Input Functions - Motorola GM300 Series Selling Manual

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8.2.8 Decoder Output Control
The output is asserted by the successful decode of a decoder that has 'Assert Output Control'
enabled.
It is de-asserted by the successful decode of a decoder that has 'De-assert Output Control' enabled.
This option is enabled/disabled per personality. This function can be useful for simple telemetry
applications.
Benefits
Allows remote control of external device.


When used in conjunction with external call switch, gives simple telemetry.


8.3

Input Functions

8.3.1 Channel Steering
Channel steering allows an external device to select a channel, using a parallel interface.
The CPS can configure up to 5 input pins in channel steering mode. On the GM340 there are only 3
pins available and six channels selectable.
The radio software takes the state of these inputs and brings them together to form an N bit value,
where N is the number of pins assigned to channel steering by the CPS and the channel selected is
a result of the binary count obtained from these pins; the least significant bit is assigned to the
lowest pin number that has channel steering assigned to it.
This value is the Channel Steering Index.
If the Channel Steering Index is zero, channel steering has no affect and channels are selected by
normal user inputs.
If the Channel Steering Index is not zero, then the channel is set to the channel that corresponds to
the Channel Steering Index value. If the selected channel index refers to a channel higher than the
number of channels programmed in the radio, the highest available channel is selected.
Any attempts to change channel via user button action are ignored if the Channel Steering Index is
not zero, and the Button Error Alert is sounded instead. This includes the following button actions:
Up/Down.


Memory Channel.


Entering channel numbers via the keypad.


If the Channel Steering Index is reset to zero the radio returns to the last 'user selected' channel.
If the radio goes into any Emergency Mode for which an Emergency Revert Channel is defined, the
Emergency Revert Channel takes precedence over Channel Steering.
8.3.2 Hook
External hook performs the same function as microphone hook. This can be a mechanical hang-up
or electrical switch.
FEATURES AND BENEFITS