Commit b361ecc2 authored by Theodor-Adrian Stana's avatar Theodor-Adrian Stana

doc: Finished hardware guide

parent b1c7dc4f
...@@ -9,7 +9,7 @@ ...@@ -9,7 +9,7 @@
\noindent \rule{\textwidth}{.1cm} \noindent \rule{\textwidth}{.1cm}
\hfill January 19, 2015 \hfill January 20, 2015
\vspace*{3cm} \vspace*{3cm}
......
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...@@ -66,7 +66,7 @@ work, see \\ ...@@ -66,7 +66,7 @@ work, see \\
\hline \hline
\multicolumn{1}{c}{\textbf{Date}} & \multicolumn{1}{c}{\textbf{Version}} & \multicolumn{1}{c}{\textbf{Change}} \\ \multicolumn{1}{c}{\textbf{Date}} & \multicolumn{1}{c}{\textbf{Version}} & \multicolumn{1}{c}{\textbf{Change}} \\
\hline \hline
19-01-2015 & 0.1 & First draft \\ 20-01-2015 & 0.1 & First draft \\
\hline \hline
\end{tabular} \end{tabular}
} }
...@@ -150,7 +150,7 @@ control the CONV-TTL-RS485 via the I$^2$C lines on the VME P1 connector to run t ...@@ -150,7 +150,7 @@ control the CONV-TTL-RS485 via the I$^2$C lines on the VME P1 connector to run t
In order to test the RS-485 conversion capabilities of the CONV-TTL-RS485, a CONV-TTL-RTM-RS485 card In order to test the RS-485 conversion capabilities of the CONV-TTL-RS485, a CONV-TTL-RTM-RS485 card
together with a couple of RS485 tester cards are needed. The RS485 tester cards mount on together with a couple of RS485 tester cards are needed. The RS485 tester cards mount on
the CONV-TTL-RTM-RS485 and are controlled by gateware to loop RS-485 output pulses on a channel the CONV-TTL-RTM-RS485 and are controlled by gateware to loop RS-485 output pulses on a channel
back to that channel's input. For more information on how these connections are done, back to that channel's input. For more information on how these connections are made,
see the next section. see the next section.
%====================================================================================== %======================================================================================
...@@ -166,7 +166,7 @@ with gateware on the CONV-TTL-RS485 FPGA, both the CONV-TTL-RS485 front module ( ...@@ -166,7 +166,7 @@ with gateware on the CONV-TTL-RS485 FPGA, both the CONV-TTL-RS485 front module (
CONV-TTL-RTM-RS485 rear transition module (RTM) cards can be tested. CONV-TTL-RTM-RS485 rear transition module (RTM) cards can be tested.
The RS485 tester uses MAX14778 differential multiplexers~\cite{max14778} to make the loopback connections The RS485 tester uses MAX14778 differential multiplexers~\cite{max14778} to make the loopback connections
under gateware control. This control is exerted by means of four Lemo 00 cables, which under gateware control. Control is exerted by means of four Lemo 00 cables, which
should be connected from the FM's INV-TTL outputs to the dedicated Lemo 00 connectors on the should be connected from the FM's INV-TTL outputs to the dedicated Lemo 00 connectors on the
RS485 tester. For proper connection of each cable between FM and RTM, the cables should be labeled RS485 tester. For proper connection of each cable between FM and RTM, the cables should be labeled
with colored labels as shown in Table~\ref{tbl:control-sigs}. The gateware will drive the with colored labels as shown in Table~\ref{tbl:control-sigs}. The gateware will drive the
...@@ -189,9 +189,6 @@ INV-TTL outputs as shown in Table~\ref{tbl:fm-to-rtm} to control these lines and ...@@ -189,9 +189,6 @@ INV-TTL outputs as shown in Table~\ref{tbl:fm-to-rtm} to control these lines and
} }
\end{table} \end{table}
Finally, with the proper connections in place as shown in Table~\ref{tbl:fm-to-rtm}, the loopbacks performed by
the RS485 tester as a function of the multiplexer selection lines are shown in Table~\ref{tbl:loopback}.
\begin{table}[h] \begin{table}[h]
\rowcolors{2}{white}{gray!25} \rowcolors{2}{white}{gray!25}
\caption{\label{tbl:fm-to-rtm} Control signals from front to rear-transition module} \caption{\label{tbl:fm-to-rtm} Control signals from front to rear-transition module}
...@@ -225,6 +222,10 @@ the RS485 tester as a function of the multiplexer selection lines are shown in T ...@@ -225,6 +222,10 @@ the RS485 tester as a function of the multiplexer selection lines are shown in T
\end{tabular} \end{tabular}
} }
\end{table} \end{table}
Finally, with the proper connections in place as shown in Table~\ref{tbl:fm-to-rtm}, the loopbacks performed by
the RS485 tester as a function of the multiplexer selection lines are shown in Table~\ref{tbl:loopback}.
