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SECTION 4
Tag Service Life Check
RFID System
User’s Manual
SECTION 4
Functions
MDL Command
The overwrite count control area consists of 3 bytes from
the specified start address. The increment value from the
overwrite count is written to this area, and if this value is
100,000 (0186A0 hex) or higher, an end code of 76 will be
given as a warning. The number of overwrites is con-
trolled using a hexadecimal value, and can be read using
the READ command.
If the control area data is already 100,000 or higher, the
control area value will not be refreshed, and only a warn-
ing will be returned as a response. When the refresh
count is set as 00 hex, the count will not be updated, and
only an overwrite count check will be performed.
For details on the command format, refer to OVERWRITE COUNT CONTROL (MD S/L).
p. 123
Example Using Overwrite Count Control Command (MDL)
In the following example, the three bytes starting from address 0010H is the overwrite count control
area.
Do not execute the MDS command and MDL command for the same Tag. Doing so will prevent managing the service life.
1)The control area is cleared.
“WTSTH10010000000”
2)The overwrite count of 4 is entered.
“MDSTL1001004”
3)Next, the overwrite count of 5 is entered.
“MDSTL1001005”
The total overwrite count becomes 9 times.
4)The following memory status will exist after the
accumulated count has reached 100,000 times.
If “MDSTS1001000” is executed now, “MD7610”
(overwrite count exceeded) will be returned.
3 bytes
Area start address
Upper digit
Middle digit
Lower digit
0010
0011
0012
00H
00H
00H
0010
0011
0012
00H
04H
00H
0010
0011
0012
00H
09H
00H
0010
0011
0012
A0H
01H
86H
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