Connecting Modbus half duplex (A/B/Gnd) using WIZ750SR-485-EVB
Serial-to-Ethernet & ConfigTool
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Serial-to-Ethernet & ConfigTool
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RE: Connecting Modbus half duplex (A/B/Gnd) using WIZ750SR-485-EVB
by TheoIm WIZnet ·
Hi,
This board supports both RS-422 and RS-485, which is why the terminals are labeled as TX and RX.
However, in RS-485 (Modbus RTU) mode, RXD+ and RXD− function as the A/B differential pair.
For a Modbus RTU daisy-chain connection, simply connect:
RXD+ → A,
RXD− → B,
and GND as the common reference.
The TXD pins are intended for RS-422 (4-wire) operation and are not required for RS-485 2-wire communication.
Thank you