I need to send a +5V pulse to the pin 2 of my parallel port, for about 1 sec, just at the end of the presentation of a 4-sec duration picture.

I added an Inline after the Image Display, and wrote:

WritePort &H378, 0

WritePort &H378, 1 (I also tried with 255)

However, I did not record any output signal.

What can be the problem?

How to set the duration of the pulse?

Thank to help me.

Stéphanie

Assuming your parallel port is configured for output, then pins 2-9 will represent the byte sent via the WritePort method, provided that you have also connected a ground to one of the pins 19-25.  So a loop as follows would create a 1 second 50% duty cycle square wave.

Dim x As Long
For x = 1 To 10
 WritePort &H378, 1
 Sleep 500
 WritePort &H378, 0
 Sleep 500
Next 'x

References...
Sample: Parallel Port Configure
KB1316 - INFO: How do I send a signal to an external device?
KB1318 - INFO: How do I notify external equipment at the exact time that an event occurs in E-Prime?
KB1320 - INFO: General Parallel Port Information

-Brandon