Gigabit Sistems MFPR-3100 Instruction Manual page 46

4-3-2. Pin assignment of the connectors
The pin assignment of the D-SUB 9-pin female connector is shown below:
5
9
D-SUB 9-pin
The A and B is defined as follows:
1
6
Female
B
A
46
Pin number Signal
1
2
3
4
5
6
7
8
9
+
-
GND
TX-A
RX-B
GND
NC
GND
TX-B
RX-A
GND