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Appendix A. Pin Assignments
UPort DB9 Pin Assignments
The UPort 1110 and UPort 1130 use male DB9 connectors. Pin assignments are shown in the
following diagram:
UPort 1110 UPort 1130
DB9 (male) Pin RS-232
RS-422
4-wire RS-485
2-wire RS-485
1 DCD (in) TxD-(A) -
2 RxD (in) TxD+(B) -
3 TxD (out) RxD+(B) Data+(B)
4 DTR (out) RxD-(A) Data-(A)
5 GND GND GND
6 DSR (in) - -
7 RTS (out) - -
15
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8 CTS (in) - -
Terminal Block Pin Assignments
The UPort 1130 comes with a DB9 to terminal block converter, with pin assignments as shown
below:
Terminal Block Pin
RS-422
4-wire RS-485
2-wire RS-485
1 TxD+(B) -
2 TxD-(A) -
3 RxD+(B) Data+(B)
4 RxD-(A) Data-(A)
5 GND GND
Note that the converter maps pin 1 on the DB9 connector to pin 2 on the terminal block, and pin 2
on the DB9 connector to pin 1 on the terminal block.