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Communications Commands and Responses
7) Memory Calculation (MK)
This command uses the generating polynomial, X
designated by a user and to compare the results with the check code attached to the check
block.
Command Frame Structure
STX
Node No. Command
1
2
First page of check
block
No. of pages in check
block
Response Frame Structure
STX Node No.
1
2
Response code
8) ACK (AK)
This command is used during ACK/NACK control to inform the Controller that the host device
normally received a response from the Controller. There is no response if this command is used
in ACK/NACK control, but if the Controller is not waiting to receive ACK/NACK signals, an error
will occur when the command is received. Refer to 5-9 ACK/NACK Control for details.
Command Frame Structure
STX Node No. Command
1
2
9) NACK (NK)
This command is used during ACK/NACK control to inform the Controller that the host device
did not normally receive a response from the Controller. When the Controller receives a NACK
command, the previous response is retried provided that the maximum number of retries (9) has
not been exceeded. If the Controller is not waiting to receive ACK/NACK signals, an error will
occur when the command is received. Refer to 5-9 ACK/NACK Control for details.
Command Frame Structure
STX Node No. Command
1
2
5-28
First page of
check block
code
"MK"
2
2
Specifies the first page of the check block in HEX.
Setting range: 00h to 09h, FFh
(FFh can be specified only when using Philips' block 4 as user memory. For details,
refer to 2-5 Tag Memory Map.)
Specifies the number of pages in the check block in HEX.
Setting range: 02h to 0Ch
Retry
Command
Response
flag
code
code
"MK"
"00"
1
2
2
00: Normal completion
For other response codes, refer to 5-10 Response Code List.
Note Philips' block 4 can be used as user memory with Controller software ver-
sions 1.5 or later. The software version can be read with the Version Com-
mand (VS).
ETX BCC
code
"AK"
2
1
1
ETX BCC
code
"NK"
2
1
1
+ X
16
No. of
ETX BCC
pages in
check block
2
1
1
ETX BCC
1
1
+ X
+ 1 to calculate the check block
12
5
Section 5-3
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