87 lines
3.4 KiB
TeX
87 lines
3.4 KiB
TeX
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\appendix
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\chapter{Hardware}
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\section{Installation}
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To install the VT132 in a RC2014 or a compatible system, place it in a standard or extended bus socket.
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If your backplane does not offer an extended bus, the modem cannot be used via bus pins, instead the modem FTDI header has to be used.
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The extended bus pins are not used for other purposes.
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\textbf{On a new VT132, the NVR (Non-volatile RAM) is not initialized.}
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At power-on or reset, following the \textbf{Wait} message, a new VT132 will display \textbf{Error} along with a series of bells.
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This is expected because the NVR has not been initialized.
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Once you write settings to the NVR, this error should not persist.
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\section{Jumper settings and headers}
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The board features the following jumpers:
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\begin{tabular}{p{7em} | p{0.71\textwidth}}
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\hline
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\textbf{Jumper} & \textbf{Function} \\
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\hline
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JP1 RxA & \multirow{2}{*}{Connect terminal to port A on bus pins} \\
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JP2 TxA \\
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\hline
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JP3 RxB & \multirow{2}{*}{Connect modem to port B on ext. bus pins} \\
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JP4 RxB \\
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\hline
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JP5 Pwr FTDI & Connect Power to FTDI +5V pin \\
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\hline
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JP6 Pwr Modem & Connect Power to modem FTDI +5V pin \\
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\hline
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\end{tabular}
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Enabling JP1 and JP2 is highly advised, as the VT100 terminal serial connection is not available on a FTDI header.
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If you want to provide power to, or take power from either of the 6 pin headers then JP5 and JP6 will provide power
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or isolate the \texttt{Vcc} pin in the \texttt{FTDI Program} and \texttt{Modem Port B} 6-pin headers respectively.
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\textbf{Warning:} You should normally only connect one power source to the system at a time.
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\begin{tabular}{ c | p{0.38\textwidth} || c | p{0.38\textwidth}}
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\hline
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\multicolumn{2}{ l || }{FTDI Program} & \multicolumn{2}{ l }{Modem Port B} \\
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\hline
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\textbf{Pin} & \textbf{Function} & \textbf{Pin} & \textbf{Function} \\
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\hline
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1 & GND & 1 & GND \\
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2 & not connected & 2 & CTS \\
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3 & Vcc (+5V) & 3 & Vcc (+5V) \\
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4 & Tx & 4 & Tx \\
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5 & Rx & 5 & Rx \\
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6 & not connected & 6 & RTS \\
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\hline
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\end{tabular}
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If your RC2014 serial module uses the RTS/CTS pins, you can disable JP3+4 and use jumper wires to connect the \textbf{Modem Port B} of the VT132 to your serial module,
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as no bus pins are assigned to RTS/CTS.
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The \textbf{FTDI Program} header outputs debug messages from the ESP32 microcontroller. You can connect another terminal (or a PC) to watch the debug output.
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The output uses 115.200 baud, 8 data bits, no parity, 1 stop bit (8-N-1).
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It is also possible to flash the ESP32 via this header. To enable the \textit{programming mode}, press and hold \textbf{Reset}, press and hold \textbf{Prog}, release \textbf{Reset}
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and release \textbf{Reset}. Another firmware can now be uploaded, eg. via \texttt{esptool}.
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\newpage
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\section{Buttons}
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The VT132 module offers two buttons:
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\begin{itemize}
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\item Reset
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\item Prog
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\end{itemize}
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The hardware \textbf{Reset} button on the PCB reboots the ESP32 (EN line reset). This will cause both the VT100 terminal and the modem to reset.
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Any unsaved settings (terminal and/or modem settings) will be lost.
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\textit{Note:} The computer connected to the VT132 will not be reset, so after the reset, you will be in the same program as before.
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The hardware \textbf{Prog} button is used to switch the baud rate of the modem. After each press of this button, the modem outputs its new
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baud rate to the serial port - so you can press this button repeatedly until you can read your baud rate.
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