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Cortex only runs program when connected computer 
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Joined: Tue Mar 12, 2013 6:31 pm
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Post Cortex only runs program when connected computer
Our programs only run when the cortex is connected to the computer by the orange USB cable. When we disconnect the cable the cortex flashes orange lights and never starts the program when we turn on the power switch. We have updated teh firmware and the computer says the cortex has the lastest version of firmware. Colud the problem be low battery? We have the same problem on all 18 cortex's.


Tue Mar 12, 2013 6:39 pm
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Joined: Thu May 24, 2012 12:15 pm
Posts: 566
Post Re: Cortex only runs program when connected computer
When we see this problem, it is usually because the VEX Cortex Communication Mode is set to 'VEXNet or USB' or 'Competition (VEXNet)' instead of 'USB Only'. To solve this issue, navigate to the VEX Cortex Communication Mode menu (under the Robot menu inside of ROBOTC) and change the selection to 'USB Only'.

You will then need to download a program to the robot (over USB) and power cycle the Cortex (turn the robot off, unplug the battery, and remove the USB cable; then plug the battery back in and turn the robot back on).

You will need to do this for each Cortex that is effected by the mode change. This process is also outlined in our 'Cortex Setup Guide' on our wiki, under Step 4: Setting Cortex Communication Mode.

Cortex Setup Guide

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Wed Mar 13, 2013 9:34 am
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Joined: Wed Apr 17, 2013 11:02 pm
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Post Re: Cortex only runs program when connected computer
I am having the same problem. The setup guide does not show how to set up the joystick controller. It simply shows how to power cycle the microcontroller. I have tried every configuration, combination, turning off and turning on I can think of to get the cortex and joystick to work wirelessly. Can someone give me step by step instructions for setting up the joystick?


Wed Apr 17, 2013 11:09 pm
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Joined: Tue May 07, 2013 11:33 am
Posts: 1
Post Re: Cortex only runs program when connected computer
cortex is jumping through the code, it is not a smooth transition when unpluged from pc. Program is written via sec timing per motor/s
What am I over looking?


Tue May 07, 2013 11:39 am
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