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RS232/422/485 Serial Port
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 1
6 6
RS232
PIN
SIGNAL
DESCRIPTION
1
NDCD
Data Carrier Detect
2
NSIN
Signal In
3
NSOUT
Signal Out
4
NDTR
Data Terminal Ready
5
GND
Signal Ground
6
NDSR
Data Set Ready
7
NRTS
Request To Send
8
NCTS
Clear To Send
9
VCC_COM
VCC_COM
RS422
PIN
SIGNAL
DESCRIPTION
1
422 TXD-
Transmit Data, Negative
2
422 TXD+
Transmit Data, Positive
3
422 RXD+
Receive Data, Positive
4
422 RXD-
Receive Data, Negative
5
GND
Signal Ground
6
NC
No Connection
7
NC
No Connection
8
NC
No Connection
9
NC
No Connection
RS485
PIN
SIGNAL
DESCRIPTION
1
TXD-
Transmit Data, Negative
2
NC
No Connection
3
TXD+
Transmit Data, Positive
4
NC
No Connection
5
GND
Signal Ground
6
NC
No Connection
7
NC
No Connection
8
NC
No Connection
9
NC
No Connection
5 5
9 9
17
Rear I/O Panel
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