MSI 845GEM-L User Guide - Page 28

Serial Port Connectors: COMA & JCOM2 Optional, RJ-45 LAN Jack Optional

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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 serial mouse or other serial device directly to them. 1 2 3 4 5 Pin Definition PIN SIGNAL 1 6 7 8 9 2 3 9-Pin Male DIN Connector 4 5 6 9 1 7 2 8 9 JCOM2 DCD SIN SOUT DTR GND DSR RTS CTS RI DESCRIPTION Data Carry Detect Serial In or Receive Data Serial Out or Transmit Data Data Terminal Ready) Ground Data Set Ready Request To Send Clear To Send Ring Indicate RJ-45 LAN Jack (Optional) The mainboard provides one standard RJ-45 jack for connection to Local Area Network (LAN). You can connect a network cable to the LAN jack. RJ-45 LAN Jack Pin Definition PIN SIGNAL 1 TDP 2 TDN 3 RDP 4 NC 5 NC 6 RDN 7 NC 8 NC DESCRIPTION Transmit Differential Pair Transmit Differential Pair Receive Differential Pair Not Used Not Used Receive Differential Pair Not Used Not Used 2-12

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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