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™)
• analog0 to analog2 and analog4 to analog6 are the values returned by the in-
ternal A/D converter from the respective connectors (see the hardware sec-
tion for more details).
• internalTemp is the temperature in the A720 housing (it’s the same value
transmitted with a Pong frame – see “Pong” on page 47 for more details).
4.5.5.11. Set ID
ID 40
FORMAT struct {
unsigned int ID;
} setId;
DESCRIPTION
This frame requests a remote to change its own Id number. The remote will answer
with a General acknowledge frame before changing its Id. An A720 will never issue
this frame type, but it will answer to it.
4.5.5.12. Set Slot Time and Sample Rate
ID 41
FORMAT struct {
unsigned int slot;
unsigned char rate;
} setSlot;
DESCRIPTION
This frame requests a remote to change the size of its slot (default 900 seconds, i.e. 15
minutes) and the sampling rate (default 3).
• slot is the number of seconds a new slot of sampled and averaged data will
be stored in the internal memory FIFO of the device;
• rate is the number of samples per slot taken; these samples will be averaged
before being stored.
The remote will answer with a General acknowledge frame. An A720 will never issue
this frame type, but it will answer to it.
4.5.5.13. Set Frequency
ID 42
FORMAT struct {
unsigned long frequency;
unsigned int step;
} setFreq;
DESCRIPTION
This frame requests a remote to change its frequency. The remote will answer with a
General acknowledge frame before changing its operating frequency. To further se-
cure the transaction, the frequency change will be performed only after the remote
receives the acknowledge frame from its next neighbor (for more details, see also