Simplex Mode - Marmitek PROGUARD 800 User Manual

If you press "9" to answer the call, the control panel simultaneously cancels the siren
when you answer the call.
If using Simplex mode, the call is connected in Listen mode – see 6.5: Simplex Mode.

6.5: Simplex Mode

It is possible that the Two-Way Audio features on your system are programmed to
operate in "Simplex" mode. Simplex mode means that one party may speak while the
other party listens.
If using Simplex mode, the call is connected in Listen mode. In Listen mode, the
microphone on the control panel is turned on so that you can listen in. If you want to
switch to Speak mode, press "1" on your telephone.
In Speak mode, the microphone is turned off and the speaker is turned on so that you
can speak to the person on the other end of the line. If you want to switch back to Listen
mode, press "0" on your telephone.
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