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Checking the Data Carrier Life
5-4-2
EEPROM-type Data Carrier
Command Format
M
D
S/L
1
Response Format
M
D
7
Note
56
resistance, and does not indicate that the battery life is over. Accordingly, if a
Data Carrier is purchased and left unused for several months, activate the
battery by performing a read operation for about 10 minutes. (Activating the
battery in this way will run current through it, which will return the internal
resistance to its normal state. This will have almost no effect on the battery
life.)
The MDL and MDS commands can be used to check whether or not the num-
ber of overwriting operations for the EEPROM in an EEPROM-type Data Car-
rier has exceeded the allowable number.
The MDS command subtracts the number of overwriting operations from a
user-specified management area and makes it possible to check whether or
not the number of overwriting operations has exceeded a user-specified num-
ber.
The MDL command adds the number of overwriting operations to a user-
specified management area and makes it possible to check whether or not
the number of overwriting operations has exceeded 100,000. This command
is for EEPROM-type Data Carriers with a specification of 100,000 for the
allowable number of overwriting operations.
Note The MDS command can be used only with version 2.1 or later. Refer to
page 12 for details on the method used to check the version.
X
X
X
X
X
∗
5
CR
End code
75: The number of overwriting operations has not exceeded the allowable number.
76: The number of overwriting operations has exceeded the allowable number.
1. The first address must be @@@0
not specify @@@6
otherwise address error code 7A (hexadecimal) will be returned.
2. The unit number is required for 1-to-n procedure.
∗
X
CR
Specify a hexadecimal value (00
02
,..., FB
) for the number of overwriting
H
H
operations to be added or subtracted.
First address specification
(@@@0
to @@@5
or @@@8
H
H
Read/Write head word (fixed to 1)
Mode specification
S: Subtraction method used. The allowable number of
overwriting operations is specified by the user
(16,700,000 max.) Note that the specification for the
allowable number of overwriting operations for an
EEPROM-type Data Carrier is 300,000 at
temperatures of less than 40°C.
L: Addition method used. When using this command, the
allowable number of overwriting operations is
100,000.
to @@@5
H
to @@@7
or @@@E
H
H
Section 5-4
, 01
,
H
H
to @@@D
)
H
H
or @@@8
to @@@D
H
H
to @@@F
as the first address,
H
H
. Do
H
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