WZU-485E-MOD Subject to change without prior notice 4
8. Modbus description
Unless otherwise indicated, all values are in binary format. 2-byte values (signed), and 4-byte values (unsigned), are used.
Note: The module only transmits absolute values of the meter’s parameters.
Data format of a complete meter readout
Accumulated cold energy (eq. tariff register 1)
format and unit according to header
Meter Error (see table 2)
Units and formats (see table 3)
Accumulated energy (Standard register)
format and unit according to header
format according to header m
3
Monthly value - Energy on set day
format and unit according to header
Monthly value - Volume on set day
format according to header m
3
Pulse input 1 accumulated (not used)
Pulse input 2 accumulated (not used)
Pulse value input 1 (not used)
Pulse value input 2 (not used)
format and unit according to header
format and unit according to header
format and unit according to header
Table1: Available Modbus registers
Data reading
The module only responds to data requests with function code 03 (read holding registers).
Meter values are available at data addresses 1 – 40.
Any data address from the range can be chosen as a starting point.
The module does not check the completeness of the variables it sends.
After receiving a data request, the module reads new data from the meter within 5 seconds.
After a data request with the broadcast address “0“, the module reads new data from the meter, but sends no message.
The module does not return exception responses to invalid data requests.