Tait TM8000 Series Applications Manual

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Tait TM8000 Series Applications Manual Manual pdf 56 page image

56 Programmable I/O Lines TM8000 3DK Hardware Developer’s Kit Application ManualSeptember 2003 © Tait Electronics Ltd3.1.13 Preset ChannelApplication This input signal is used to temporarily select a pre-programmed channel.When this input line is deactivated, the radio returns to the channel it wason at the time the input line was activated. This allows temporary channelchange for purposes such as transmitting GPS data on a data channel insteadof the voice channel.Configuration 1. Configure a list of channels.2. Configure an input line and associate it with this action. Set the activestate (high or low) and the debounce time (0 to 100ms).3. On the same form, select the preset channel. Hidden channels are alsoavailable for selection. Scan group IDs are not available.Timing Allow debounce time plus 2ms plus time for channel change (typically10ms) for the preset channel to be selected or to return to the previouschannel. If timing is critical in your application, then this will need to bemeasured with the frequency step you intend to use.Description When the input line is activated, the currently selected channel ID is storedfor future use and the radio changes to the preset channel.When the input line is deactivated, the radio returns to last selected channel.While the input line is activated, the channel selection keys on the controlhead are not functional.If the input line is active while the radio is powered up, it must be re-appliedfor the action to be carried out.If a preset channel is selected and the radio powers down and up again thenthe last selected channel will be selected and not the preset channel.Related Actions The ‘BCD Pin 0 to 4’ input signal is used to change to a specified channelnumber.The ‘Home Channel’ input signal is used to permanently change to aspecified reference channel, which can be used to increment or decrementfrom.