# Digitalio TTL Trigger

**URL:** <https://psychtoolbox.discourse.group/t/digitalio-ttl-trigger/313>\
**Category:** Uncategorized\
**Created:** [June 12, 2013, 3:44pm UTC](https://psychtoolbox.discourse.group/t/digitalio-ttl-trigger/313 "2013-06-12T15:44:01Z")\
**Posts on this page:** 1\
**Page:** 1

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**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:** [June 12, 2013, 3:44pm UTC](https://psychtoolbox.discourse.group/t/digitalio-ttl-trigger/313/1 "2013-06-12T15:44:01Z")

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Hi,  
  
Trying to trigger a 5V TTL pulse from my PC to a Magstim device to trigger a 0.2s train of pulses, but I can't get my code to work.  
  
dio = digitalio('parallel','LPT1');  
addline(dio,0:7,'out');  
line=1;  
putvalue(dio.line(line),0);  
putvalue(dio.line(line),1);  
putvalue(dio.line(line),0);  
  
Please help!  
  
Sam