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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
6.6 Modem
If a modem should be used for remote maintenance of the system centre and for the automatic transmission of
alarms, this must be connected to the COM1 port.
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
details about the part numbers, see chapter .Accessories for system centre v6.0.
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