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Hardware Setup
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RS-232/422/485 Serial Port
The serial port is a 16550A high speed communications port that sends/receives
16 bytes FIFOs. With Auto-Flow Control and RI Function Support, it supports bar-
code scanners, barcode printers, bill printers, credit card machine, etc.
2-10
1
6
9
RS-232
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
5V or 12V selected by jumper
RS-422
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
RS-485
PIN
SIGNAL
DESCRIPTION
1
485 TXD-
Transmit Data, Negative
2
485 TXD+
Transmit Data, Positive
3
NC
No Connection
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
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