DRAGON™ D151
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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
describes NACK types supported by the
reader.
Reader-Supported NACK Types Table
NACK Type
Meaning
Receiver Action
NACK_RESEND
Checksum incorrect.
Ensure checksum is correct.
Limit number of resends.
Send packet again with
resend bit set.
NACK_DENIED
Host is unable to comply
with the requested
message (e.g., beep code
is out of range).
NACK_BAD_CONTEXT
Host does not recognize
the command.
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.
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).
Содержание Dragon D151
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