install_additional_sensors.php

Linux嵌入式设计配套光盘,学习嵌入式设计可参考

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include_once "../layout.php";

$widget = <<< WIDGET_END
        <h2> How To Install Additional Alarm Sensors </h2> 
<p>
A standard PC parallel port has five input pins.  Laddie
uses these input pins and so Laddie can have up to five
zones.
</p>
<p>
The wiring diagram for each sensor is the same:<br>
<center><img border="1" src="sensor.gif"></center>
</p>
<p>
You can use the standard parallel port for both Ground and
for +5 volts (or 3.3 volts, depending on your hardware).
The following table shows which pins on the parallel port to
use for each of the five alarm zones.
</p> 
<p>
<center><table width="50%">
<tr><th>Zone</th><th>+5 Volts</th><th>Input</th><th>Ground</th></tr>
<tr><th>1</th><th>2</th><th>15</th><th>18</th></tr>
<tr><th>2</th><th>3</th><th>13</th><th>19</th></tr>
<tr><th>3</th><th>4</th><th>12</th><th>20</th></tr>
<tr><th>4</th><th>5</th><th>10</th><th>21</th></tr>
<tr><th>5</th><th>6</th><th>11</th><th>22</th></tr>
</table></center>
</p>
<p>
Please see the Laddie User's Manual for a description of
normally open versus normally closed sensors, and for a
description of how to connect multiple sensors in a zone.
WIDGET_END;

display_page("Help", "item1", $widget);

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