Sending sub-millisecond TTL pulses through parallel port

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Sending sub-millisecond TTL pulses through parallel port

Sending sub-millisecond TTL pulses through parallel port

Author	Message
aMargolis	aMargolis posted 7 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 2, Visits: 2	Hi guys, This is just a quick one. I am using a stimulation device which is operated through the parallel port. In order to program the intensity of the stimulation, I need to set the control pin to "high" for 0.5ms or less, and then set it back to "low". This tells the device that I'm about to send it intensity data. However it doesn't seem possible to send sub-millisecond pulses through the parallel port using Inquisit 4. Can anybody confirm this? Many thanks,
	Reply Like 73
Dave	Dave posted 7 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 12K, Visits: 98K	+x aMargolis - Wednesday, January 11, 2017 Hi guys, This is just a quick one. I am using a stimulation device which is operated through the parallel port. In order to program the intensity of the stimulation, I need to set the control pin to "high" for 0.5ms or less, and then set it back to "low". This tells the device that I'm about to send it intensity data. However it doesn't seem possible to send sub-millisecond pulses through the parallel port using Inquisit 4. Can anybody confirm this? Many thanks, > However it doesn't seem possible to send sub-millisecond pulses through the parallel port using Inquisit 4. Can anybody confirm this? Yes, that is correct / I can confirm. I'm surprised by the 0.5 millisecond requirement of your device, though, because timing error for parallel ports are generally on the order of ~1ms, i.e. 0.5 ms would fall well below a typical parallel port's timing accuracy. Have you tried if the device accepts the intensity data even if you raise the control pin for longer than 0.5 ms?
	Reply Like 59
aMargolis	aMargolis posted 7 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 2, Visits: 2	+x Dave - Wednesday, January 11, 2017 +x aMargolis - Wednesday, January 11, 2017 Hi guys, This is just a quick one. I am using a stimulation device which is operated through the parallel port. In order to program the intensity of the stimulation, I need to set the control pin to "high" for 0.5ms or less, and then set it back to "low". This tells the device that I'm about to send it intensity data. However it doesn't seem possible to send sub-millisecond pulses through the parallel port using Inquisit 4. Can anybody confirm this? Many thanks, > However it doesn't seem possible to send sub-millisecond pulses through the parallel port using Inquisit 4. Can anybody confirm this? Yes, that is correct / I can confirm. I'm surprised by the 0.5 millisecond requirement of your device, though, because timing error for parallel ports are generally on the order of ~1ms, i.e. 0.5 ms would fall well below a typical parallel port's timing accuracy. Have you tried if the device accepts the intensity data even if you raise the control pin for longer than 0.5 ms? Thanks for the reply. It is strange that it requires a 0.5ms pulse, I agree, but I have an email from the manufacturer confirming that this is the case. I have tried longer pulses but unfortunately they don't work... Thanks for your help anyway, I guess I'll have to look for a different approach.
	Reply Like 79