Acnodes FPC 8121 User Manual page 23

The RS-422/485 pin assignments for COM2 are listed
below.
Pin #
1
2
3
4
5
6
7
8
9
10
FPC 8121 User's Manual
Signal Name
R2-422 RS-485
TX- DATA-
No connector No connector
TX+ DATA+
No connector No connector
RX+ No connector
No connector No connector
RX- No connector
No connector No connector
GND
No connector No connector
GND
21