124
Secti
on 4
RF Ta
g Servic
e Life Det
e
c
tion
RFID System
User's Manual
Section 4
Functions
MDL Command
The overwrite count control area consists of 3 bytes
from the start address. The decrement value from the
overwrite count is written in this area, and if this value
is 100,000 (0186A0 hex) or higher, an end code 76 will
be given as a warning.
The number of overwrites is controlled using
hexadecimal values, and can be read using the READ
command.
If the control area data is already 100,000, the control
area value will not be refreshed, and only a warning
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)
.
Example Using Overwrite Count Control Command (MDL)
In the following example, the three bytes starting from address 0010 (hex) is the overwrite count control
area.
1. The control area is cleared.
“WTSTH10010000000”
2. The overwrite count of 4 is entered.
“MDSTL1001004”
3. Enter the overwrite count of 5.
“MDSTL1001005”
The total overwrite count becomes 9 times.
4. The accumulated count is 100,000 times.
When “MDSTL1001000” is executed, it will be
“MD7610” (overwrite count exceeded.)
3 bytes
Area start address
Upper digit
Middle digit
Lower digit
0010
0011
0012
00 hex
00 hex
00 hex
0010
0011
0012
00 hex
00 hex
04 hex
0010
0011
0012
00 hex
00 hex
09 hex
0010
0011
0012
86 hex
01 hex
A0 hex
