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Vega NB-11 / User Manual
10
Revision 06 of 12 January 2022
CONTACTS
When connecting a radio modem to external devices, consider the internal circuitry of
its pulse inputs shown below.
De-bouncing logics with 5 msec time constant is integrated in the pulse counter. The
pulse counting is carried out for frequencies up to 200 Hz.
The pulse counter allows to connect circuits with the following types of NO contacts:
reed switch;
mechanical pushbutton;
open-collector output.
Equipment with NAMUR pulse output is not supported
Polarity effects only "open collector" circuits.
There are two security inputs on the board. The device monitors status changes on the
security inputs and when the security input triggers, the device is activated and sends an alarm
message to the network.
Circuit design of the pulse inputs