Zebra A300 Specifications download pdf (Page 369)

printer has either accepted or rejected the information sent from the

Host computer.

Information is sent in the form of “Packets.” Packets sent from the

Host computer are called Request Packets.

When a Request Packet is received, the Zebra printer analyzes the

information in the Packet. If the Request Packet is accepted, the Zebra

printer will send a positive response back to the Host computer. The

Host computer can then send the next Request Packet. If the informa-

tion is rejected, the Zebra printer will send a negative response back to

the Host computer. The Host computer then sends the same Request

Packet again.

The Zebra Packet Response Protocol can be used in both sin-

gle-printer applications, where there is only one Zebra printer con-

nected to the Host computer, and multi-drop systems in which several

Zebra printers are connected to the same Host computer.

Request Packet Formats

(from the Host computer)

The first part of each data transfer Transaction is the sending of a

Request Packet by the Host computer. The Request Packet contains a

fixed length ‘Header’ block and a variable length “Data” block. Each

Packet sent from the Host computer to the Zebra printer must always

use the following format.

The Request Packet Header Block is comprised of five fixed-length

fields which are defined as follows:

SOH - (Start of Header Character) The Zebra printer interprets this

character as the beginning of a new Request Packet. The ASCII Con-

trol Code character SOH (01H) is used as the Start of Header Charac-

ter.

360 APPENDIX G

Error Detection Protocol

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Zebra A300 Specifications Page 369