Motorola Commercial Series Selling Manual page 36

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8.2.5 Per Channel Output
The output is asserted when the radio is on a channel that has 'Per Channel Output' enabled,
otherwise the output is de-asserted.
This is used to drive any device which is channel usage specific.
8.2.6 Car Radio Mute
This option is used to mute the audio on a car's hi-fi system when the two way radio is in use.
The output is asserted if the radio's loudspeaker is open or the radio is transmitting.
The output is de-asserted if the radio's loudspeaker has been closed and the radio has not
transmitted during the preceding 5 seconds.
8.2.7 PTT Sense
PTT sense is an output line that follows the internal PTT input line. It is used to give full control of the
transmit function to an external device, eg a computer sending data, so that it can control a user's
attempts to transmit voice messages.
If PTT sense is programmed, when the internal PTT is pressed, the PTT sense line is asserted.
Note that pressing the mic PTT does not make the radio go into transmit. If the external device is not
transmitting, it asserts the Voice PTT line. It is this that causes the radio to transmit and the audio to
be transmitted.
If the external device is already transmitting, it does not assert the Voice PTT line and the voice will
not be transmitted. When the external device finishes transmitting, it accepts the next internal mic
PTT.
In this application, the audio source must be set to the front microphone, with external voice PTT.
The data source is input on the flat Tx audio line (pin 5), with external data PTT.
If Voice and Data PTT is used (instead of separate Voice PTT and Data PTT), the external device
will not transmit it's data whilst the audio is transmitting. However, if data is being transmitted, and
the internal PTT is pressed, voice and data will be transmitted simultaneously. This set up will
reduce but not eliminate the possibility of voice and data being transmitted simultaneously, and
hence the data being corrupted.
Benefits
Allows an external device to take control of the transmit function of the radio.
Allows data and audio to be sent from the same radio without clashing.
FEATURES AND BENEFITS