Vega Absolute M-BUS-1 User Manual page 10

While security input connected the device monitors its closure/unlocking. Should the
security input triggering, the device is activated and sends an alarm message to the network.
For connect an external metering instrument contacts M-BUS+ и M-BUS- are used.
The outputs OUT_1 and OUT_2 operate on the principle of open-drain and can be used
to control external devices, such as electric cranes, lighting, sirens and so on. The load capacity
of each output is no more than 200 mA.
In order to increase the battery life, the physical level of the M-BUS interface is switch on
(supply voltage is applied to the outputs MBAS +, MBAS-) just before meter polling with a
programmable delay (the delay value is depending on the type of connected meter). The delay
is introduced for initializing own meter interface and its preparing for receiving data from the
converter. When the polling is complete, the physical M-BUS level is turned off.
When the converter is in class C, the physical level of the M-BUS interface is constantly
on and does not turn off after completing a poll.
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M-BUS-1 / User Manual
Revision 10 - 27 May 2019