Hardware Setup
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2-10
RS-232/422/485 Serial Port Connector
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.
▶
PIN
SIGNAL
DESCRIPTION
1
2
3
4
5
6
7
8
9
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
VCC_COM1
Data Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Signal Ground
Data Set Ready
Request To Send
Clear To Send
Voltage select setting by J1
RS-232
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
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
