11.8.1 Connecting a panic button or a passive on/off sensor to
the modem’s digital input:
Figure 24
1. Connect the negative side of the voltage source to the Ground pin (GND).
2. Connect the first wire of the panic button, or the passive on/off sensor, to one of the 4
digital inputs.
3. Connect the second wire to the positive of a power source (2VDC - 30VDC).