External trigger to Prop 2

[wentingj]

Hi Gang:

I am working on interfacing a Prop 2 and a uMP3 to a time clock system. The time clock has a rj45 connector that provides a relay signal to a bell ringer. I am assuming that the trigger voltage is a 12V DC signal, but until I get my hands on it I will not know for sure. The time clock sets a schedule for bells throughout the day, and I want to have custom sounds for each 'bell' event. (bells are noisy and unfun)

What do I need to do to monitor the trigger signal from the time clock on the Prop 2?

Thanks

Jim Wenting

[JonnyMac]

Well, that depends on the signal out of the clock.  Once you tell us what that is, specifically, we can give you an answer.  It could be as simple as a current limiting resistor of as involved as an opto-isolator.

Get the specs on what's coming out of that RJ-45 and we'll move forward.