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<sect1 id="sdeclcd-howto">
<title>The SDEC LCD Driver</title>
<para>
The SDEC LCD modules are fitted to the Watchguard Firebox firewall appliances.
Watchguard identifies these units by the X-Core, X-e and X-Peak product lines.
The model number indicates a software license level, and has no bearing on the
hardware configuration.
</para>
<para>
This driver implements the same protocol as the
<link linkend="hd44780-8bit-lcm162">HD44780 with lcm162 connection type</link>.
</para>
<sect2 id="sdeclcd-features">
<title>Features</title>
<para>
The SDEC LCDs are interfaced to the appliance using a parallel port. All lines
are hard-wired by Watchguard.
The LCD displays are 20 characters wide and 2 lines high, and
have 4 buttons: <literal>Up</literal>, <literal>Down</literal>,
<literal>Left</literal>, and <literal>Right</literal>. The SDEC model number is
<literal>LMC-S2D20-01</literal>. There is a back light that can be controlled
by software. Due to its low half-life, the driver tries to keep the light off a
short while after buttons have been pressed.
</para>
<para>
For more detailed information about the SDEC LCD, locate the technical and
programming guide LMC-S2D20-01.pdf. The manufacturer web site is:
<ulink url="http://www.sdec.com.tw">SDEC home page</ulink>
</para>
</sect2>
</sect1>
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