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%% |_| |_| \_____| \__| |____| microLab %%
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%% %%
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%% Bern University of Applied Sciences (BFH) %%
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%% Quellgasse 21 %%
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%% Room HG 4.33 %%
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%% 2501 Biel/Bienne %%
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%% Switzerland %%
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%% http://www.microlab.ch %%
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\chapter{{\sc GECKO4com} IO}
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\label{appen:4com}
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This appendix describes the different IO components and the connection diagrams.
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\section{VGA screen and message windows}
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Figure~\ref{fig:vga screenshot} show the VGA screen produced by the {\sc GECKO4com}. In
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Figure~\ref{fig:vga screenshot} the three different text screens are marked in brown.
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\begin{figure}[h]
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\centering%
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\includegraphics[width=\columnwidth]{figs/vga_screens}
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\caption{The VGA screen as produced by the {\sc GECKO4com}. The different
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message windows are marked in brown.}
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\label{fig:vga screenshot}
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\end{figure}
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\section{Buttons, switch and LEDs}
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Figure~\ref{fig:but sw leds} shows the {\sc GECKO4com}'s part of the {\sc GECKO4main}. The
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different buttons, the switch and the bicolor LEDs are marked.
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\begin{figure}[h]
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\centering%
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\includegraphics[width=\columnwidth]{figs/gecko4com}
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\caption{The buttons, the switch and the LEDs of the {\sc GECKO4com}.}
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\label{fig:but sw leds}
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\end{figure}
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\newpage
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\section{VGA connection and RS232}
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The bottom of Figure~\ref{fig:but sw leds} shows the {\sc GECKO4main}'s dual function connector and
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its pin numbering.
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This connector can be used to connect a VGA-screen and a
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RS232 connector. Table~\ref{tab: conn vga rs232} lists the pin-numbers of this connector, the
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corresponding signal names and their connection on a female VGA connector,
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respectively their connections on a female RS232 connector. All signals not
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listed in Table~\ref{tab: conn vga rs232} should be left unconnected.\\
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\textit{Note: The 3.3V power supply can be used to supply level translators for
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the RS232 communication (for example the MAX232).\note}
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\begin{table}[h]
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\centering%
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\begin{tabular}{|c|l|c|}
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\hline
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\textbf{Dual function pin}&\textbf{Signal name}&\textbf{VGA pin}\\
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\hline
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\hline
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\verb+1+&Ground&\verb+5,10+\\
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\hline
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\verb+3+&Vertical Sync&\verb+14+\\
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\hline
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\verb+4+&Horizontal Sync&\verb+13+\\
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\hline
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\verb+10+&Blue&\verb+3+\\
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\hline
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\verb+12+&Green&\verb+2+\\
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\hline
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\verb+13+&Analog Ground&\verb+6,7,8+\\
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\hline
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\verb+14+&Red&\verb+1+\\
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\hline
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\hline
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\textbf{Dual function pin}&\textbf{Signal name}&\textbf{RS232 pin}\\
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\hline
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\hline
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\verb+2+&\multicolumn{2}{c|}{3.3V power supply}\\
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\hline
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\verb+7+&RS232 RxD&\verb+3+\\
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\hline
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\verb+9+&RS232 TxD&\verb+2+\\
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\hline
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\verb+11+&Ground&\verb+5+\\
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\hline
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\end{tabular}
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\caption{Connection diagram of the dual function connector to a VGA connector
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and a RS232 connector (9-pol. Zero Modem connection)}
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\label{tab: conn vga rs232}
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\end{table}
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