Omron V670 Series, User Manual

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5-6 Communication Command
5-14
5-6-5 Memory Check (MD)
Executes the generating polynomial X
16
+ X
12
+ X
5
+ 1 in an area per check block specified by a user and verifies with a check code
added in the check block.
Example: Example of address: Adding a check code to 4 bytes of data from the address 0010h
(Single trigger)
Sent data: MDSTK 1 0 0 1 0 0 6 * [CR]
Received data: DF 0 0 0 0 * [CR]
* 2 Bytes of data are added to 4 bytes of data. So, the number of specified bytes is 6.
Communication designation Specifies how to communicate with a tag. For details, refer to the communication desig-
nation list.
Process designation Specifies a type of check process.
"K": Check code calculation
"C": Check code verification
Antenna designation Fixed to "1".
First address of check block Specifies the first address of check block in four hexadecimal digits.
Available designation range: 0000h to 007Dh.
Number of bytes of check
block Specifies the number of bytes of check block in two hexadecimal digits.
Available designation range: 03h to 80h.
Status flag Shows the verification result of check code.
"0": The verification result is normal.
"1": The verification result is abnormal.
Correct Usage
Do not write necessary information into the last 2 bytes of an area because 2 bytes are used for a record of check code.
For details, refer to "4-5 Memory Check Function".
<Command>
Command
code
"MD"
Communication
designation
Process
designa-
tion Antenna
designa-
tion The first address of check block The number of
bytes of check
block
<Response>
Command
code
"MD"
Termination
code
"00"
Retrans-
mission
flag
Status
flag