TM8000 3DK Hardware Developer’s Kit
Application Manual
Connecting an External Alert Device
133
September 2003
© Tait Electronics Ltd
9
Connecting an External Alert Device
The TM8000 radio allows for output to external alert devices using the
digital GPIO lines of the auxiliary connector, the internal options connector
and, with the TM8105, the programming connector.
The AUX_GPIO4 line of the auxiliary connector can be fitted with a power
MOSFET in order to directly connect external alert devices (e.g. flashing
light, buzzer, horn relay) to the radio. With the other GPIO lines and if no
power MOSFET is fitted to the AUX_GPIO4 line, the signal characteristics
specified in
“Description of the Radio Interfaces”
apply.
This chapter describes the connection of an external alert device to the
AUX_GPIO4 line of the auxiliary connector and the programming of the
radio for an external alert signal.
Important
Modifications to radio-frequency transmitting equipment
can void the user's authority to operate the equipment.
By distributing the TM8000 3DK Hardware Developer’s
Kit, Tait Electronics Ltd. does not accept liability for any
non-compliance or infringement of intellectual property
rights resulting from the application or use of this kit or
information. Any person modifying Tait radio-frequency
transmitting equipment is responsible for ensuring that the
modified equipment meets all legal and regulatory require-
ments in the country of use or supply.
To connect an external alert device to the AUX_GPIO4 line of the auxiliary
connector, the following steps must be carried out:
1.
Fit power MOSFET Q707 and remove resistor R768.
2.
Program the radio.
3.
Connect the external alert device.