Luka0204

Serial/Modbus communication

3 posts in this topic

Greetings,

I have L02CPU and LJ71C24 (for serial comm) and they act as a master. For slave I have some energy analyzer device. Device has a Half-duplex RS-485 serial interface (Modbus RTU protocol). Master only needs to read some data from slave. My question is: What protocol should I use for mentioned communication (MC, Predefined, Nonprocedural, Bidirectional)? I saw that if I use Predefined protocol I can select in Predefined Protocol Library, under the Manufacturer, Schneider Electric - MODBUS - 03: RD holding Registers. Is this OK for my type of communication?

I will try to do some testing between LJ71C24 and QJ71MB91 (who will act as a slave), this or next week, but it would be helpful if someone can tell me correct protocol for my type of communication?

P.s. I am using GX Works 2.

Best regards,

Luka

Edited by Luka0204

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Yes, You should use the pre-defined protocol and set-up the pre-defined protocol support function with a modbus request.

 

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I used Modbus from Schneider for predefined protocol and it worked. Gambit, thanks for the help.

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