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11
2.2 Pin Assignment
This chapter provides the pin assignments for SUNIX M.2 PCI Express
RS-422/485 Multi-Port Communication Board, as well as the pin assignments
for the optional accessories.
RS-422
or
4-Wire RS-485
PIN
DB9M
DB25M
Pin Header
Tx+
2
3
3
Tx-
1
8
1
Rx+
3
2
5
Rx-
4
20
7
GND
5
7
9
2-Wire RS-485
PIN
DB9M
DB25M
Pin Header
Data+
2
3
3
Data-
1
8
1
GND
5
7
9
