17
V 1.0
Working with the G-ST 2000+
Assigning contacts
Digital inputs
The G-ST has 8 control inputs, each with an internal pull-
up resistor of 1 kΩ after +5
V.
The control inputs are distributed onto a 25-pin Sub-D socket (input 1-8).
This is located on the back of the device.
Figure: 25-pin Sub-D sockets
Contacts for the processing of events can be connected to the control inputs of the
Sub-D sockets.
The event contacts can start or stop recording, for example, when a contact is
opened or closed, or in case of sabotage. The events are created and set up accord-
ingly in the
G-Set
configuration software.
To set up the tamper monitoring of contacts, follow these steps
.
1.
Define the foreseen contact as normally open
.
2.
Select the monitoring resistance so that the sum of monitoring resistance and
line resistance is 510 Ω +/
- 10%
.
For tamper monitoring using quiescent current circuits, three different levels can be
distinguished at the switch inputs
:
Level
0:
0 to approx. 0.66 V
Level
1:
approx. 0.7 V to approx.1.5 V
Level
2:
approx.1.6 V to 3.3 V
The loop current monitoring is performed with a 470 Ω resistor at the
end of the line
.
Warning!
Please do not apply a voltage above 3.3 V. This can damage the device.
Tamper
monitoring
G-ST 2000+
