On read-out all values are transferred in a telegram.

• The following telegrams are supported:
• initialisation: SND_NKE Reply: ACK
• Read out meter: REQ_UD2 Reply: RSP_UD
• Change primary address: SND_UD Reply: ACK
• Reset RS1: SND_UD Reply: ACK
• Slave selection for the secondary address Reply: ACK
• The device does not reply to unknown requests
• The transfer rate is detected automatically
• The device has a voltage monitor. In case of voltage loss,
• all registers are saved in the EEPROM.

Changing the M-bus primary address:

• To change the M-bus primary address, hold down SELECT for 3 s.
• In the menuthat appears, press MODE to increment the address by 10.
• Press SELECT to increment by 1.
• When the required primary address is set, wait until the main menu reappears.

Secondary address: It is possible to communicate with the energy meter according to the

• standard EN13757 with help of the secondary address.
• The use of wildcards is possible.