Help!: Schneider EM6436 Energy meter and Raspberry Pi3

[Sai Shibu]

Hello all, 

Im trying to connect Schneider's EM6436 energy meter and RPi3 with RS485. I could establish the connection successfully. The holding registers address are from 403901 onwards, when i try to use the class "client.read_holding_registers(403901,1,unit=1)".

I get an error saying the limit for registers are between 0 & 65535. should i use a different class?

[Timothy Arnold]

Firstly I'm not a modbus expert...!

Looks like you have an additional number in your request - it should be 43901 rather than 403901. Note that the actual register you may want is 3901, as the leading 4 is the holding register table so should get added as part of the request (sorry for the wrong terminology)

Hope that helps

Thanks

Tim

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[Sai Shibu]

Thanks for the reply!

Please check the attached datasheet of the meter. The address starts from 3001. but the modbus tester software that came with the meter starts the address from 403001. if I give just 3001, i get a response from the meter saying 131,1,IllegalAddress. 

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[Timothy Arnold]

Looks like it's an input rather than holding so try client.read_input_register ?

[Sai Shibu]

tried.. it says illegal function

[Sai Shibu]

It is working now. Only thing we have to do is call the complete block using read_holding_register, The address mentioned in the data sheet is the end address. we have to pull the data from the start address and mention the number of registers based on the blocks. 

[Nithin S]

hi sai shibu,

                     I am working with the same meter EM6436, could you help me in reading the data in rs485.