Hytera DMR System Planner
27
Voltage Range of GPIO Pin
For mobile radio:
High TTL: 3.6–5V; Low TTL: 0–2.4V
GPIO Pin input: 0–1.2V (low); 2.0–5V (high).
GPIO Pin output: 0–0.8V (low); 2.4–5V (high).
For portable radio:
GPIO Pin input: 0–0.3V (low); 0.7–3.3V (high).
GPIO Pin output: 0–0.22V (low); 0.8–3.3V (high).
There are three ways to activate the Telemetry feature: pressing the programmed
Telemetry key, GPIO status change and receiving the appropriate command from
other radios.
To activate this feature by a programmable key, you need to perform related
operations with the radio and assign it to the programmable key. For example, you
can associate the “Send Pulse Command” with “Telemetry Button”, and assign
“Send Pulse Command” to TK key. Then you can press the TK key to send pulse
command.
When the radio is connected with a telemetry device, any change in device status
would result in GPIO status change. Providing there is any command associated
with GPIO status change, the radio will implement the command when GPIO status
changes. For example, when the GPIO status changes as a result of the change in
the status of connected telemetry equipment, the radio will implement the
predefined command, namely, it will send its GPIO status to the target radio. In this
way, you can know the status of other equipment remotely.
When a radio receives the command from another radio, it will perform an
appropriate operation associated with the command. For example, it receives
“Toggle Voltage Command”, and it will toggle the voltage of specified GPIO Pin as
configured previously.
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