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2rlp

Serial Communication

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Hi,

I have 3 different sensors connected on the COM2 (RS 485) of a V280. These sensors are plug in types. They send their data serially via MODBUS. These sensors are of different makes & have different FIXED Baud Rates. I have utilized 2 inputs to identify these sensors on the PLC. I need the PLC to switch automatically to these Baud Rates on Identifying the sensors. I am not able to do this. Is there any way in which this can be implemented?

Thanks

Ron

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Hi Ron,

Are your sensors Master or Slave in Modbus?

If thhey are Masters, you have serious trouble, as you have more tan one Master in the network, which is wrong by default.

If the units are Slaves, I don't see any problem. It's a little more complicated thhan standard polling of few slaves. You just need to perform COM Init with relevant parameters each time before sending the Modbus command.

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