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<title>JMRI: Speedometer - Using the serial port for block sensors</title>
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<h1>Speedometer</h1>
<h2>Using the serial port for Block Sensors</h2>
Jim Scorse has provided a schematic for connecting an NCE block detector to the serial
port.<br>
<img src="images/speed0.jpg" width="400" height="300" alt="circuit diagram">
<h3>DB9 and DB25 connections</h3>
<pre>
DB9 pin DB25 pin
------- --------
DCD 1 8
RxD 2 3
TxD 3 2
DTR 4 20
ground 5 7
DSR 6 6
RTS 7 4
CTS 8 5
RI 9 22
</pre>
<p>Back to the <a href="index.shtml">Speedometer main Help page</a>.</p>
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