ICP DAS USA tDS-718i-D User Manual page 44

Tiny Serial-to-Ethernet Device Server
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RS-422 Wiring:
Connect the RxD1- to the TxD1- pins and connect the RxD1+ to the TxD1+ pins.
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RS-485 Wiring:
While using RS-485 modules (e.g., DS-2215i), you should wire the Data1+ with Data2+ signals, and
wire the Data1- with Data2- signals for self-test.
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