User Manual

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Ethernet Port
The 10/100 Mbps Ethernet port uses the RJ45 connector. The pin
assignment of the port is shown below:
Pin
Signal
1
Tx+
2
Tx-
3
Rx+
4
–
5
–
6
Rx-
7
–
8
–
Serial Port
The serial port uses the DB9 male connector. It can be configured by
software for the RS-232, RS-422, or RS-485 mode. The pin assignment of
the port is shown below:
Pin
RS-232
RS-422
RS-485
1
DCD
TxD-(A)
–
2
RxD
TxD+(A)
–
3
TxD
RxD+(B)
Data+(B)
4
DTR
RxD-(A)
Data-(A)
5
GND
GND
GND
6
DSR
–
–
7
TRS
–
–
8
CTS
–
–
9
–
–
–
CAN Port (UC-3121 Only)
The UC-3121 comes with a CAN port which uses the DB9 male connector
and is compatible with the CAN 2.0A/B standard. The pin assignment of
the port is shown below:
Pin
Signal Name
1
–
2
CAN_L
3
CAN_GND
4
–
5
CAN_SHLD
6
GND
7
CAN_H
8
–
9
CAN_V+