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Author Topic: Testing LPT Port  (Read 6191 times)

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Re: Testing LPT Port
« Reply #10 on: March 06, 2008, 01:59:20 PM »
EXCELLENT  8)
I got that from Chip in an earlier topic.
Thanks to Chip, ;)
RC

Offline jimpinder

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Re: Testing LPT Port
« Reply #11 on: March 06, 2008, 02:39:23 PM »
As a matter of course, it is no good trying to test your LPT1 socket using the motor driver outputs. Since the outputs are pulsed, depending on speed, the voltage you see on the output pins will vary.

It is better to configure Mach 3 to put out M3, M4, M7 or M8 signals  to pins. These are constant signals, either on or off, and are much easier and more reliable to test.
Not me driving the engine - I'm better looking.
Re: Testing LPT Port
« Reply #12 on: March 06, 2008, 02:42:29 PM »
I think that's why the dir. pin was specified. One dir. is high and the other is low..no pulse.
If I followed correctly.....if.
RC

Offline Chip

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Re: Testing LPT Port
« Reply #13 on: March 06, 2008, 03:41:29 PM »
Hi, RC

That's correct, When testing motor output's, " Dir " pin's are used as thy will be high 5 volt's in one dir. and 0 volt's the other direction.

Jim, Step pulse's you need a Scope to see them, I'll agree.

Thanks, Chip

Offline Hood

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Re: Testing LPT Port
« Reply #14 on: March 06, 2008, 04:52:37 PM »
Actually you can use a voltmeter as a crude way of seeing the step pulse, set to a mV range and go at different feed rates. The faster you go the higher the voltage, as I said its crude but can be handy for guys without scopes as a rough guide.
Hood