MSI MS-9A69-A1, Руководство пользователя, Страница: 13 / 72

1-5
Overview MS-9A69-U Series
3
RS232/422/485 Serial Port: COM1 ~ COM2
The serial port is a 16550A high speed communications port that sends/
receives 16 bytes FIFOs. It supports barcode scanners, barcode printers, bill
printers, credit card machine, etc.
1 5
6 9
RS232
PIN SIGNAL DESCRIPTION
1
2
3
4
5
6
7
8
9
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
POWER
Data Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Ground
Data Set Ready
Request To Send
Clear To Send
5V or 12V selected by GPIO (BIOS)
RS422
PIN SIGNAL DESCRIPTION
1
2
3
4
5
6
7
8
9
TXD-
TXD+
RXD+
RXD-
GND
NC
NC
NC
NC
Transmit Data, Negative
Transmit Data, Positive
Receive Data, Positive
Receive Data, Negative
Ground
No Connection
No Connection
No Connection
No Connection
RS485
PIN SIGNAL DESCRIPTION
1
2
3
4
5
6
7
8
9
D-
D+
NC
NC
GND
NC
NC
NC
NC
Data, Negative
Data, Positive
No Connection
No Connection
Ground
No Connection
No Connection
No Connection
No Connection
4
Power Button
Press the button to turn the system on or off.
5
Microphone Jack
This connector is provided for microphones.