Tait TM8100 Installation Manual page 26

The radio allows for connection of an emergency switch to any input line
Emergency Switch
to enter the emergency mode. If connected to the AUX GPI2 input line,
the radio can also use 'emergency power sense' to power up the radio to
enter the emergency mode.
The selected input line must be programmed to 'Enter Emergency Mode'
and active to 'Low'. To use 'emergency power sense', hardware link LK3
must be fitted (factory default), and AUX GPI2 must be used. For more
information, refer to
page
application.
■
The radio allows for output to external alert devices using the digital GPIO
External Alert
Device
lines of the auxiliary connector and the internal options connector.
AUX GPIO4 can be fitted with a power MOSFET (Q707) to directly
connect external alert devices (e.g. flashing light, buzzer, horn relay) to the
radio. Also, resistor R768 must be removed.
The selected output line must be programmed to 'External Alert 1 or 2',
active to 'Low', and signal state to 'Momentary'.
■
This means that the negative side of the alert device must be connected to
AUX GPIO4 and the positive side to pin 8 (+13V8 SW). The external alert
device must be capable of accepting a voltage of between 10V and 18V.
26 Installing the Radio
"Hardware Links and Power-Sense Options" on
24, the service manual and the online help of the programming
Connect a normally open switch between the pin of the input line (pin 5
for AUX GPI2) and pin 15 (AGND) of the auxiliary connector.
Notice While the MOSFET is rated at 12 A (with heat sink), the max-
imum allowable current of the connector and radio's earthing system is
2 A. Therefore, a horn must not be connected directly to the radio.
A horn relay must be used.
Connect the external alert device to the pin of the output line (pin 10
for AUX GPIO4) and pin 8 (+13V8 SW) of the auxiliary connector (or
a different positive battery connection).
TM8100/TM8200 Installation Guide
© Tait Limited November 2012