Zebra A300 Specifications Page 372

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Zebra Packet Response
The Packet Response protocol provides the highest degree of error
checking and is well suited to the Host-Multiple Printer application.
The Response Packet from the Zebra printer will always use the fol-
lowing format.
The Response Packet Header Block is comprised of five fixed-length
fields which are defined as follows:
SOH - (Start of Header Character) The Zebra printer sends this
character as the beginning of a new Response Packet. The ASCII
Control Code character SOH (01H) is used as the Start of Header
Character.
DST. Z-ID (Destination Zebra-ID) This is the same three digit
ASCII number used to identify the Host Computer that was contained
in the SRC. Z-ID field of the Request Packet that initiated this
Response Packet. The Host compares this number to its known value
to insure it is the proper destination.
SRC. Z-ID (Source Zebra-ID) This is the three character ASCII
Network I.D. of the Zebra printer that is sending the Response Packet.
TYPE (Packet Type) This block is used to define the type of
Response Packet being sent to the Host. Only three characters are
valid in this field.
‘A’ This is a Positive Acknowledgment to the Host computer. It
indicates that the Request Packet was received without a CRC
error. The Host computer may send the next Request Packet.
‘N’ This is the Negative Acknowledgment to the Host computer.
It indicates that an error was detected in the packet sent from the
Host computer. The Host computer must retransmit the same
Request Packet again.
APPENDIX G 363
Error Detection Protocol
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