Deep SUNA Manual
For SUNA running firmware version 2.4 or later
4. Terminal Interface of the SUNA
4. Terminal Interface of the SUNA
4.1 Sensor Operating States
At power-up, the SUNA's micro-controller starts the firmware. After initialization, it
retrieves the current settings, and enters its operating mode.
Within each operating mode, the firmware is in one of three states:
standby,
data acquisition,
command interface,
where the transition between the states is controlled by the firmware or driven by user or
controller input.
In standby, the sensor can be at different levels of power consumption. In periodic and
APF mode, the sensor achieves the lowest level between data acquisition events,
whereas in polled mode, the power level is a bit higher.
The user can interrupt the SUNA's regular operation in order to enter the command line.
Data Acquisition to Command Interface
Sending a $ character (possible multiple times) will bring the sensor to the command
line. The command line reports via the SUNA> prompt that it is ready to receive
commands.
Command Interface to Data Acquisition
The command line is terminated via the
exit
or the
reboot
command.
Data Acquisition to Standby
Only polled and APF modes have explicit commands (SLEEP and SLP, respectively) to
send the SUNA to standby mode.
In periodic mode, the sensor alternates between standby and data acquisition.
Standby to Data Acquisition
Any input will cause the SUNA to come out of its standby state. Then, it waits for 15
seconds for the $ input character to enter the command line, before returning to the
standby state. When entering standby, the sensor requires approximately 15 seconds to
completely discharge its internal circuitry. Any attempt to bring the sensor out of its
standby state occurring within this 15 second period can lead to undefined behaviour.
4.2 Command Line Interface
Communication with the SUNA is conducted via RS-232 or USB connection. The sensor
checks for availability of a USB connection, and if present, uses a USB virtual com port
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