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v10.0.1.x for R2026a
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IO581 Pin Mapping

IO581 Pin Mapping — Reference information about the I/O module connector

4 D-Sub 9 connectors (A-D) Pin Mapping

PinSignal (RS232 Mode)Signal (RS422/RS485 Mode)
1-
2RxRx(+)
3TxTx(+) / Dx(+)
4-
5Ground
6-
7RTSTx(-) / Dx(-)
8CTSRx(-)
9-
[Note]Note

The pinout is identical for all four D-Sub 9 connectors (A-D).

Each connector corresponds to one serial channel; use the RS232 or RS422/RS485 mapping as applicable.