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© Sealevel Systems, Inc.
SeaI/OUSBSERIAL | SL9177 04/2022
Connector Pin Assignments (RJ45)
–
RS-232
The SeaI/O 641U and 681U utilize the RS-232 connector pin out. Integrated status LEDs on each RJ45 serial port
display transmit and receive data activity.
Name
Pin #
Mode
NC
No Connect
1
RTS
Request To Send
2
Output
TX
Transmit Data
3
Output
GND
Ground
4
PWR
Power Output
5
RX
Receive Data
6
Input
CTS
Clear To Send
7
Input
NC
No Connect
8
DCD, DSR, and RI are inputs that are not brought out on the RJ45 connector. DSR and DCD are biased
active, and RI is biased inactive.
