C
In a Fire and Gas System we are utilizing AI board but that will act as DI for the signals coming from Manual Call Points. In the circuit we are including 2 resistors, one in series with the contact (R1) and the other in parallel with the contact (R2).
<b>What is the main purpose of these two resistors and why not using a normal DI board to monitor the signals?</b>
<b>What is the main purpose of these two resistors and why not using a normal DI board to monitor the signals?</b>