Introduction
There are many instances when it is vitally important that the informa-
tion sent to the Zebra printer is received completely Error-Free.
ZPL II supports an error detection protocol called Zebra Packet
Response Protocol to meet this need.
NOTE: This protocol only works when using serial interface. It
does not function when using parallel interface.
What is a Protocol
A Protocol is a precisely defined set of rules. In the case of data
communications, a Protocol defines how data is transmitted, received
and acknowledged between two devices.
The sole purpose of the Packet Response Protocol is to ensure that the
information sent from a Host computer to the Zebra printer is received
accurately. Remember, the protocol cannot insure the accuracy of the
data that is actually sent from the Host computer. The commands and
data needed to make a label (ZPL II Format) are encapsulated within
the information sent from the Host computer.
How Protocol Works
The basic unit of data transfer in the Packet Response Protocol is
called a “Transaction.” A Transaction is a two-way communication
procedure which consists of information being sent from the Host
computer to the Zebra printer, and the printer sending back a response
to the Host computer. This response is an indication that the Zebra
359
APPENDIX G
Error Detection Protocol
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