# Itc-18 ttl out **URL:** \ **Category:** Support\ **Created:** [February 18, 2013, 2:51pm UTC](https://mworks.discourse.group/t/itc-18-ttl-out/628 "2013-02-18T14:51:45Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\ **Post date:** [February 18, 2013, 2:51pm UTC](https://mworks.discourse.group/t/itc-18-ttl-out/628/1 "2013-02-18T14:51:45Z")
We setup mworks and the ITC-18 like described on the mworks webpage… trying to get a TTL OUT measured with an oscilloscope was unsuccessful… changing “pulse\_active\_high” to “pulse\_active\_low” does not change our initial readout once the ITC-18 is initiated we set our system (OS X 10.8.2) to run 32 bit mode below the simple test script \ ---
**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\ **Post date:** [February 18, 2013, 4:47pm UTC](https://mworks.discourse.group/t/itc-18-ttl-out/628/2 "2013-02-18T16:47:21Z")
Hi Athanasia, I’m out of the office today, so I don’t have an ITC on hand to test your example. But I think if you replace `pulse_active_low` with `digital`, you’ll get the behavior you expect. Also, you probably should add another wait after setting TTL0 back to zero, just to make sure the update is sent to the device before you stop I/O. Regards, Chris Stawarz ---
**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\ **Post date:** [February 19, 2013, 12:52pm UTC](https://mworks.discourse.group/t/itc-18-ttl-out/628/3 "2013-02-19T12:52:39Z")
Thank you for your e-mail. Best regards, Athanasia Palasantza ---
**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\ **Post date:** [March 4, 2013, 1:30pm UTC](https://mworks.discourse.group/t/itc-18-ttl-out/628/4 "2013-03-04T13:30:50Z")
Hello, We have tried the aux out on the back of the ITC18: out0 and ground (pin 3 and 4) and also the usb dig I/O: TTL out0 and ground (pin 36 and 35). We expected to have TTL0 to a high value value (5-10) for 1 sec, but it did not work. Could you possibly tell us what are we doing wrong? I have also attached the xml code we are testing. Best regards, Athanasia Palasantza * * * Από: Christopher Stawarz [tender+d452a3758265330195e3be8214a755cc56bcfbf2e@tenderapp.com] Αποστολή: Δευτέρα, 18 Φεβρουαρίου 2013 5:47 μμ To: Athanasia Palasantza Θέμα: Re: ITC-18 TTL OUT [Questions #74] ---
**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\ **Post date:** [March 4, 2013, 1:30pm UTC](https://mworks.discourse.group/t/itc-18-ttl-out/628/5 "2013-03-04T13:30:50Z")
Attachment: [ITC\_Test.xml](https://mworks.discourse.group/uploads/short-url/j1zbC5qY4qilZNiVRvwyXncMPjO.xml) (1.59 KB) ---
**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\ **Post date:** [March 4, 2013, 6:07pm UTC](https://mworks.discourse.group/t/itc-18-ttl-out/628/6 "2013-03-04T18:07:28Z")
Hi Athanasia, I tried your experiment on my setup, and it works as expected, producing an oscillating TTL signal with a period of 2 seconds on auxiliary output pin 0. What happens if you leave your wires where they are, but change your experiment to use ITC18\_TTL\_ASYCH\_OUT14 or ITC18\_TTL\_ASYCH\_OUT15? If that works, then one of us has our pin numbering backwards. Also, what version of MWorks are you using? Chris ---
**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\ **Post date:** [March 5, 2013, 10:00am UTC](https://mworks.discourse.group/t/itc-18-ttl-out/628/7 "2013-03-05T10:00:17Z")
Thank you very much for your response. We will try it again with the changes you suggested. We are using release 0.4.5. Best regards, Athanasia * * * Από: Christopher Stawarz [tender+d452a3758265330195e3be8214a755cc56bcfbf2e@tenderapp.com] Αποστολή: Δευτέρα, 4 Μαρτίου 2013 7:07 μμ To: Athanasia Palasantza Θέμα: Re: ITC-18 TTL OUT [Questions #74] ---
**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\ **Post date:** [July 19, 2022, 11:30pm UTC](https://mworks.discourse.group/t/itc-18-ttl-out/628/8 "2022-07-19T23:30:22Z")