# Unable to send triggers through parallel port Windows 7 **URL:** \ **Category:** Uncategorized\ **Created:** [November 9, 2012, 11:06am UTC](https://psychtoolbox.discourse.group/t/unable-to-send-triggers-through-parallel-port-windows-7/404 "2012-11-09T11:06:37Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\ **Post date:** [November 9, 2012, 11:06am UTC](https://psychtoolbox.discourse.group/t/unable-to-send-triggers-through-parallel-port-windows-7/404/1 "2012-11-09T11:06:37Z")
Hello, I am trying to send stimulus triggers using Psychtoolbox to a Biosemi EEG system via parallel port. I am using Window 7 32-bit and Matlab 2009 32-bit. The port address for my LPT port is listed as 00020000. Using the lptwrite function I have entered a number of different port addresses (e.g. 00020000,0200, 200, 0210,210 - both with and without hex2dec) but no triggers are being received by the EEG. I am able to send triggers using different software (Presentation) so I know that the port and the EEG system are working. Any advice would be very much appreciated!! ---
**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\ **Post date:** [November 9, 2012, 2:42pm UTC](https://psychtoolbox.discourse.group/t/unable-to-send-triggers-through-parallel-port-windows-7/404/2 "2012-11-09T14:42:57Z")
p.s. I am using an external parallel port that is listed as LPT 3 in Presentation software its address is listed as 0x2010 > --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "Cora" \ wrote: > \> > \> Hello, I am trying to send stimulus triggers using Psychtoolbox to a Biosemi EEG system via parallel port. I am using Window 7 32-bit and Matlab 2009 32-bit. The port address for my LPT port is listed as 00020000. Using the lptwrite function I have entered a number of different port addresses (e.g. 00020000,0200, 200, 0210,210 - both with and without hex2dec) but no triggers are being received by the EEG. I am able to send triggers using different software (Presentation) so I know that the port and the EEG system are working. Any advice would be very much appreciated!! > \> ---
**Author:** ![e\_flister](https://avatars.discourse-cdn.com/v4/letter/e/e36b37/32.png) [@e\_flister](https://psychtoolbox.discourse.group/u/e_flister)\ **Post date:** [November 9, 2012, 4:31pm UTC](https://psychtoolbox.discourse.group/t/unable-to-send-triggers-through-parallel-port-windows-7/404/3 "2012-11-09T16:31:47Z")
where are you seeing that address? you say '00020000' first, but then you say '0x2010' -- what changed? what is an 'external parallel port'? an add-on PCI card? did you follow all the instructions at [http://psychtoolbox.org/FaqTTLTrigger?](http://psychtoolbox.org/FaqTTLTrigger?) did you disable UAC? -e > --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "Cora" \ wrote: > \> > \> p.s. I am using an external parallel port that is listed as LPT 3 in Presentation software its address is listed as 0x2010 > \> > \> --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "Cora" \ wrote: > \> \> > \> \> Hello, I am trying to send stimulus triggers using Psychtoolbox to a Biosemi EEG system via parallel port. I am using Window 7 32-bit and Matlab 2009 32-bit. The port address for my LPT port is listed as 00020000. Using the lptwrite function I have entered a number of different port addresses (e.g. 00020000,0200, 200, 0210,210 - both with and without hex2dec) but no triggers are being received by the EEG. I am able to send triggers using different software (Presentation) so I know that the port and the EEG system are working. Any advice would be very much appreciated!! > \> \> > \>