Service Manual Part 5
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The spare external pin in the T2000 power connector (refer to Figure 8.4.1) may be wired
to any of the option connections tabled in Section 5.9, “Options Interface Specifications”.
The most commonly used connections (hush, horn, emergency and auxiliary), are
explained below.
The T2010 and T2015 can be programmed to have channel selection controlled via S15
on the T2000 logic PCB.
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An active +5V signal is supplied to this line each time the PTT is pressed or a valid
transmission is received (i.e. audio is heard), and is commonly used to mute a car radio.
It may be connected directly to some modern stereo systems, otherwise an interface
device will be required. This signal is sometimes referred to as the ‘external mute’.
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This is used in a Selcall system where an external alert has been programmed. An active
+5V signal is supplied to this line when the radio goes into the external alert cycle. This
signal will either be pulsed, steady or ringing, depending on the radio model and pro-
gramming.
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This is used to put the radio into emergency mode for a Selcall system and is activated
when the input is switched to ground.
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An active +5V signal is switched to this line when the front panel
key (T2010, T2015 & T2020 models) or
key (trunked models) is
active. This is programmable with both latching and momentary operation available.
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