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Section 5 Communications Commands
RFID System
Operation Manual
Section 5
Communications
MANAGEMENT DATA SUBTRACTION/LIMIT (MDS/MDL)
These command are used to control the number of times that a Data Carrier without a battery can be
overwritten. By updating the management area designated by the user, the user can determine
whether the number of times the EEPROM has been overwritten exceeds the set number.
■ 1:1 Communications
Note: The write life of a Data Carrier without a battery at an ambient temperature of 40C is 300,000
overwrites.
If the start address is set between @@@6H and @@@7H or between @@@EH and @@@FH, an address error (error
code: 7A hexadecimal) will be returned as the end code.
Mode specification Specifies the check processing to perform.
S: Subtraction (The number of overwrites can be set to any value up to 16,700,000 overwrites.)
(See note.)
L: Addition limit (The overwrite limit is always 100,000 overwrites.)
R/W Head No. Specifies the Read/Write Head with which to communicate.
1: Read/Write Head 1
2: Read/Write Head 2
Area start address Specifies the first address of the overwrite control area as a four-digit hexadecimal number.
Specifiable range: @@@0H to @@@5H or @@@8H to @@@DH
Decrement/increment
count
Specifies the number of counts to update the overwrite count as a two-digit hexadecimal number.
Specifiable range: 00H to FFH (The overwrite could will only be checked if 00H is specified.)
Refer to Data Carrier Service Life Detection for details.
p.65
End code Indicates the results of command execution.
75: Normal end
76: Data error warning
Refer to End Codes for more information.
p.135
xx
Command code
MD
xx
S/L 1/2
xx
211 4
Terminator
2
*CR
Area start address
2
Decrement/
increment count
Mode
specifi-
cation
R/W Head No.
Command code
MD
75
22
2
*CR
End code
Terminator
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