5511-185 GB-DE
-DK/03.2005/R
ev
. E1
14
Communication
M-Bus Master to M-Bus Slave
Mark voltage
= 30 VDC
Space voltage
= 18 VDC
Quiescent voltage
= 30 VDC
M-Bus Slave to M-Bus Master
Mark current = quiescent c 20 mA
Space current = quiescent current
Quiescent current = sum of Slaves 1.5 mA
Speed 300 or 2400 baud
Set of commands
M-Bus Master
M-Bus Slave to
to M-Bus Slave
M-Bus Master
SND_NKE (adr)
CON_ACK
initialization acknowledgement
REQ_UD2 (adr)
RSP_UD1
request for data reply
with data
Between SND_NKE and REQ_UD2 there
must be a pause of min. 10 seconds
and up to 40 seconds depending on the
integration load on MULTICAL
®
.
Data read by PC via the PcM-Bus program
Customer ID No., TA2, TL2, TA3, TL3, InA,
InB, Prog. No., Config. No., Date, Energy,
Volumen, Hourcounter, t
Forward
, t
Return
,
∆
t,
Power, Flow, Peakpower or peakflow, In-
focode, Target-date*, Energy*, Volumen*.
*) Target date data
Additional data from MULTICAL
®
66-CDE
m
3
x t
Forward
, m
3
x t
Return
, Cooling energy,
Yearly peak effect.
Data read by M-Bus Master with display
and displayed
Info code**, Energy, Volume, InA, InB,
Date*, Energy*, Volume*, t
Forward
, t
Return
,
∆
t,
Power, Flow.
**) Info code will only be displayed if
different from 0.
For futher information regarding the M-Bus
system from Kamstrup, please refer to the
Technical Description 5511-710 GB.
It is not possible
to read the M-Bus
system by means
of a computer and
a M-Bus Master
with display at the
same time.
