connector as serial port COM
A, and one optional serial port JCOM2. All ports are 16550A high speed
communication ports that send/receive 16 bytes FIFOs. You can attach a se-
rial mouse or other serial device directly to them.
PIN SIGNAL DESCRIPTION
1 DCD Data Carry Detect
2 SIN Serial In or Receive Data
3 SOUT Serial Out or Transmit Data
4 DTR Data Terminal Ready)
5 GND Ground
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indicate
Pin Definition
RJ-45 LAN Jack (Optional)
The mainboard provides one standard RJ-45 jack for connection to Lo-
cal Area Network (LAN). You can connect a network cable to the LAN jack.
Pin Definition
PIN SIGNAL DESCRIPTION
1 TDP Transmit Differential Pair
2 TDN Transmit Differential Pair
3 RDP Receive Differential Pair
4 NC Not Used
5 NC Not Used
6 RDN Receive Differential Pair
7 NC Not Used
8 NC Not Used
RJ-45 LAN Jack
JCOM2
1
2
9
9-Pin Male DIN Connector
1 2 3 4 5
6 7 8 9