# Plecs and TI C2000 MCU Communication Issue

**URL:** <https://forum.plexim.com/t/plecs-and-ti-c2000-mcu-communication-issue/1654>\
**Category:** TI C2000\
**Tags:** c2000\
**Created:** [January 5, 2025, 8:35pm UTC](https://forum.plexim.com/t/plecs-and-ti-c2000-mcu-communication-issue/1654 "2025-01-05T20:35:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Sachith](https://avatars.discourse-cdn.com/v4/letter/s/a3d4f5/32.png) [@Sachith](https://forum.plexim.com/u/Sachith)\
**Post date:** [January 5, 2025, 8:35pm UTC](https://forum.plexim.com/t/plecs-and-ti-c2000-mcu-communication-issue/1654/1 "2025-01-05T20:35:34Z")

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Hi,

I am trying to configure TI C2000 MCU using PLECS. According to the tutorial provided for “External Mode and Parameter Inlining,” I am trying to implement that example demo. However, my LED was blinking but the inline communication was not working. I am using a F280039C control card and have correctly set the RX and TX SCI pins. Also, I can see the auxiliary and debugging port in the Device Manager and have tried with both ports. I have got the following error message. For reference, I have attached the images. Please help me to find out the issue.

 ![Simulation](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/2X/e/e729c212e4eef380a6aa98b08820a123ffdd6f02.jpeg)  
 ![Error message](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/2X/5/5f10c620ab2dd81718f47e14e5264844d54c96f3.jpeg)  
 ![Ports](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/2X/f/fe428f327f2f98d623d29c0d96c764ce620fa104.jpeg)  
 ![Config1](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/2X/1/168e46dc0da11c374e5ea47a2d9f277cbe131ee0.jpeg)  
 ![Config2](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/2X/e/e5c0f8d3a1c981605b524bd5259835706a7d3582.jpeg)  
 ![config3](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/2X/c/cea62293b3c229b8a09a57574cfefa8fc60fac2f.jpeg)  
Thank you.

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**Author:** ![Bryan\_Lieblick](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/bryan_lieblick/32/10_2.png) [@Bryan\_Lieblick](https://forum.plexim.com/u/Bryan_Lieblick)\
**Post date:** [January 6, 2025, 9:30pm UTC](https://forum.plexim.com/t/plecs-and-ti-c2000-mcu-communication-issue/1654/2 "2025-01-06T21:30:16Z")

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Sachith and I discussed offline and it turned out to be an issue with the default DIP switch settings of the 280039C ControlCARD. S1:A-2 needs to be switched to the ON position, as documented in the " Tips for Programming C2000 Development Kits" section of the Target Support Documentation Help.

 ![image](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/2X/4/48e7af544aa94d980f093bb670b23b59e1aa7d39.png)