5-11
Section
Other Commands
92
5-10-2 NACK: NK
The host sends NACK to the Controller when a response from the Controller is
not normally received by the host. When the Controller receives NACK, it will
return the previous response again. The Controller will try to return it nine times.
A command error will result if the Controller receives this command while the
Controller is not awaiting ACK/NACK command.
Command Frame Structure
STX
Node No.
Command
code
NK
ETX
BCC
1
2
2
1
1
5-11 Other Commands
5-11-1 Undefined Command Response
If the Controller receives an undefined command, the Controller will return a re-
sponse for the undefined command to the host.
Response Frame Structure
STX
Node No.
Command
code
IC
ETX
BCC
1
2
2
1
1
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