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M-Bus Master MultiPort 250D
3.2 Power supply
The power supply of M-Bus Master MultiPort 250D is the switch mode type which requires voltage between 100 V and
240 V. The frequency can be 50 Hz or 60 Hz.
The mains cable is connected to the master through the associated gland. The diameter must be between 4 and 8 mm.
The master is supplied without mains cable and we recommend a fixed installation, i.e. without using a mains plug as
this would reduce reliability of operation.
3.3 USB
M-Bus Master MultiPort 250D's USB connection can be used for M-Bus communication on an equal basis with the other
serial connections.
The following communication speeds can be used for M-Bus communication:
• 300 baud 8E1
• 2400 baud 8E1
• 9600 baud 8E1
USB version 2.0, which allows up to 5 m cable length, is used. In connection with other USB versions than 2.0, the
maximum cable length recommended is 3 m.
The master's integrated port controller makes sure that communication is only possible on one serial port at a time.
The master is available with a factory-mounted 145 cm cable fitted with a USB connector type A.
1 2 3 4
USB connector type A
To be able to communicate with M-Bus Master MultiPort 250D via USB, the corresponding USB driver must be installed
on the computer used for reading.
The program is available on Kamstrup's home page.
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Kamstrup A/S • 5512853_C1_GB_01.2017
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