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Tuesday, November 21, 2017
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Standard/ Daniel
New to Modbus. What is the difference from Standard and Daniel both ASCII and RTU.

Hello All,

I'm new at Modbus and trying to find the difference from Standard and Daniel both ASCII and RTU.

So far I get the same data when i switch between these two function. My question will be whats the benefits and are there any major difference?

Thanks

Hi Nano61,

Some Modbus RTU slaves support Enron or Daniels Modbus for some of their registers. This means that instead of normal 16 bit (1 word) registers, they have 32 bit registers. Most Modbus RTU masters are hard coded to only read 16 bit registers, meaning if they get a response with a 32 bit register it will be discarded as a false reply..

//Patrick L

Thanks Patrick,

Makes sense. I was able to locate my 32 bit registers which are on the 5xxx register space.