59
Checking Function of the Data Carrier’s Memory
Section 5-5
4.
The following indicates that the number of overwriting operations is
100,000. MD76 will be returned to indicate that an excessive number of
overwriting operations will result if MDL1001000 is executed.
5-5
Checking Function of the Data Carrier’s Memory
A Data Carrier memory check is possible by executing the data check com-
mand MD. CRC (Cyclic Redundancy Check) code calculation, data writing,
and data collation are possible in a check block specified by the user. A CRC
code is calculated with the generating function X
16
+ X
12
+ X
5
+1.
Command Format
Response Format
In each check block consisting of the first address and the number of bytes
specified by the user, the area excluding the last two bytes is the calculation
area and the last two-byte area is the check code area of the check block.
If check code write processing is specified with processing code K, the CRC
of the data in the calculation area is calculated and the result is written to the
check code area. If data collation is specified with processing code C, the
CRC of the data in the calculation area is calculated and the result is com-
pared with the data in the check code area. If the result coincides with the
data in the check code area, end code 75 will be returned. If they do not coin-
cide with each other, end code 76 will be returned as a warning.
00
H
00
H
09
H
0010
H
0011
H
0012
H
01
H
86
H
A0
H
0010
H
0011
H
0012
H
Processing specification
(C: Collation; K: Calculation)
Read/Write head word (fixed to 1)
Check block first address (0000
H
to FFFD
H
)
Specify a hexadecimal value (03
H
, 04
H
,..., FE
H
, FF
H
, 00
H
)
for the number of overwriting operations to be added.
00
H
means 256 bytes.
M D C/K 1 X X X X X X CR
∗
M D 0 0 CR
∗
End code
00: Normal completion (at the time of calculation processing only)
75: Normal data (at the time of collation processing only)
76: Data abnormal warning (at the time of collation processing only)
Note: The unit number is required for 1-to-n procedure(s).
Summary of Contents for V600 RFID System
Page 1: ...OPERATION MANUAL Cat No Z193 E1 01 Board Type ID Controller V600 RFID System V600 CM1D...
Page 2: ...V600 RFID System V600 CM1D Board Type ID Controller Operation Manual Produced December 2003...
Page 3: ...iv...
Page 7: ...viii...
Page 10: ...xii...
Page 16: ...6 User I O Section 1 4...
Page 24: ...14 Outline Size Section 2 5...
Page 60: ...50 Communication Time Section 4 6...
Page 82: ...72 Index...
Page 84: ...74 Revision History...
Page 87: ...V6001 RFID System V600 CM1D Board Type ID Controller Cat No Z193 E1 01 OPERATION MANUAL...