Fx3 communication RS485

[zendel23]

Hi,
I have a problem with communication of FX3 (Le3u) with the PT100 extension (pta8d08) via RS485. I use IVRD function.
Can you check my project and give me some advice on what might be wrong?
I connected to the board using a PC and read the first register. 
 

Best Regards 

[GreenMan]

Hi

I think IVRD is for inverter communication. You should try the RS instruction.

[zendel23]

yes, I understand that IVRD is a manual for inverters, but many people and many manuals use it as a reading from devices.They will try with the RS function, but isn't it for RS 232?

[Goghie]

IVRD is used for reading inverters parameters from Mitsubishi VFDs. On other side, Mitsubishi PLC clones, usually do not support FROM and TO, and usually you need to use RD3A command. 

[zendel23]

RD3A instruction supports analog inputs. I found out that it is not a 1:1 copy of Fx3 :(

In the Chinese manual, the IVRD function has a completely different register meaning than in the original manual