Denso BHT-200QW Spezifikationen Seite 311

  • Herunterladen
  • Zu meinen Handbüchern hinzufügen
  • Drucken
  • Seite
    / 587
  • Inhaltsverzeichnis
  • LESEZEICHEN
  • Bewertet. / 5. Basierend auf Kundenbewertungen
Seitenansicht 310
Chapter 15. Function Reference
303
____________________________________________________________________
Block Check Character String function
BCC$
Returns a block check character (BCC) of a data block.
____________________________________________________________________
Syntax:
Syntax:Syntax:
Syntax:
BCC$(datablock,checktype)
Parameter:
Parameter:Parameter:
Parameter:
datablock
A string expression.
checktype
A numeric expression which returns a value from 0 to 2.
Description:
Description:Description:
Description:
BCC$ calculates a block check character (BCC) of datablock according to the block
checking method specified by checktype, and returns the BCC.
checktype is 0, 1, or 2 which specifies SUM, XOR, or CRC-16, respectively, as
described below.
checktype
Block checking
method
No. of
charas for
BCC
BCC
Generative
polynomial
0
SUM 1 Lowest one byte of the
sum of all character
codes contained in a
datablock.
1
XOR 1 One byte gained by
XORing all character
codes contained in a
datablock.
2
CRC-16 2 * Two bytes gained from
the cyclic redundancy
check operation
applied to bit series of
all
characters in
datablock with the bit
order in each byte
inverted.
X
16
+X
15
+X
2
+1
* The upper byte and the lower byte of the operation result will be set to the 1st and 2nd
characters, respectively.
A common use for BCC$ is to perform block checking or to generate a BCC for a data
block.
Seitenansicht 310
1 2 ... 306 307 308 309 310 311 312 313 314 315 316 ... 586 587

Kommentare zu diesen Handbüchern

Keine Kommentare