The full schematics of the RS485 tester can be found here: The full schematics of the RS485 tester can be found here:
\noindent \noindent
...@@ -237,24 +238,21 @@ The full schematics of the RS485 tester can be found here: ...@@ -237,24 +238,21 @@ The full schematics of the RS485 tester can be found here:
\label{sec:rs485-tester-assy} \label{sec:rs485-tester-assy}
%------------------------------------------------------------------------------ %------------------------------------------------------------------------------
The RTM board tester is composed of two boards: The following items are needed to assemble one RS485 tester card:
\begin{itemize} \begin{itemize}
\item \textbf{the connection board} -- provides the connections in Table~\ref{tbl:loopback} \item \textbf{the connection board} -- provides the connections in Table~\ref{tbl:loopback}
\item \textbf{the support board} -- provides a mechanical support for the Lemo~0S patch-panel \item \textbf{the support board} -- provides a mechanical support for the Lemo~0S patch-panel
connectors used to connect to the RTM, as well as acting as a common voltage reference connectors used to connect to the RTM, as well as acting as a common voltage reference
plane for the shields of these connectors plane for the shields of these connectors
\end{itemize} \item 3x MAX14778 differential multiplexers
\item 9x 1~$\mu$F 0603 SMD capacitors
Apart from these two boards, the following items are needed to assemble one RS485 tester card:
\begin{itemize}
\item 3x M2.5 screws
\item 3x M2.5 standoffs
\item 3x M2.5 hexagonal nuts
\item 4x Lemo EPA.00 straight plugs \item 4x Lemo EPA.00 straight plugs
\item 6x 510~$\Omega$ through-hole resistors \item 6x 510~$\Omega$ through-hole resistors
\item 12x Lemo FAA.0S.302.CLA connectors \item 12x Lemo FAA.0S.302.CLA connectors
\item 3x M2.5 long ($>$ 20~mm) screws
\item 3x M2.5 long ($>$ 10~mm) standoffs
\item 3x M2.5 hexagonal nuts
\end{itemize} \end{itemize}
Follow this procedure in order to assemble the RS485 tester card: Follow this procedure in order to assemble the RS485 tester card:
...@@ -262,7 +260,7 @@ Follow this procedure in order to assemble the RS485 tester card: ...@@ -262,7 +260,7 @@ Follow this procedure in order to assemble the RS485 tester card:
\begin{enumerate} \begin{enumerate}
\item Mount the three MAX14778 multiplexers on their pads: \item Mount the three MAX14778 multiplexers on their pads:
\begin{figure}[h] \begin{figure}[h]
\centerline{\includegraphics[scale=.3]{fig/max14778.jpg}} \centerline{\includegraphics[scale=.33]{fig/max14778.jpg}}
\end{figure} \end{figure}
\item Mount their decoupling capacitors on the other side of the card: \item Mount their decoupling capacitors on the other side of the card:
\begin{figure}[h] \begin{figure}[h]
...@@ -274,9 +272,35 @@ Follow this procedure in order to assemble the RS485 tester card: ...@@ -274,9 +272,35 @@ Follow this procedure in order to assemble the RS485 tester card:
\end{figure} \end{figure}
\pagebreak \pagebreak
\item Cut the legs off resistors and mount them on the top side of the connection board, \item Cut the legs off resistors and mount them on the top side of the connection board,
opposite the multiplexers, on \textbf{input pins I1, I2, I3} opposite the multiplexers, on \textbf{input pins (I1, I2, I3)}
\begin{figure}[h]
\centerline{\includegraphics[scale=.2]{fig/res.jpg}}
\end{figure}
\item Use the cut legs of the resistors or similarly thick metal contacts to make the
\textbf{output connections (Ox1, Ox2, Ox3)}
\begin{figure}[h]
\centerline{\includegraphics[scale=.22]{fig/outp-conn.jpg}}
\end{figure}
\item On the \textbf{support board}, place the 12 Lemo FAA.0S.302.CLA connectors
as shown by the silkscreen on the \textbf{connection board}
\begin{figure}[h]
\centerline{\includegraphics[scale=.13]{fig/lemo0s.jpg}}
\end{figure}
\item Fix the Lemo 0S connectors to the support board using their provided nuts
\begin{figure}[h]
\centerline{\includegraphics[scale=.25]{fig/lemo0s-fix.jpg}}
\end{figure}
\item Fix the support board and the connection boards together using long M2.5 screws,
standoffs between the cards and nuts; make sure you mount them with matching bents in the
boards
\begin{figure}[h]
\centerline{\includegraphics[scale=.25]{fig/conn-to-support.png}}
\end{figure}
\pagebreak
\item Finally, connect the inputs (resistors) and outputs (metal contacts) between the
support and connection boards
\begin{figure}[h] \begin{figure}[h]
\centerline{\includegraphics[scale=.15]{fig/res.jpg}} \centerline{\includegraphics[scale=.1]{fig/conn-to-support-conns.jpg}}
\end{figure} \end{figure}
\end{enumerate} \end{enumerate}
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