Phatslam notes This is a crude edit of Smarmengol's excellent library that will compile for the ESP8266. I have renamed this version to "espModbusRtu.h", modify your code accordingly. I only removed ...
1. Send Modbus-RTU command to the device through RS-485 via the assigned "RS485_Serial." 2. Get responses from the device through RS-485. 3. Send the device responses to the human-machine interface ...
Abstract: This paper explains how to set up the communication between PLC and Arduino based on Modbus Protocol. PLC is a master and Arduino is a slave. A Fx2N-48MR, a Fx2N-485BD, an Arduino main board ...
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