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1.5 DL/T645-2007 communication
1.5.1 Overview of DL/T645-2007
Only 2007 version of DL/T645 is supported. Other version is not supported.
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DL/T645-2007 transmission settings are as below.
Transmission format
8bit
Parity
Even (fixed)
Stop bit
1bit (fixed)
Response time
50ms (fixed)
Stop time between byte
500ms or more
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Frame format
Frame start number
68H
Address field
A0
A1
A2
A3
A4
A5
Frame start symbol
68H
Control code
C
Data field length
L
Data field
DATA
Check code
CS
End symbol
16H
Address field (A0 to A5)
Address (device number) is consisted of 6-byte (12-digit), but the range is 0 to 9999.
(When the number of digit is not filled, it fills it up with ‘0’.)
Transmission address ‘999999999999H’ is not supported.
Address field supports wild card. It fills it up with AA from the lower to upper without any value.
When it transmits address field, it transmits from lower to upper. (A0 A1 A2 A3 A4 A5)
Ex.) In case of that the address is 55H.
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Correct address field
Transmission format
Without wild card
55 00 00 00 00 00
With wild card
55 00 AA AA AA AA
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Case that is NG with wild card
Address field
Reason
55 00 00 AA 00 AA
There is ‘00’ between ‘AA’ and ‘AA’.
55 00 00 A0 AA AA
A3 of address field is not ‘AA’.
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