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SECTION 5
RF Tag Memory E
rror Correction
RFID System
User's Manual
SECTION 5
ID Sensor Unit Functions
RF Tag Memory Error Correction
The Write with Error Correction command can be used to write an RF Tag memory check code and error
correction code to the five bytes of memory after the write data. The Read with Error Correction command
performs a RF Tag memory check and makes 1-bit memory error corrections.
When a 1-bit memory error is corrected, the
Error Correction Flag (CIO n+8, bit 03) in the
Results Information will turn ON to warn that a
1-bit memory error occurred, and the normal
data with the error corrected will be returned.
When a 2-bit or larger memory error is detected,
the Status Flag (CIO n+8, bit 04) in the Results
Information turn ON to warn that a fatal error
occurred, and the read data will not be returned.
Example of RF Tag Memory Error Correction
In the following example, the data in addresses 0010 to 0015 (hex) is checked.
1. Send the Write with Error Correction Command.
• First word allocated to Special I/O Unit in CIO Area: CIO 20000 + 10 x 0 = CIO 20000
Address (hex)
0000
Memory check
code calculation
area
Memory check code (upper digits)
Memory check code (lower digits)
Error correction code (upper digits)
Error correction code (middle digits)
Error correction code (lower digits)
0001
Area start
address
Error correction code
calculation area
Area end
address
Word
address
Contents
15 14 13
Command code
Bank designation*
(always 0)
Data storage location
(upper 2 digits)
Data storage
area
First address to process
Number of bytes to process
Data storage location (lower 4 digits)
---
Communications
specification
Data order
12 11 10
9
8
7
6
5
4
3
2
1
0
0B
0
0
0 0
1 0
0 0
0 6
1 1
0 0
0
0
0 0
0 0
0 0
Meaning
CIO 2001
CIO 2002
CIO 2003
CIO 2004
CIO 2005
CIO 2006
*: Always 0 when DM Area is specified, --- : Ignored.
Summary of Contents for CJ1W-V680C11
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