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™)
DESCRIPTION The Pong frame is an answer to the Ping frame. In addition to inform a caller that a
remote is active, it carries some useful information about the device’s status:
• RF_levelIn is the left zero (it is a placeholder and will be filled by the first de-
vice receiving the frame);
• RF_levelOut is the RF level measured by the device when receiving the Ping
frame;
• RTC is the actual value of the remote’s Real Time Clock;
• version is the software/hardware version of the device;
• clkfail and stackfail are meaningless for an A720 – they are kept due to his-
torical reasons;
• WDT is a counter incremented each time the device was reset due to a Watchdog
timeout;
• batt is the battery voltage (this value will be also found in the Data frame);
• internalTemp is the temperature in the A720 housing; the precision of the
sensing element is very low (±4C°), but it is sufficient for battery power man-
agement (charge/discharge). To compute the actual value (in C°), the follow-
ing equation must be used:
• uptime is the time elapsed since the last reset (including a Watchdog reset);
• reserved – these bytes are reserved for future use.
Note: Some of the values send in the Pong frame are specific to the A720 only.
4.5.5.8. Memory Dump Request
ID 20
FORMAT struct {
unsigned int startAddress;
unsigned char length;
} memoryDump_request;
DESCRIPTION
This frame requests a remote to return a number of length bytes, starting from its in-
ternal address startAddress. In general, the useful addresses are located at address
0xB600. An A720 will not issue such frames, but answers to them using the Memory
dump answer frame. The length parameter is limited to the amount of memory
available, therefore if more bytes are requested than a device can cope with, the max-
imum possible will be sent (depending on the memory availability). However, an
A720 will send always a fixed amount of bytes, that is 32.
Temp internalTemp
1087
255
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