13
4-1-3 Negative response frame
As for a response frame changing its length depending on the command sort, it is made basic to respond with
the frame length specified by the command if the command sort character is normally recognized.
No.
Frame/command sort
Cause of the error
Negative response frame
Error code
（
（（
（
M26
）
））
）
1 Standard frame
Option frame
Could not detect ENQ at the
specified position.
Standard frame
(16 bytes length)
Format error
[74]
2 Other than specified
commands
Detected other than specified
commands (R
，
W
，
A
，
E
，
a – k
，
m).
Standard frame
(16 bytes length)
Command error
[75]
3 Selecting command
(a – f
，
m)
Could not detect ETX at the
specified position.
Option frame
(8 bytes length)
Format error
[74]
4 Polling command
（
g – k
）
Could not detect ETX at the
specified position.
Option frame
(12 bytes length)
Format error
[74]
Note:
When returning the negative response of format error or command error in the standard frame as in No. 1
and 2, the contents of the command sort, function sort and function number field become indefinite.
To Next Page
Loading...
