Zebra A300 Specifications download pdf (Page 371)

This field can contain from 0 to 1024 characters. If the Format of a

label is longer than 1024 characters, the Data Format fields from con-

secutive packets will be concatenated together in the printer’s Receive

Data Buffer as if they were sent as one long direct transmission.

Special consideration has been given to the possible requirement to

include ASCII Control Characters (values less than 20H) in the Data

Format portion of a Request Packet. Characters such as EOT (04H),

STX (02H), SOH (01H), and ETX (03H), are part of the Error Detec-

tion Protocol and could interrupt normal communication procedures if

received at the wrong time. See DISGUISING CONTROL CODE

CHARACTERS later in this description.

ETX - (End of Text) The Zebra printer interprets this character as

the end of the variable length Data Format portion of the Request

Packet. The ASCII Control Code character ETX (03H) is used as the

End of Text Character.

CRC - (Cyclic Redundancy Check) The CRC is a 2 character field.

A Cyclic Redundancy Check is a type of error checking used to main-

tain the validity and integrity of the information transmitted between

the Host computer and the Zebra printer. This Protocol uses the 16-bit

CCITT method of producing a CRC.

The CRC is a two Byte value derived from the contents of the packet

between, but not including, the SOH character and the CRC code

itself. The Zebra printer will calculate a CRC of the Request Packet

received and compare the value with the CRC Value in this field. The

CRC of the Request Packet must match the CRC calculated by the

Zebra printer in order for the Request Packet to be valid.

EOT - (End of Transmission) The Zebra printer interprets this char-

acter as the end of the Request Packet. The ASCII Control Code char-

acter EOT (04H) is used as the End of Transmission Character.

Response From the Zebra Printer

When the Zebra printer receives the EOT character, it will begin act-

ing on the Request Packet received. The printer will compare certain

characters and numeric values within the received Request Packet and

send a response back to the Host computer.

362 APPENDIX G

Error Detection Protocol

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Zebra A300 Specifications Page 371