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  1. IoTPlay

    Testing 8CH relay modbus using modpoll on Raspberry Pi - cannot get past "Reply time-out!"

    Thank you @mercator , I have tried above, same result: modpoll -m rtu -a 1 -b 9600 -d 8 -1 /dev/ttyUSB0 RESULT: modpoll 3.9 - FieldTalk(tm) Modbus(R) Master Simulator Copyright (c) 2002-2020 proconX Pty Ltd Visit https://www.modbusdriver.com for Modbus libraries and tools. Protocol...
  2. IoTPlay

    Testing 8CH relay modbus using modpoll on Raspberry Pi - cannot get past "Reply time-out!"

    Hi, I am brand new to this forum, rs485, and modbus !!! I am trying to use WaveShare Modbus RTU 8-ch Relay Module connected to WaveShare USB to RS485 on Raspberry Pi, attempting to test over terminal - using ssh, to at least read the registers, using the tool modpoll on modbusdriver.com. I...
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