TransAct Ithaca 280, Programmer'S Manual

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Programming Codes iTherm
®
280 Programmer’s Guide
Page 94 Rev K
[ESC] [ S Redefine character set
ASCII [ESC] [ S <L
L
> <L
H
> <B
C
> <T
1L
><T
1H
> <T
2L
><T
2H
> <T
3L
><T
3H
>
…<T
nL
><T
nH
>
Hexadecimal
1BH 5BH 53H …
Decimal
<27> <91> <83> …
IPCL none
Description The [ESC] [ S <L
L
> <L
H
> <B
C
> <T
1L
><T
1H
> <T
2L
><T
2H
> <T
3L
><T
3H
> …
<T
nL
><T
nH
> command allows an application to replace or redefine the
active character set mapping in the printer, where <L
L
> <L
H
> defines the
total length of the following data:
<L
L
> + 256 * <L
H
> = 1 + 2 * the total number of characters to be replaced;
<B
C
> is the first character in the active map to be replaced
<T
1H
> <T
1L
>
6
is the internal address of the replacement character image.
The mapping of a print pattern to each character address is referred to a
code page or character set. At any given time, the printer character set is
comprised of 256 characters. Each character is addressed by an 8-bit
value generally referred to as a character code. For example, if you want
to print an ‗A‘, it would be addressed by sending a <65> decimal to the
printer. Sixty-five predefined code pages or character maps assign
characters to a particular address built into the printer. Occasionally, an
application needs to redefine a character or group of characters in a code
page. The iTherm
®
280 Printer allows the map for any code page to be
redefined or replaced. The define character set command allows any
character or group of characters to be replaced with any other printable
character. Over 500 printable master characters are defined in the
printer. For example, to redefine the character map for the 35th character
and replace it with internal master character 346, the redefine character
set command is used as follows:
[ESC] [ S <3> <0> <35> <90> <1>
^^^^^ ^^ ^^^^^^
| | +- 346
th
Character in the Master Set
| | [(1 * 256) + 90]
| +------- 35
th
Character
+--------------- 3 bytes to follow [(0 * 256) + 3]
The new map remains until the printer is power cycled or the character set is
redefined. The code page and character set commands completely redefine the
table.
6
The internal character map is provided in the Master Character Set Definitions Guide , PN
100-9785.