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Communications Commands and Responses
Section 5-3
5-28
7)
Memory Calculation (MK)
This command uses the generating polynomial, X
16
+ X
12
+ X
5
+ 1 to calculate the check block
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
code
“MK”
First page of
check block
No. of
pages in
check block
ETX BCC
1
2
2
2
2
1
1
First page of check
block
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.)
No. of pages in check
block
Specifies the number of pages in the check block in HEX.
Setting range: 02h to 0Ch
Response Frame Structure
STX
Node No.
Retry
flag
Command
code
“MK”
Response
code
“00”
ETX BCC
1
2
1
2
2
1
1
Response code
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).
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
code
“AK”
ETX BCC
1
2
2
1
1
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
code
“NK”
ETX BCC
1
2
2
1
1
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