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Additional Decode Functions
13.3
Stun / Unstun
Stun/Unstun can only be activated by the system manager or administrator.
A 5 tone sequence is sent to a radio which, on decode, causes it to stop working: the buttons do not
function and it will not transmit or receive audio.
This feature can be used to stop a radio working in case:
The radio is stolen;
Hire radios are not returned or payments not made;
A user abuses communication protocols.
The radio can only be unstunned, i.e. returned to operational use, by an unstun signal sent from the
system administrator or returning the radio for reprogramming.
Benefits
Over-the-Air Stun prevents fraudulent or illegal use of the radio.
Render stolen radios unusable.
Disable unreturned hire radios.
Disable lease radios if monthly payment not received.
Over-the-Air reset of stunned radios eliminates need to bring radio to base.
13.4
Auto-Acknowledge Features
When the GM300 Series radio decodes one of its 5 tone sequences, it can be programmed to
automatically send back a 5 tone telegram. This provides an (audible) 5 tone response to the calling
radio, so that they know that their call has been received.
The radio can decode the auto-acknowledge sequence. Most 5 tone systems use this to automate
calls from the central dispatcher. If the dispatcher console does not receive the expected
acknowledge, the call is resent to the mobile – Telegram Repeat.
It is possible to incorporate "Status" within the auto-acknowledge telegram. It is therefore possible
for the central dispatcher to "interrogate" the mobile radio to find out the current status of the mobile
vehicle operator. This of course assumes that the operator remembers to update the Status number
as appropriate.
The auto-acknowledge feature is highly flexible, to enable the radio to work in a wide variety of 5
tone systems. Up to 16 different acknowledge replies can be set up, each with different encode
telegrams and other features such as making the radio wait until the channel is free before sending
back the auto-acknowledge telegram, sending the telegram on a pre-defined channel, and turning
off the usual side tones and LEDs associated with Auto-Ack operation.
An auto-acknowledge telegram may be sent prior to the radio invoking a call forward telegram.
Benefits
Auto-Acknowledge can be used to automate calls from the dispatcher.
Auto-Acknowledge with status allows dispatch to integrate the radio.
High degree of system flexibility is possible.
"Silent Interrogate" or "Radio Check" is possible (turn off side tones/LEDs).
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