MSI MS-98E3 Manual page 17

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Serial Port Connector: COM1/ COM2
The serial port is a 16550A high speed communications port that sends/
receives 16 bytes FIFOs. You can attach a serial mouse or other serial
devices directly to the connector. COM1 supports RS-232/422/485.
RS-232
PIN
1
2
3
4
5
6
7
8
9
RS-422
PIN
1
2
3
4
5
6
7
8
9
RS-485
PIN
1
2
3
4
5
6
7
8
9
SIGNAL DESCRIPTION
DCD Data Carrier Detect
RXD Receive Data
TXD Transmit Data
DTR Data Terminal Ready
GND Signal Ground
DSR Data Set Ready
RTS Request To Send
CTS Clear To Send
VCC_COM1 Voltage select setting by
JCOMP1
SIGNAL DESCRIPTION
422 TXD- Transmit Data, Negative
422 RXD+ Receive Data, Positive
422 TXD+ Transmit Data, Positive
422 RXD- Receive Data, Negative
GND Signal Ground
NC No Connection
NC No Connection
NC No Connection
NC No Connection
SIGNAL DESCRIPTION
485 TXD- Transmit Data, Negative
NC No Connection
485 TXD+ Transmit Data, Positive
NC No Connection
GND Signal Ground
NC No Connection
NC No Connection
NC No Connection
NC No Connection
MS-98E3
2-5