User`s manual

58
Section 3
V680 Commands
RFID System
User's Manual
Section 3
Commands
■ DATA CHECK (MD C/K)
This command writes or compares the CRC code using the specified check block unit. The CRC code
is calculated from the generated polynomial expression X
16
+ X
12
+ X
5
+ 1.
For details on the memory check, refer to Memory Check Function in ID Tag.
p.111
Communications specifi-
cation
Specifies the method for communicating with the ID Tag.
For details on communications specifications, refer to Communications with the ID Tag.
p.47
Process setting Specifies the check process.
K: Check code calculation
C: Check code comparison
Fixed value Always 1.
Check block start
address
Specifies the start address of the check block in 4-digit hexadecimal.
Setting range: 0000 to 1FFD hex
Number of check block
bytes
Specifies the number of bytes in the check block in 2-digit hexadecimal.
Setting range: 00h, 03 to FF hex (00 = 256 bytes)
The number of check block bytes is the check code calculation area + 2 bytes.
For details, refer to Memory Check Function in ID Tag.
p.111
End code Indicates the execution result for the command.
An end code of 00 indicates normal completion.
For details on end codes, refer to End Codes.
p.69
Fixed value Always 1.
Resend flag Always 0.
Command
MD
1
2
2
CR
C/K
××
2
××
2
11
××××
4
Check block
start address
Terminator
Number of check
block bytes
Command
code
Communi-
cations
specification
Fixed
value
Pro-
cessing
specifi-
cation
Response
MD
0
2
2
CR
1
00
2
11
Command
code
Terminator
End code
Fixed
value
Resend
flag