This section provides a list of header block fields.
SOH (start of header character)
The Zebra printer interprets this character as the beginning of a new Request Packet. The ASCII Control Code character SOH (01H) is used as the Start of Header Character.
DST. Z-ID (destination Zebra-ID)
This is the three-digit ASCII I.D. number used to identify which Zebra printer is to receive the Request Packet. The Zebra printer compares this number to the Network ID number assigned to it during Printer Configuration. The Zebra printer will act on the Request Packet only if these numbers match.
SRC. Z-ID (source Zebra-ID)
This is a three-digit ASCII number used to identify the Host computer. This number is determined by the user.
TYPE (packet type)
This field is used to define the type of Request Packet being sent by the Host. Only two characters are valid in this field:
‘P’ indicates a Print Request Packet
‘I’ indicates an Initialize Request Packet
Most of the Packets sent by the Host to the Zebra printer will be of the ‘P’ variety, requesting a label to be printed.
The ‘I’ character tells the Zebra printer to initialize the packet sequence numbering. It is required in the first packet of a new printing session, after starting up the Host computer or the Zebra printer.
SEQ. # (the sequence number of the request packet)
This block contains a single digit number used to denote the current Transaction Number. The Host computer must increment this number by “1" for each new Request/Response Transaction pair, i.e. 0, 1, 2,..., 9. The numbers repeat after every 10 Transactions.
