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Connector Pin Out and Assignments
DB9M to VSI-Pro Side
1 – N/C
2 – TXD
3 – RXD
4 – DTR Connected to power the Opto232
5 – GND
6 – DSR Connected to power the Opto232
7 – RTS N/C
8 – CTS JP1
ON
= Connected to power of the Opto232
OFF
=
N/C
9 – N/C
DB9F from Cash Register Side
1 – N/C
2 – RXD
3 – TXD
4 – DTR JP1 1-2 ON
= Connected to power the Opto232
1-2 OFF
= Not Connected to power the Opto232
JP2 3-4 ON
= Short DTR (4) to DSR (6)
5 – GND
6 – DSR JP1 3-4 ON
= Connected to power the Opto232
3-4 OFF
= Not Connected to power the Opto232
7 – RTS JP2 1-2 ON
= Short RTS (7) to CTS (8)
8 – CTS JP2 1-2 OFF
= No Short
9 – N/C