Hi,

I'm trying to get data from device via modbus, using MB_Client

When I'm using MB_Mode =  0 -> I can establish connection (busy -> done -> busy -> etc.) but I don't get real data just all '1' in DB 

When I'm using MB_Mode = 103 (recommended by supplier of device) - I don't receive any data, just get error code 8188.

Any idea's?

BR

Hi!

Have you tried with an error logic? Modbus blocks internally use TCOn instructions to establish the connection and TSEND/TRCV for sending/receiving. You can find more information about their states in the manual.

Also, yo can find 8188 in MB_Client status. I suggest you check this.