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8Ch Input/Output Digital Switch TTL LvTTL CMOS RS485 IO Control Module Modbus Rtu Board for PLC Relay, (with Terminal) - Walmart.com
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Is a special protocol converter required to connect Modbus RTU serial interface devices to an Ethernet network? Is the serial device server sufficient?
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Taidacent MODBUS RTU Switch Data Acquisition RS485 Communication Module 8/12/14/32 Way Optocoupler Isolated Input IO Output Module (14 Way Outputs): Amazon.com: Industrial & Scientific
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Serial Port Switch | Serial Controller | Switch Controller | Modbus Rtu Relay | Rs232 Relay - Relays - Aliexpress
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