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Thread: What is MODBUS protocol?
May 29th, 2005, 04:14 AM #1Omer Guest
MODBUS® Protocol is a messaging structure developed by Modicon in 1979, used to establish master-slave/client-server communication between intelligent devices. It is a de facto standard, truly open and the most widely used network protocol in the industrial manufacturing environment.....
It is literally implemented by hundreds of vendors on thousands of different devices in order to transfer discrete/analog I/O and register data between control devices. It's really a lingua franca or common denominator between different manufacturers. One report called it the "de facto standard in multi-vendor integration".
For more information please check [url]www.modbus.org[/url]
November 30th, 2006, 12:58 AM #2Andrew Guest
What is MODBUS protocol?
I new in controls and want know what is MODBUS protocol?
January 22nd, 2009, 06:06 PM #3pchipkin Guest
There are lots of Free Modbus test tools, articles and converters at
Information includes cabling, specs
Conversion to Bacnet, Lonworks, Metasys N2, Rockwell, GE, Omron ...
July 17th, 2009, 03:14 PM #4Kam_ew33 Guest
Modbus has more pains then Ethernet.
October 13th, 2009, 05:40 PM #5apedybal73 Guest
What is MODBUS protocol
I have created a serial device with protocol Modbus RTU Slave. I also created some channels and asigned the respective modbus addresses. I can monitor the activity in the port but there is no response from DAQfactory, I see only RXs. I am not sure how to configure the channel table see attached. Where do I specify the modbus address i.e 40001 in Ch# or Mod Slave#? What effect does the I/O Type parameter has? I can not change it.
By joe in forum CommunicationsReplies: 5Last Post: April 15th, 2011, 09:59 AM
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