Hello. I am reading the forum because this trouble never happen before. Plc 1515 2PN device Seneca ZKEYMBus.

The same trouble of thomas_044 the data read are wrong. If i read the device with modbus reader is all ok. 

I will follow the forum to see if amyone have the solved the trouble. 

It is confusing to abbreviate Modbus using the term Mbus or M-Bus because Modbus and M-Bus or MBus are two different protocols.

The M-Bus (Meter Bus) protocol is not the same as the Modbus Protocol.

M-Bus has its own unique 2-wire physical layer where the master modulates voltage to indicate Logic 0 and Logic 1, while the slave(s) modulate current. There are commercial media converter/gateways (PW60) to handle addressing M-Bus with other protocols.

Given the differences in the physical layer between Modbus RTU and M-Bus, it is unlikely that without a converter/gateway, that 
- a Modbus master over RS-232, RS-485 or Ethernet could read M-Bus/Mbus.
- without protocol conversion, the data would make any make sense to a Modbus Master

Additional details can be found in the M-Bus spec here:
https://m-bus.com/assets/downloads/MBDOC48.PDF