ibm-information-center/dist/eclipse/plugins/i5OS.ic.rzau6_5.4.0.1/rzau6chars.htm

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<title>Special characters used with line data</title>
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<h3 id="rzau6chars">Special characters used with line data</h3>
<p>There are two types of special characters that can be used with line data;
carriage control characters (CC) and table reference characters (TRC).</p>
<p>Carriage control characters affect the data's line positioning. A carriage
control character can be represented as either American National Standards
Institute (ANSI) or machine code. You cannot use both ANSI and machine codes
within a single data set. ANSI carriage control is a standard representation
that is used with printers from many different manufacturers. See the ANSI
carriage control characters topic for the ANSI codes and their functions.
Machine code control characters were defined by IBM&reg;; they correspond to channel command words
issued by the operating system. See the Machine carriage control characters
topic for the IBM machine code values and functions.</p>
<p>There are differences in the conventions used by the i5/OS&trade; operating system
for ANSI and machine code line spacing. The i5/OS convention for ANSI handles line spacing
and then causes the line to be printed. The i5/OS convention for machine codes causes the
line to be printed and then performs the spacing action.</p>
<p>Table reference characters allow an additional byte at the beginning of
a line. The byte indicates which coded font (specified on the AFPCHARS parameter)
is used to print the line. Up to four coded fonts are specified on the AFPCHARS
parameter. The table reference character contains a value of <span class="hex">X'F0'</span>, <span class="hex">X'F1'</span>, <span class="hex">X'F2'</span>, or <span class="hex">X'F3'</span>. The value corresponds to the relative
position of the required coded font in the list on the AFPCHARS parameter.
If table reference characters are used, every data record must contain a table
reference character. The printer file parameter Table Reference Characters
(TBLREFCHR) specifies whether table reference characters are in the data.</p>
<p>If carriage control and table reference characters are used with the data,
the table reference character follows the carriage control character. Both
special characters precede the data. If carriage control bytes are not used,
the table reference character is the first byte of the data record.</p>
<p>These graphics illustrate the valid forms of line data.</p>
<a name="rzau6simple"></a>
<div class="fignone" id="rzau6simple"><span class="figcap">Figure 4. Simple line data</span>
<div class="mmobj">
<img src="rzau6501.gif" alt="This figure has one box with data in it." /></div></div>
<a name="rzau6withtrc"></a>
<div class="fignone" id="rzau6withtrc"><span class="figcap">Figure 5. Line data with table reference characters</span>
<div class="mmobj">
<img src="rzau6502.gif" alt="This figure has two boxes. The first has a table reference character (TRC) and the second has data in it." /></div></div>
<a name="rzau6withcc"></a>
<div class="fignone" id="rzau6withcc"><span class="figcap">Figure 6. Line data with carriage control characters</span>
<div class="mmobj">
<img src="rzau6503.gif" alt="This figure has two boxes. The first has a carriage control character (CC) and the second has data in it." /></div></div>
<a name="rzau6withboth"></a>
<div class="fignone" id="rzau6withboth"><span class="figcap">Figure 7. Line data with carriage control characters and table reference characters</span>
<div class="mmobj">
<img src="rzau6504.gif" alt="This figure has three boxes. The first has a carriage control character (CC), the second has a table reference character (TRC), and the third has data in it." /></div></div>
<p><span class="bold">Related reference</span></p>
<p><a href="rzau6ansi.htm#rzau6ansi">ANSI carriage control characters</a></p>
<p><a href="rzau6machine.htm#rzau6machine">Machine code carriage control characters</a></p>
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