Adcon A720 Guia do Utilizador descarregar pdf (Página 101)

CHAPTER 3

Operations at the Application Level

101

For more details, refer to the user manual for the A733 device.

Frame Parsing Example

To better understand how the retrieved frames must be processed,

this section provides an example of such processing. Let’s suppose

that we used the GETBLOCK command and retrieved a block of

frames of type 37. After parsing the block, we separate it into

individual frames as described in “GETBLOCK” on page 71.

Because all the frames are treated identically, we will show you

how to interpret only one of them from the block. The frame looks

something like this:

02066411312A1F25FF7B7F0000000000000000590016AC6B

0000000000A6D5E81C40000000000206

Separating the date/time, frame type and size, and the data

segment, we get this:

020664: Date (2/6/00)

11312A: Time (17:49:42)

1F: Size (31 bytes)

25: Frame type (37)

FF7B7F0000000000000000590016AC6B0000000000A6D5E8

1C4000000000: Data

Using the description of frame 37, we can parse the data segment.

To show this more easily, we will rewrite the frame with spaces

inserted between different elements:

FF 7B 7F 0000 0000 0000 0000 59 001 6AC 6B0 000

000 000 A6D 5E8 1C4 000 000 000

Now we can easily map the elements onto the frame 37 structure:

FF: RF in

7B: RF out

7F: Digibyte

0000: PulseCounter0

0000: PulseCounter1

0000: PulseCounter2

0000: PulseCounter3

59: BatteryLevel

001: Analog1

6AC: Analog2

6B0: Analog3

000: Analog4

000: Analog5

000: Analog6

A6D: Analog7

5E8: Analog8

1C4: Analog9

000: Analog10

000: Analog11

000: Analog12

1 2 ... 96 97 98 99 100 101 102 103 104 105 106 ... 145 146

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