Vega Absolute M-BUS-1 User Manual page 13

M-BUS-1 / User Manual
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.
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.
Permissible load for each digital output is 200 mА
To increase the load on the device outputs, it is necessary to use an external relay. The
relay connection scheme is shown below.
Revision 15 – 30 June 2021
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