Zebra A300 Specifications Page 376

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If there is only one printer connected to the Host computer, the Net-
work ID number should be set to all zeros (default).
If there is more than one printer, such as in a broadcast or multi-drop
environment, each printer should be assigned its own unique ID
number. Printers in this environment, with an ID of all zeros, will re-
ceive ALL label formats regardless of the actual printer ID number in
the DST. Z-ID block of the Request Packet.
Error Conditions and System Faults
Restarting a Transmission
If a break in communication occurs, the Host must restart the trans-
mission of the current label format with an Initialization Request
Packet. The Zebra printer will not respond to Request Packets sent out
of sequence. However, the Zebra printer will respond to an Initializa-
tion Request Packet and restart its internal counting with the sequence
number of the Request Packet.
CRC Error Conditions and Responses
A CRC error condition can be detected when the printer receives a
Request Packet or when the Host computer receives a Response
Packet. The following list defines each of these errors and how the
Host computer should respond to them.
1. Error: The CRC calculated by the Zebra printer does
not match the one received as part of the Request
Packet.
Response: The Zebra printer will return a Negative
Acknowledgment Response Packet. The Host
computer should retry the same Transaction with
the same Sequence Number.
2. Error: The CRC calculated by the Host computer does
not match the one received as part of the Response
Packet.
Response: The Host computer should retry the same
Transaction with the same Sequence Number.
APPENDIX G 367
Error Detection Protocol
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