Parallel port limitation

[pcf]

Does anyone know whats the limit of the parallel port (current source and
sink characteristics)

Thanks,

[Labviewguru]

You can find this information in a number of resources. Try "Upgrading and Repairing PCs" and other such hardware reference materials. This forum is probably not going to be your best source of information for those specifications.

[Helmut Hullen]

Hallo, pcf,

Du (pcfnet) meintest am 18.07.02:

> Does anyone know whats the limit of the parallel port (current
> source and sink characteristics)

That depends.
There is no strict design order - every chip designer can make its own
design.

If you use a port on a laptop or a port which ist powered directly by an
on board chip: be careful. Replacing a burned chip may be hard work.

Greetings!
Helmut

Please excuse my gerlish!

[DougD]

pcf:

Current limits are pretty low for parallel ports, I believe on the
order of <100mA but I'm not absolutely sure so be sure to check out
the website I'm going to mention in a minute. Remember these parallel
port chips are basically just regular 5V TTL. Laptops are even lower
because of lower operating voltages (3.3) and CMOS implementations.
You may need to build a driver circuit with some opto-isolation
protection for your PC if you are trying to drive more current than
100ma per line.

The best place to check for parallel port information is Lakeview
Research's ww.lvr.com/parport.htm Jan Axelson's "Parallel Port
Complete" is the best text on the subject and reasonably cheap (about
$25) and the website is her website with a lot of links for parallel

port information.

Lakeview Research's website also has information on serial (RS-232)
and USB interfacing as well. www.lvr.com

Douglas De Clue
LabVIEW developer
ddeclue@bellsouth.net


"pcf" wrote in message news:...
> Does anyone know whats the limit of the parallel port (current source and
> sink characteristics)
>
> Thanks,