[SunHELP] URGENT: TTL pulse on serial or parallel port

[James Fogg]

To the best of my recollection, RS232 (most serial ports) the signal level is
+15v and -15v (zero volts is a bogus state). Many ports actually use +12v and
-12v because of the power supply installed in the machine. You could build a
quick and tiny voltage regulator though.

I never worked with parallel at that level of detail.

On Thu, 19 Apr 2001, THOU SPAKE:
> Hi,
> 
> I would like to give out a ttl pulse
> (length anything between 50-300 ms,
> signal change from constant 0-5V to
> any other value within 0-5V) on either
> a serial port or the parallel port on
> an Ultra2.
> 
> Does anybody have a hint on how to do this
> or where to get information about this.
> 
> Thanks,
> Wolfgang
> 
> 
> 
> 
> #####
> # Wolfgang Engelien                       
> # Tel.: +1 (212) 746 3724
> # Fax.: +1 (212) 746 5818
> # email: wolfgang at hanazono.med.cornell.edu
> #####
> _______________________________________________
> SunHELP maillist  -  SunHELP at sunhelp.org
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	 James D. Fogg, Network Engineer
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