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FAQs / Re: Steppers stutter or stop when using computer
« on: April 02, 2011, 12:50:48 PM »
Hi Novec,
Welcome to the forum.
A problem which is coming up more and more now is that the newer parallel ports only output 3.3 Volts TTL and many breakout boards have opto-isolators which require the old 5 Volt TTL standard.
If you have a multimeter and can measure between GND (pins 18 to 25) and any axis direction pin, then when jogging the voltage should be either 0 Volts (for one direction) or 5 Volts (in the other direction). If you are getting a reading of only 3.3 Volts then check with Keling on the spec of their KL-DB25.
Assuming 3.3 Volts - If you have a spare PCI slot a 5 Volt parallel port could always be added to your system.
Hope this helps,
Tweakie.
Welcome to the forum.
A problem which is coming up more and more now is that the newer parallel ports only output 3.3 Volts TTL and many breakout boards have opto-isolators which require the old 5 Volt TTL standard.
If you have a multimeter and can measure between GND (pins 18 to 25) and any axis direction pin, then when jogging the voltage should be either 0 Volts (for one direction) or 5 Volts (in the other direction). If you are getting a reading of only 3.3 Volts then check with Keling on the spec of their KL-DB25.
Assuming 3.3 Volts - If you have a spare PCI slot a 5 Volt parallel port could always be added to your system.
Hope this helps,
Tweakie.