This is example command to turn on the relay 1 with using these libraies above (slave id = 2): ModbusRTUClient. Specifications are subject to alteration without notice. I'd like to do it with these libriaes, but they don't work with esp8266 only with arduino. The COMPACT air handling unit supports these ModBus commands. basic Modbus commands can instruct an RTU to change the value in one of its registers, control or read an I/O port, and command the device to send back one. I'd like to send (MASTER - esp8266 nodemcu, SLAVE - board with relays -> SLAVE_ID = 2) this command: 0x0100 to this 0x0001 accumulator. Hello, I'd like to send modbus command with this library, but I don't know how to do it: GitHub - emelianov/modbus-esp8266: Most complete Modbus library for Arduino.
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