No audio output.
Intercom audio is monitored.
All radio audio and override signals are
No outgoing intercom audio is placed
on field phone line terminals. Ring tone
is still received from incoming
Two-way intercom audio is placed on
Radio and intercom audio at same dB
Radio audio de-emphasized by 20 dB
and vehicle alarm signal by 6 dB, with
respect to intercom audio when an
override signal is present.
Depressing the CHANGE switch, with
respect to the settings of the SYSTEM
and PROGRAM switches, allows
changing display brightness levels,
clearing of error messages (fault still
exists until corrected) and programming