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<h4 id="rzaluscs">SCS</h4>
<p>The SNA character string (SCS) has a relatively simple structure, consisting
of a 1-byte hexadecimal control code followed by the data to be printed. Multiple
control codes can be inserted into SCS by printing applications in order to
achieve certain types of output. The SNA character string is sent to the printer
in physical blocks of 256 bytes.</p>
<p>The following are a few examples of SCS control codes:</p>
<a name="wq25"></a>
<table id="wq25" width="100%" summary="" border="0" frame="void" rules="none">
<thead valign="bottom">
<tr>
<th id="wq26" width="33%" align="left">Hex</th>
<th id="wq27" width="33%" align="left">Description</th>
<th id="wq28" width="33%" align="left">Code</th>
</tr>
</thead>
<tbody valign="top">
<tr>
<td headers="wq26">03</td>
<td headers="wq27">ASCII transparent data</td>
<td headers="wq28">(TRNA)</td>
</tr>
<tr>
<td headers="wq26">05</td>
<td headers="wq27">Horizontal tab</td>
<td headers="wq28">(HT)</td>
</tr>
<tr>
<td headers="wq26">0B</td>
<td headers="wq27">Vertical tab</td>
<td headers="wq28">(VT)</td>
</tr>
<tr>
<td headers="wq26">0C</td>
<td headers="wq27">Forms feed</td>
<td headers="wq28">(FF)</td>
</tr>
<tr>
<td headers="wq26">0D</td>
<td headers="wq27">Carriage return</td>
<td headers="wq28">(CR)</td>
</tr>
<tr>
<td headers="wq26">1A</td>
<td headers="wq27">Unit backspace</td>
<td headers="wq28">(UBS)</td>
</tr>
<tr>
<td headers="wq26">15</td>
<td headers="wq27">New line</td>
<td headers="wq28">(NL)</td>
</tr>
<tr>
<td headers="wq26">16</td>
<td headers="wq27">Backspace</td>
<td headers="wq28">(BS)</td>
</tr>
<tr>
<td headers="wq26">35</td>
<td headers="wq27">Transparent</td>
<td headers="wq28">(TRN)</td>
</tr>
<tr>
<td headers="wq26">2843</td>
<td headers="wq27">Set attribute</td>
<td headers="wq28">(SA)</td>
</tr>
<tr>
<td headers="wq26">2BC1</td>
<td headers="wq27">Set horizontal format</td>
<td headers="wq28">(SHF)</td>
</tr>
<tr>
<td headers="wq26">2BC2</td>
<td headers="wq27">Set vertical format</td>
<td headers="wq28">(SVF)</td>
</tr>
<tr>
<td headers="wq26">2BC6</td>
<td headers="wq27">Set line density</td>
<td headers="wq28">(SLD)</td>
</tr>
<tr>
<td headers="wq26">2BD2</td>
<td headers="wq27">Set presentation page size</td>
<td headers="wq28">(SPPS)</td>
</tr>
<tr>
<td headers="wq26">2BD4</td>
<td headers="wq27">Begin underscore</td>
<td headers="wq28">(BUS)</td>
</tr>
<tr>
<td headers="wq26">2BFE</td>
<td headers="wq27">Load alternate character</td>
<td headers="wq28">(LAC)</td>
</tr>
</tbody>
</table>
<p><span class="bold">How print attributes are accomplished by SCS</span></p>
<p>The following examples show how common print functions can be accomplished
by printing applications using SCS.</p>
<dl>
<dt class="bold">Line spacing</dt>
<dd>The equivalent number of NL (new line) control codes is inserted.
</dd>
<dt class="bold">Underlining</dt>
<dd>The underlined text is first inserted into SCS, followed by the appropriate
number of BS (backspace) control codes, and then the same number of underscores.
</dd>
<dt class="bold">Overstriking</dt>
<dd>This is similar to underlining, except that the overstrike characters
are used instead of the underscore.
</dd>
<dt class="bold">Emphasis</dt>
<dd>The text to be emphasized is put into SCS, followed by the necessary
number of BS (backspace) control codes and then the emphasized text is repeated.
This sequence could be repeated several times.
</dd>
<dt class="bold">Page eject</dt>
<dd>The FF (forms feed) control code is inserted.
</dd>
<dt class="bold">Font changes</dt>
<dd>Font changes are supported by printers such as the 5219 that support
final-form text (FFT).
</dd>
</dl>
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