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DRAGON™ D151
This message is sent when the received packet fails the checksum verification or
some error occurred while handling the message.
Note: ACK/NACK Handshaking can be disabled, but this is not recommended.
It is not necessary to respond to a valid ACK or NACK message.
The
Reader-Supported NACK Types Table
reader.
Reader-Supported NACK Types Table
NACK Type
NACK_RESEND
NACK_DENIED
NACK_BAD_CONTEXT
The reader only resends a message twice. If the message is not sent successfully
either time, the reader declares a transmit error and issues transmit error beeps
(LO-LO-LO- LO).
64
describes NACK types supported by the
Meaning
Checksum incorrect.
Host is unable to comply
with the requested
message (e.g., beep code
is out of range).
Host does not recognize
the command.
Receiver Action
Ensure checksum is correct.
Limit number of resends.
Send packet again with
resend bit set.
Do not send data with this
message again. Developer
should check values with
specified values. Developer
should ensure the proper
character is sent, if using
wake-up character.
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