Zebra A300 Specifications download pdf (Page 375)

Rules for Transactions

1. Every Transaction is independent of every other Transaction

and can only be initiated by the Host computer.

2. A valid Response Packet must be received by the Host computer

to complete a Transaction before the next Request Packet is sent.

3. If an error is encountered during a Transaction, the entire

Transaction (i.e. Request Packet and Response Packet) must

be repeated.

4. The Zebra printer does not provide for system time-outs and

has no responsibility for insuring that its Response Packets are

received by the Host computer.

5. The Host computer must provide time-outs for all of the

Transactions and insure that communication continues.

6. If any part of a Transaction is lost or received incorrectly, it is

the responsibility of the Host computer to retry the whole

Transaction.

Error Detection Protocol Application

The following are the three basic requirements for setting up the

Zebra printer to use the Error Detection Protocol.

Activating the Protocol

Protocol is a front panel selection.

Setting Up Communications

Insure that the Host computer and the Zebra printer are characterized

with the same communication parameters, i.e. Parity, Baud Rate, etc.

(the communications must be set up for 8 data bits).

Setting the Printer ID Number

The Protocol uses the printer’s Network ID number to insure commu-

nication with the proper unit. The Network ID is programmed into

the printer by sending the printer a ^NI (Network ID Number) in-

struction.

366 APPENDIX G

Error Detection Protocol

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Zebra A300 Specifications Page 375