Omron V680-CA5D01-V2 - Page 128

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RFID System
User’s Manual
SECTION 5
V680 Commands
SECTION 5
Communications
 DATA CHECK (MD C/K)
The DATA CHECK command is used to write or verify the CRC code in the specified check block. The
CRC code is generated using the following polynomial X
16
+ X
12
+ X
5
+ 1.
 1:1 Protocol
Note: When using the multi-access trigger communications designation (MT), the ID controller returns
an end code of 03 after communicating with all Tags.
Refer to Tag Memory Error Correction for details on memory checks.
p. 94
Communications
designation
Specifies the method of communications with the Tag.
Refer to Communications Designation Function for details on the communications designation.
p. 103
Process designation Specifies the check process.
“C”: Check code verification
“K”: Check code calculation
Antenna designation Specifies the Antenna with which to communicate.
“1”: Antenna 1
“2”: Antenna 2
UID A unique identifier used to identify Tags.
Added only for the selective communications designation (SL).
Check block start address Specifies the start address of the check block in 4-digit hexadecimal.
Setting range: 0000
H to FFFDH
No. of check block bytes Specifies the number of bytes in the check block in 2-digit hexadecimal.
Setting range: 00
H, 03H to FFH (Specify 00H for 256 bytes.)
Specify the number of bytes in the check code calculation area plus two for the number of check
block bytes.
Refer to Tag Memory Error Correction for details.
p. 94
End code Indicates the execution result for the command.
00: Normal end, Data normal (only when verification is performed)
76: Data error warning (only when verification is performed)
Refer to List of End Codes for information on other end codes.
p. 171
UID A unique identifier used to identify Tags.
Added only for multi-access communications designations (MT/MR).
Process
design-
ation
Check block
start address
No. of check
block bytes
Terminator
Command
code
Antenna designation
Communi-
cations
designation
××
MD
××
C/K 1/2
××
211 4
2
* CR
2
××
2
××
UID
××
0 or 16
...
Command
Command
code
Terminator
End code
Antenna
desig-
nation
Resend flag
MD
××
22
2
* CR
0×
11
××
UID
××
0 or 16
...
Response