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Adcon A720 Betriebsanweisung Seite 72

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Seitenansicht 71
CHAPTER 3
Advanced Functions
72
01006F021905640F20361509D7C4F8000056A9830F19005B
02A9830F010060021905640F2F361509C9B2F8000056AA80
0F1A006B02AA8110010075021905641002361509DECAF800
0056AA800F18004F02AA800F010055021905641011361509
D8C1F8000056AA7D0F16004D02AA7E0F0100550219056410
20361509D2BBF8000056A87F0F13004002A8800F01004602
190564102F361509DBB2F8000056A97E0F19005102A97F0F
010059021905641102361509CAB9F8000056A97C0F1E0045
01A97C0F01004E021905641111361509C6B1F8000055A684
0F1A001F01A6840F010020011905641120361509D7C3F800
0055A4870F11001101A4870F01001101190564112F361509
D1C1F8000055A4870F13001601A4870F0000170119056412
02361509DAC3F8000055A5860F12001A01A5860F01001C01
1905641211361509DBC8F8000055A6830F13002C01A6840F
010032011905641220361509D7C5F8000055A5841014001E
01A5840F01002001190564122F361509DBC0F8000055A484
0F14001701A4850F010016011905641302361509DFCFF800
0055A3860F13001501A38610000015010F
OK
To help you understand how the block must be interpreted, the
first two frames and the last frame in the block are displayed below
(notice the extra carriage returns inserted to help you see the
individual frames):
1905640F11361509DFC9F8000057AB7F0F1A006702AB7F0F
01006F02
1905640F20361509D7C4F8000056A9830F19005B02A9830F
01006002
...
1905641302361509DFCFF8000055A3860F13001501A38610
00001501
0F
The last byte on the last line is the checksum of the whole block
(modulo 256). It is the sum of all the bytes, ignoring the overflows.
Note: The dates for years greater than 1999 are returned in a
three-digit format, that is, 100 for 2000, 101 for 2001, and so
on.
The data portion of the frame is frame-type dependent, which in
turn depends on the RTU that generated it (see “Frame Types” on
page 92 for a description of all frame types currently in use).
However, separating individual frames from a GETBLOCK string is
easy if you consider the following:
• Each frame has a header and a data portion.
• Whatever the data portion is, the header has a constant
structure and known length (date/time and number of bytes in
the data segment).
Thus, to identify the beginning of the next frame you need only
parse the date/time and the frame size and then jump to the next
frame based on the size of the data portion (adding the frame size
Seitenansicht 71
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