Technical Manual
Table Of Contents
- Wireless Sensor Interface A720 (addIT™)
- 1. About the A720
- 2. Hardware
- 4. Software
- 4.1. AMOS
- 4.2. Mode Check
- 4.3. A/D Task
- 4.4. The Terminal Task
- 4.5. The Radio Interface Task
- 4.5.1. Digital Squelch
- 4.5.2. Modulation Technique Used
- 4.5.3. Generic Format of a Radio Frame
- 4.5.4. Data Frames
- 4.5.5. Frame Types
- 4.5.5.1. Request
- 4.5.5.2. Broadcast Answer
- 4.5.5.3. Set I/O Request
- 4.5.5.4. Read I/O Answer
- 4.5.5.5. Broadcast Request
- 4.5.5.6. Ping
- 4.5.5.7. Pong
- 4.5.5.8. Memory Dump Request
- 4.5.5.9. Memory Dump Answer
- 4.5.5.10. Data
- 4.5.5.11. Set ID
- 4.5.5.12. Set Slot Time and Sample Rate
- 4.5.5.13. Set Frequency
- 4.5.5.14. Set Battery Charge Levels
- 4.5.5.15. Set Pulse Counters Parameters
- 4.5.5.16. General Acknowledge
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Wireless Sensor Interface A720 (addIT™)
More details on the functionality of each mode will be described when dealing with
the individual tasks.
4.3. A/D Task
This task is responsible for the actual sampling of the A/D inputs (where the sensors
are connected). In addition, the task is responsible for the power management of the
system: it checks the battery level and performs the following actions:
• Switches on and off the solar panel (that charges the battery), depending on
the battery state and internal temperature of the device;
• Brings the system in a low consumption mode if the battery is low;
• Switches the system off if the battery is in a misery state, in order to protect it.
Figure 25. Power Management flow chart.
Measure Battery
and Temperature
Temp
> 20°C?
Yes Batt
> 7.0 V?
Switch Off
Yes
No
No
Temp
< -10°C?
No
No
Yes
Yes
Batt
> 7.6 V?
No
Batt
> 7.3 V?
Batt
< 6.5 V?
Yes
Batt
< 5.5 V?
Yes
Exit
No
Switch On
No
Enter
Misery Mode
Batt
< 5.0 V?
No
Yes
Yes
Switch
Device Off
Note: The thresholds shown are
for reference only; actually
they are computed based
on the SET PMP command.