TM8100/TM8200 Service Manual TMAA04-06 Linking and Interface Cable 585
© Tait Electronics Limited November 2007
31.4 Connecting to an External Alert Device
The cable’s external interface connector can be used to connect a TM8260
dual radio system to an external alert device in the vehicle. This enables both
radios to drive the same external alert device.
31.4.1 Installation
The external alert lines used to connect to an external device are open
collector outputs. Connect pin 9 (radio closest to connector) and pin 10
(radio furthest from connector) of the external interface connector to an
input on the interface to the external alert device. Connect the pins together
to drive the same external alert device. Connect the pins separately to drive
separate external alert devices.
Important The high current sink capability of the radio’s auxiliary lines
cannot be accessed with this cable. That means you cannot
connect directly to an external alert device—an interface to
the external alert (such as a controller box) must be used.
Important The internal pullups normally available from the auxiliary
lines are not available via this cable. If the external alert
requires a logic-type signal on the output lines, the lines
must be pulled up to a suitable voltage level by an external
resistor.
31.4.2 Radio Programming
Program both radios as shown in Table 31.6.
Table 31.6 External alert settings in the Programmable I/O form, Digital tab
Pin Mode Direction Label Action Active Debounce
AUX_GPIO6 Conventional Output EXT_ALRT External Alert 1 Low None
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