Acknowledgements
Negative Acknowledgements
An Acknowledgement is used to acknowledge
reception of a packet or as an affirmative
response to FREE BUFFER ENQUIRIES and is
sent by the following sequence:
A Negative Acknowledgement is used as a
negative
response
to
FREE
BUFFER
ENQUIRIES and is sent by the following
sequence:
•
•
An ALERT BURST
An ACK (ACKnowledgement--ASCII code
86H) character
•
•
An ALERT BURST
A NAK (Negative Acknowledgement--ASCII
code 15H) character
ALERT BURST
ACK
ALERT BURST
NAK
13
DISCONTINUED DATASHEET