How do I set the code on my home security system?

I purchased a home that has a security system installed. It has motion sensors in some rooms, and door sensors on every exterior door. I know it is functional as I see it respond to the various sensors, but do not know the code to arm it. The previous owner's disconnected the service to the company that calls... show more I purchased a home that has a security system installed. It has motion sensors in some rooms, and door sensors on every exterior door. I know it is functional as I see it respond to the various sensors, but do not know the code to arm it. The previous owner's disconnected the service to the company that calls the police and forgot the code. I just want to use it as a passive system that sounds the alarm when breached, but cannot arm it without the code. Any guesses on how i can set it? The manufacturer of the alarm is no longer in business, but is Apollo Security.
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