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<?xml-stylesheet type="text/xsl" href="https://community.arm.com/utility/feedstylesheets/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/"><channel><title>Centronics printer printing junk value</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/40620/centronics-printer-printing-junk-value</link><description> 
I am interfacing Epson LX-300 printer with 8051 using the parallel
port. I have used 8 data lines, i strobe and 1 busy line for this
purpose. I am able to send data to printer and it works fine. The
issue I am facing is the following: 

 
The printer</description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: Centronics printer printing junk value</title><link>https://community.arm.com/thread/68758?ContentTypeID=1</link><pubDate>Tue, 01 Jul 2014 01:30:40 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:20b47376-6b48-40f7-8547-7882eedacbd0</guid><dc:creator>ImPer Westermark</dc:creator><description>&lt;p&gt;&lt;p&gt;
The standard rule about designing hardware: what state will the
pins take when the unit isn&amp;#39;t powered? What state will they take when
the processor is powered but in reset state? Is these states
compatible with connected hardware? Any need for pull-up? Any need
for pull-down? Any need for inverting some signal?&lt;/p&gt;

&lt;p&gt;
The goal is obviously to make sure that all signals will stay in
their idle state when the device isn&amp;#39;t powered or is reset, to avoid
creating any glitches.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: Centronics printer printing junk value</title><link>https://community.arm.com/thread/62939?ContentTypeID=1</link><pubDate>Tue, 01 Jul 2014 01:14:18 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:2d3b64ac-2006-433a-b8d6-bf2530e898c8</guid><dc:creator>A 23</dc:creator><description>&lt;p&gt;&lt;p&gt;
change your code to output null data when it is switched off.&lt;/p&gt;

&lt;p&gt;
or change the hardware.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>