
74 System Feature Overview
November, 2008
2.8.3.1 RDAC Local Settings Rear Accessory Port CPS Programmable
Pins
The CPS offers a few repeater-wide settings as well as the ability to program the input and output
pins on the rear accessory connector to meet the needs of the external equipment. Note that the
repeater now supports up to 16 channels. This has made the signal mode setting in the previous
releases obsolete.
The rear accessory also has some pins that can be programmed to specific input/output functions.
These pins can be programmed to either active high or low. See the table below for descriptions of
these functions available for each GPIO pin.
CPS Programmable Pins Description
Major Alarm (Locked State)
This output pin is used to report a major alarm has happened 3 times, been
reset three times, and the repeater is in now locked state.
Minor Alarm
This output pin is used to report minor alarm(s) is happening on the
repeater.
Repeater Disable
Asserting this input pin triggers the repeater to enter disabled state. In this
state, the repeater can not execute repeat functions.
Releasing this input pin will revert the repeater back to enabled state where
the repeaters can start repeating calls.
Tx Power Level High
Asserting this input pin triggers the repeater to change the TX power level
to be high.
Releasing this input pin will revert the repeater back to TX low level low.
Repeater Knockdown
Asserting this input pin triggers the repeater to temporarily enter Repeat
Path Disable Mode. In this mode, the repeater’s transmitter will only be
enabled by the external PTT and the audio source will be the Tx Audio
Input pin.
Releasing this input pin will revert the repeater back to Normal Mode where
the repeaters transmitter can be activated by a qualified RF signal on the
receive frequency.
*Note that repeater knockdown is not supported in digital mode.
Channel Change
There are up to 4 pins that can be configured and used for channel change.
The repeater can support up to 16 channels.
Asserting this input pin represents 1.
Releasing this input pin represents 0.
0000 represents first channel, 1111 represent the last channel.
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