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Programmable I/O Lines
TM8000 3DK Hardware Developer’s Kit
Application Manual
September 2003
© Tait Electronics Ltd
3.2.5
External Alert 1 and 2
Application
These two output signals are used to indicate the reception of a call to an
externally connected device. The alert can be programmed to occur for
specific call types.
The AUX_GPIO4 line of the auxiliary connector can be fitted with a power
MOSFET in order to directly connect signal indicators to the radio
(e.g. flashing light, buzzer, horn relay). With the other GPIO lines, if no
power MOSFET is fitted to the AUX_GPIO4 line, the signal characteristics
specified in
“Description of the Radio Interfaces”
apply.
Two different external alert types (external alert 1 and 2) can be specified,
and either none, external alert 1, external alert 2 or both can be activated.
For more information on external alerts refer to the online help of the
programming software.
Configuration
1.
If you want to connect to an external alert device such as horn or
lights relay, follow the instructions in
2.
Configure AUX_GPIO4 (when connection to an external alert
device) or any other output line and associate it with this action.
Set the active state to be high or low (as required).
3.
On the Alerts form, configure external alert 1 and/or 2 (delay,
duration, mode).
Timing
The timing of the external alert signal activation and deactivation is
determined by the settings in the programming application.
Description
When the radio receives a call (individual call 1 or 2, priority call, group call
or emergency call), which goes unanswered for the specified amount of
time, the radio indicates the incoming call to the external device via the
output line according to the currently programmed settings for the call alert
function.
When the call is answered (i.e. external PTT activated or PTT pressed), the
radio will stop indicating the incoming call to the external device.
Related Actions
None.
