Zebra A300 Specifications Page 17

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Control Instructions
Control instructions are usually preceded by a tilde (~) character. In
most cases, they cause the printer to take a specific action immedi-
ately, such as clearing the memory or feeding a blank label. Control
instructions may interrupt and preempt any format instructions wait-
ing in the printer’s received data buffer.
Prefix Rules and Syntax for
Control and Format Instructions
Format instructions use the caret (^) prefix.
An “RS” (HEX 1E) can be substituted for the (^).
Control instructions use the tilde (~) prefix.
A “DLE” (HEX 10) can be substituted for the (~).
NOTE: Both Format and Control prefix characters can be changed
via ZPL II.
In ZPL II instructions, the caret (^) is treated as an ordinary ASCII
character like any other character you would type in from the
keyboard.
HHIMPORTANTHH
In this manual, when you see the caret (^) character, it indicates
that you are to type the caret (^) character. The caret (^) charac-
ter is not to be confused with pressing the Control (Ctrl) key on
the keyboard.
The caret (^) is a single printable ASCII character having the code 5E
HEX or 94 decimal. Similarly, the tilde (~) is a single printable ASCII
character having the code 7E HEX or 126 decimal.
A few ZPL II instructions can be sent to the printer as either a Format
Instruction or a Control Instruction. The action performed by the
printer will be the same in either case. These instructions must be pre-
ceded by the appropriate prefix (i.e. a ^ or a ~) for the context in
which they are used.
Many ZPL II instructions have parameter strings associated with
them. Changing the value of one or more of these parameters affects
the outcome of the printed label.
8 CHAPTER 2
ZPL II Basics
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