TM8000 3DK Hardware Developer’s Kit
Application Manual
Connecting an External Alert Device
135
September 2003
© Tait Electronics Ltd
9.2
Radio Programming
Programmable I/O
Form
In the Digital tab of the Programmable I/O form, select the AUX_GPIO4
pin and set Direction to Output, Action to External Alert 1 or 2, Active to
Low and Signal State to Momentary.
For further information on the External Alert action refer to
Networks / Alerts
Form
In the General and External Alerts tab of the Networks / Alerts form,
configure the settings of the external alerts.
For further information on how to configure the Alerts form refer to the
online help of the programming software.
9.3
Connecting the External Alert Device
Important
While MOSFET Q707 is rated at 12 A (with heat sink), the
maximum allowable current of the connector and radio’s
earthing system is 2 A. Therefore, a horn must not be con-
nected directly to the radio. A horn relay must be used.
Connect the external alert device to pin 10 (AUX_GPIO4) and pin 8
(13V8_SW) of the auxiliary connector (or a different positive battery
connection).