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3. M-Bus Master
Two versions of the M-Bus Master are available.
One with a display and one without, however, they
function in the same way.
The M-Bus Master is built-up with supply print,
connection print and main print.
Furthermore the bracket has room for an extra
module - see paragraph 7 and 8.
The main print is placed at the top of the case, and
except from transformator, bridge connection and
connection terminals everything is mounted on
this print.
The front plate has four light emitting diodes with
the following indications:
Power:
Indicates that the M-Bus Master is supplied with
power
Overload:
Indicates that too much power is drawn from the
bus. I.e. either a short-circuit or too many M-Bus
Slaves connected to the M-Bus Master.
Request:
Blinks when data are sent from M-Bus Master to
M-Bus Slave.
Data:
Blinks when the M-Bus Master receives data from a
M-Bus Slave.
M-Bus Master without display
Order numbers:
M-Bus Master without display
M-Bus Master with display
M-Bus Master manual
The M-Bus Master is no intelligent unit, but a re-
peater, which converts a RS232 or an optical for-
mat to the M-Bus format.
M-Bus format means:
From M-Bus Master to M-Bus Slave is:
mark » 30 V
space » 18 V
There has to be at least 12 VDC between mark and
space.
From M-Bus Slave to M-Bus Master is:
mark = closed current
space = closed current + approx. 17 mA.
The M-Bus Master can send and receive at 300 or
2400 baud both over the optical connection possi-
bility and over the data output in the bracket which
can be connected direct to RS232 by means of an
adapter cable.
The only difference between the two M-Bus Mas-
ters is that M-Bus Master with a display makes it
possible to read data from all heat meters con-
nected, and a computer for reading of data is not
necessary.
Following heat meter data can be read on the dis-
play:
1. For all heat meters
- Info code
- Energy
- Volumen
- In A
- In B
- Target date
2. For each individual heat meter
- Target energy
- Target volume
- Flow temperature
- Return temperature
- Dt, power and flow
For further information - see the M-Bus Master
manual.
M-Bus Master with display
x = module options (see paragraph 7 and 8)
xxx = Country code - is filled in by Kamstrup A/S
66-98-11x-xxx
66-98-A1x-xxx
5511-185
9
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