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Arduino library to use arduino as modbus device.
“The library gives the program the possibility to be a master, a slave or both on a TCP network.
The Modbus functions 1, 2, 3, 4, 5, 6 15 and 16 are implemented.”I have used this library successfully with kepserver enterprise and Kepware to communicate with Rockwell Factory talk view SE and panel views.
I have used it with arduino mega and uno using w5100 ethernet shield.
I have not tested it with nano.I suppose it would work with a nano aswell via serial coms.
I have one sonewhere, will find it and test.Update: I can confirm that the Nano v3, and the Uno aswell as the Nano loaded with optiboot can work with Rapid scada via modbus RTU.
I can not remember where I downloaded the modbus slave library.
I suppose any modbus slave library should work.
I will try to locate it in github.
MGSmodbus does not support rtu.I found it. I used this modbus slave labrary here.
It was a bit difficult to set it up first because I was used to mgsmodbus.
Hi everybody!!!
The slave library provided by Pieter works just fine, i am doing some test with an Arduino UNO and communicating with the MODBUS RTU (via serial/COM3) and the board broadcast information to the Rapid Scada Communicator….
The Problem now (not a very big deal) is getting a Device Templete for Arduino…
Do Somebody have one??? it would be very helpfull!!!, even a screenshoot!!
Thanks a lot
Diego
Hi..i dont think you need to use RS485 for this. Just connect a PC straight up to your freshly programmed arduino, and run some sort of MODBUS master or test software, using the register number as listed in the code. Remember, in the SCADA software do not use the whole address number, for instance, to access pin 2, you would be reading a COIL on Slave 1 at address 2, not address 10002. Some SCADA packages use ZERO offsets, so subtract 1, so the address for pin 2 would be 1.
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