Structure of the RSP_UD2 telegram
Byte 1 2 3 4 5 6
Name Start Length Length Start C A
Cont. 68 68 8
Byte 7 8 9 10 11 12
Name CI ID1 ID2 ID3 ID4 MAN1
Cont. 72 46
Byte 13 14 15 16 17 18
Name MAN2 GEN MED TC Status SIG1
Cont. 40 8 2 0 0
Byte 19 20 ... ... N-1 N
Name SIG2 DIF Data Data SC Stop
Cont. 0 16
Measurement signal level
The data transfer in the M-Bus network is implemented
through modulation of the supply voltage, whereby the
voltage for a high signal is 36 V and 24 V for a low signal.
The slave device answers the master via the modulation
of its current draw, whereby the high signal is 1.5 mA and
the low signal is 11-20 mA.
Signal Voltage Reply current
High-Signal 36 V 1.5 mA
Low-Signal 24 V 11-20 mA
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