Enlighten your Arduino to be a Modbus master
This is an Arduino library for communicating with Modbus slaves over RS232/485 (via RTU protocol).
The following Modbus functions are available:
Discrete Coils/Flags
Registers
Both full-duplex and half-duplex RS232/485 transceivers are supported. Callback functions are provided to toggle Data Enable (DE) and Receiver Enable (/RE) pins.
Install the library into your Arduino IDE using the Library Manager (available from IDE version 1.6.2). Open the IDE and click Sketch > Include Library > Manage Libraries…
Scroll or search for ModbusMaster, then select the version of the library you want to install. Quit/re-launch the IDE to refresh the list; new versions are automatically added to the list, once released on GitHub.
Refer to Arduino Tutorials > Libraries Using the Library Manager.
Refer to Arduino Tutorials > Libraries Importing a .zip Library.
Refer to Arduino Tutorials > Libraries Manual Installation.
This library has been tested with an Arduino Duemilanove, PHOENIX CONTACT nanoLine controller, connected via RS485 using a Maxim MAX488EPA transceiver.
Conforms to Arduino IDE 1.5 Library Specification v2.1 which requires Arduino IDE >= 1.5.
Arduinos prior to the Mega have one serial port which must be connected to USB (FTDI) for uploading sketches and to the RS232/485 device/network for running sketches. You will need to disconnect pin 0 (RX) while uploading sketches. After a successful upload, you can reconnect pin 0.
Please submit an issue for all questions, bug reports, and feature requests. Email requests will be politely redirected to the issue tracker so others may contribute to the discussion and requestors get a more timely response.
The library contains a few sketches that demonstrate use of the ModbusMaster library. You can find these in the examples folder.
…Project inspired by Arduino Modbus Master.
Copyright:: 2009-2016 Doc Walker
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
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