ICP DAS USA tDS-722 User Manual page 27

Tiny Serial-to-Ethernet Device Server
6. Perform a Self-test wiring check as follows:

RS-232 Wiring:
Connect the
RxD to the TxD pins

RS-422 Wiring:
Connect the RxD1- to the TxD1- pins and connect the RxD1+ to the TxD1+
pins
While using RS-485 modules (e.g., tDS-715), you should wire the Data1+ with Data2+
signals, and wire the Data1- with Data2- signals for self-test.
Note
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