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3-6
Section
Memory Check Function
29
tion area. The second part of the check block (2 bytes) is the check code area
that contains the check code.
Calculation area
(n–2 bytes)
Check code area
(2 bytes)
Address
00
01
First address of the
check block area
When a command is sent to write the check code, the CRC code of the data in
the calculation area is calculated and written in the check code area (last two
bytes). When a command is sent to verify the check code, the CRC code of the
data in the calculation area is calculated and compared with the data in the
check code area. If they match, response code 75 is returned to indicate normal
data transmission; if they do not match, response code 75 is returned to warn
that a data error occurred.
After writing the desired data, execute the MEMORY CALCULATE command
(MK) that calculates the check code and writes it to the check code area. Before
reading the data, execute the MEMORY CHECK command (MC) that calculates
the check code and compares it to the code in the check code area. The memory
check will show if the ID Tag’s internal data was corrupted.
Write stage
Write data
Calculate check code
Comparison stage
Read data
Verify check code
Using the Memory Check
Function
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