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Kamstrup A/S • 5512853_C1_GB_01.2017
M-Bus Master MultiPort 250D
9 GSM/GPRS
M-Bus Master MultiPort 250D can be extended by a Kamstrup GSM 6H modem, enabling the master to be remotely read
via GSM or GPRS. Reading via GPRS, the maximum M-Bus communication speed is 2400 baud.
GSM 6H is mounted in the upper module area and is connected to the master’s internal power supply as shown in the
picture.
Electrical connection between the GSM 6H module and the M-Bus Master is established by means of a jumper.
The external antenna must be connected as shown below and placed well away from the M-Bus master and the
connected network wires.
Antenna connection Jumper
Connection of supply
SMS command
SIGNAL - for reading the signal strength
Syntax, command
=SIGNAL#
Syntax, return answer
Signal: <signal strength> (0-31)
Example
=SIGNAL#
Return answer, correct Signal: 14 (0-31)
Return answer, error
NO ANSWER
Note:
SMS commands must be sent in either capital or
small letters. Capital and small letters must not be
mixed in the same SMS command.
As remote reading system, we recommend Kamstrup PcBase III and PcNet III.