Zebra A300 Specifications download pdf (Page 378)

How the Zebra Printer

Processes a Request Packet

The following describes the steps taken at the Zebra printer to process

a Request Packet.

1. The Zebra printer looks for a SOH (Start of Header) character.

As soon as it finds one, it places the SOH and all the data after it

into its Receive Data Buffer. This process continues until the

printer receives an EOT (End of Transmission) character.

NOTE: If a second SOH is received before an EOT is detected, the

contents of the Receive Buffer will be discarded. All of the data after

the second SOH will be placed in the Receive Data Buffer.

2. After detecting the EOT, the printer checks for the following:

* The DST. Z-ID matches the printer’s Network I.D.

NOTE:If the Network ID at the printer is all zeros, the printer

will accept all Request Packets regardless of the DST. Z-ID

received. If a Request Packet is received with the DST. Z-ID all

zeros, it is accepted by all printers regardless of their Network

ID setting.

* The Data Format begins with STX and ends with ETX.

* The Sequence Number has not been used before.

If the check is satisfactory.....

Proceed to Step 3.

If any part of the check is unsatisfactory.....

The printer discards the data in its Receive Data Buffer

and waits for another SOH.

No response is sent to the computer.

Exceptions.....

It is possible that the printer will send a response to the

host that the host does not receive. Therefore, the host will

send the same request packet to the printer again. If this

happens, the printer will not use the data since it already

APPENDIX G 369

Error Detection Protocol

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Zebra A300 Specifications Page 378