Adcon A720 Betriebsanweisung PDF herunterladen (Seite 99)

CHAPTER 3

Operations at the Application Level

space available and in order to minimize the radio traffic, the

frames are slightly compressed, in that twelve 12-bit values are

packed in nine 16-bit words.

Type 3 7

SIZE 31 (including the type byte).

ORMAT struct tlg_type37 {

BYTE RF_LevelIn;

BYTE RF_LevelOut;

BYTE DigiByte;

WORD PulseCounter0;

WORD PulseCounter1;

WORD PulseCounter2;

WORD PulseCounter3;

BYTE BatteryLevel;

BYTE Analog[18];

};

DESCRIPTION The analog values are 12 bits and must be converted accordingly,

depending on the sensor connected, while the pulse counters are

16-bit values. Only the RF and battery levels are 8-bit values.

Analog[18] is an array of 18 unsigned bytes that is the result of

packing the twelve 12-bit values. These are the values returned by

the internal A/D converter from the respective I/O connectors.

Note: The integers (16-bit values) are sent using the big endian

convention, that is, first the most significant byte and then

the least significant byte.

The packing mechanism is shown in Figure 27.

Twelve 16-bit values

8-bit packed values

Analog1 Analog2

Analog3

Analog4

12 bits 12 bits 12 bits 12 bits

Byte 0 Byte 1 Byte 2 Byte 3 Byte 6Byte 5Byte 4 Byte 16 Byte 17

etc....

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 145 146

Keine Kommentare

Adcon A720 Betriebsanweisung Seite 99