5-4
Section
Checking the Data Carrier Life
55
Command Format
Read/Write head word
(fixed to 1)
First address specification
(
0
H
to
5
H
or
8
H
to
D
H
)
Specify a hexadecimal value (00
H
, 01
H
,
02
H
,..., FB
H
) for the number of overwriting
operations to be added.
M
D
L
1
X
X
X
X
X
X
CR
∗
Response format
M
D
7
5
CR
∗
End code
75: The number of overwriting operations has not exceeded 100,000.
76: The number of overwriting operations has exceeded 100,000.
Note:
The unit number is required for 1-to-n procedure.
The management area consists of three bytes beginning with the first address of
the area. It is necessary for the user to specify an appropriate number of writing
operations as a dummy value when executing the MDL command. When the
MDL command is executed with the appropriate number of writing operations,
the number will be written to this area and if the total number (i.e., the total of the
number specified by the user plus the number already accumulated in the man-
agement area) is 100,000 or over (i.e., if the value is 0186A0H or over), end code
76 as a warning will be returned. The number of overwriting operations up to the
present time is accumulated as hexadecimal data in the management area.
Therefore it is not possible to read the data using the read command.
If the number of overwriting operations that has been accumulated in the man-
agement area has already exceeded 100,000, the hexadecimal data value will
not be renewed. In this case, only the warning will be returned when the MDL
command is executed. If the MDL command is executed with 00
H
, nothing will be
written to the hexadecimal data but the number of overwriting operations up to
the present time can be checked.
Leftmost digit
Middle digit
Rightmost digit
Three bytes
First address of the area
Note The first address must be
0
H
to
5
H
or
8
H
to
D
H
. Do not
specify
6
H
to
7
H
or
E
H
to
F
H
as the first address, other-
wise address error code 7A (hexadecimal) will be returned.
