GAI-Tronics CommandPLUS Series Desktop Console Installation and Service Manual - Manual (Page 13)

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Description
General Description
The CommandPLUS Series Desktop Console is a multi-channel console compatible with conventional
radio systems. It uses tone remote control to interact with the base stations, but dc remote control and
E&M control are available as options. The CommandPLUS Series Console allows control of up to 12
individual base stations.
Operating parameters are programmed via the console’s CARD (Configuration Application for Radio
Dispatch) Suite Software Application.
Tone Remote Control
Tone control is a particular scheme of remote radio control. This scheme uses tones of different
frequencies and levels to command the radio to perform various tasks. Control tones are categorized as
high level guard tone, function tone, or low level guard tone. These tones are generated by the console
and routed to the base stations via wire line connections (leased or owned dry lines).
High level guard tone precedes all control tone sequences and notifies the selected base station of a
change in its operating mode. High level guard tone is normally active for 120 ms, but the duration is
programmable from 120 to 4000 ms in 10 ms increments. Refer to Figure 1.
Following the high level guard tone is function tone. Function tone is normally active for 40 ms, but the
duration is programmable between 40 and 4000 ms in 10 ms increments. It forces the radio to perform a
task specified by the tone’s frequency. Low level guard tone follows function tone and remains active as
long as the base station is transmitting. Low level guard tone is present only when the tone control
sequence is a command that causes the radio to transmit.
Figure 1. Tone Remote Control Tones