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v10.0.1.x for R2026a
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IO503 Pin Mapping

IO503 Pin Mapping — Reference information about the I/O module connector

Front Connector Pin Mapping

PinSignal (RS232 Mode)Signal (RS422/RS485 Mode) PinSignal (RS232 Mode)Signal (RS422/RS485 Mode)
1Ground 26Ground
2Channel 1 TxChannel 1 Tx(-) / Dx(-)27-
3Channel 1 RxChannel 1 Tx(+) / Dx(+)28-
4Channel 1 RTSChannel 1 Rx(-)29-
5Channel 1 CTSChannel 1 Rx(+)30-
6Ground31Ground
7-32Channel 4 TxChannel 4 Tx(-) / Dx(-)
8-33Channel 4 RxChannel 4 Tx(+) / Dx(+)
9-34Channel 4 RTSChannel 4 Rx(-)
10-35Channel 4 CTSChannel 4 Rx(+)
11Ground36Ground
12Channel 2 TxChannel 2 Tx(-) / Dx(-)37-
13Channel 2 RxChannel 2 Tx(+) / Dx(+)38-
14Channel 2 RTSChannel 2 Rx(-)39-
15Channel 2 CTSChannel 2 Rx(+)40-
16Ground41Ground
17-42+5 V Termination supply
18-43-
19-44-
20-45-
21Ground46-
22Channel 3 TxChannel 3 Tx(-) / Dx(-)47-
23Channel 3 RxChannel 3 Tx(+) / Dx(+)48-
24Channel 3 RTSChannel 3 Rx(-)49-
25Channel 3 CTSChannel 3 Rx(+)50-
[Note]Note

There is no fuse at the Termination Supply output. Ensure, therefore, that the current does not exceed 400mA.