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6.5 M-bus - Connection of gateways
M-bus meters such as energy, gas, heat or water meters can be connected to the system centre via the M-bus
gateway. For this, the M-Bus gateway must be supplied with power via a 24 V DC power supply and connected
to the COM2 interface using the serial cable included in the scope of delivery::
The following M-bus gateways are available:
for max. 20 M-bus meters
for max. 60 M-bus meters
The following transmission rates and lengths are possible with the cable type J-Y(ST)Y 2 x 2 x 0.8 mm:
Transmission rate Number of M-bus meters Length
2400 baud (fixed) <= 10
<= 20
max. 5100 m
max. 3200 m
6.5.1 Status LEDs of the M-bus gateway
Green: supply voltage 11..28 V DC is applied
Red: overcurrent (short circuit on the cable)
Yellow: terminal device transmitting
The 3 terminal pairs M+/M- are used to distinguish between the M-bus cables. However the polarity for
M-bus installations is completely unimportant! A power supply is required for both M-bus gateways. For
detailsaboutthepartnumbers,seechapterZubehör für Systemzentrale.
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