MSI IB-945GC - Manual (Page 29)

2-17
MS-9868
RS-232 Serial Port Connector: COM1, COM2
RS-232/-422/-485 Serial Port Connector: COM3, COM4 (Optional)
This connector is a 16550A high speed communications port that sends/receives
16 bytes FIFOs. You can attach a serial device to it through an optional serial port
bracket.
8.CT
S
3.TX
D
1.DC
D
6.DS
R
5.GN
D
4.DT
R
7.RT
S
2.RX
D
9.RI
RS-232
PIN SIGNAL DESCRIPTION
1
2
3
4
5
6
7
8
9 DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
RI Data Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Signal Ground
Data Set Ready
Request To Send
Clear To Send
Ring Indicate
RS-232
RS-422
8.NC
3.TX
+
1.TX
-
6.NC
5.GN
D
4.RX
-
7.NC
2.RX
+
9.NC
PIN SIGNAL DESCRIPTION
1
2
3
4
5
6
7
8
9 422 TXD-
422 RXD+
422 TXD+
422 RXD-
GND
NC
NC
NC
NC Transmit Data, Negative
Receive Data, Positive
Transmit Data, Positive
Receive Data, Negative
Signal Ground
No Connection
No Connection
No Connection
No Connection
RS-422
RS-485
8.NC
3.DA
TA+
1.DA
TA-
6.NC
5.GN
D
4.NC
7.NC
2.NC
9.NC
PIN SIGNAL DESCRIPTION
1
2
3
4
5
6
7
8
9 485 TXD-
NC
485 TXD+
NC
GND
NC
NC
NC
NC Transmit Data, Negative
No Connection
Transmit Data, Positive
No Connection
Signal Ground
No Connection
No Connection
No Connection
No Connection
RS-485