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8. VEXnet Troubleshooting Flowchart
Start
Do
both units turn
NO
on?
YES
Is the
Joystick LED
YES
red?
NO
Are both
VEXnet LEDs
NO
on?
YES
Single
or double
Double
blink?
Lost VEXnet link.
No VEXnet key detected.
Check key connection
and replace key if
necessary. Powercycle
unit when finished.
If the issue is still present after following this guide, update both the Cortex and
Joystick with the most recent version of the VEXnet Firmware (Master CPU
Firmware for ROBOTC users). If this does not resolve the problem, try using
a different set of VEXnet keys. If you need further assistance you can post a
question on the VEX Forum (vexforum.com) or contact VEX Technical Support
by phone at +1-903-453-0802 or email support@vexrobotics.com.
Page 11 of 14
Cortex Microcontroller and VEXnet Joystick User Guide
Check batteries
and power
connections.
Is the
Joystick LED
solid?
NO
Update the VEXnet Firmware (Master CPU Firmware for ROBOTC users)
on both the Cortex and the Joystick using the Firmware Upgrade Utility
included with your programming software. This utility is also available on the
Downloads Page at vexrobotics.com.
What color
is the VEXnet
Red
LED?
Single
VEXnet
LED flashing multiple
colors?
Poor signal strength.
Signal may be blocked or units
may be out of range. Consider
moving key to a better location or
consider moving the Cortex closer
to the Joystick.
Joystick batteries are
dead. Replace batteries
YES
before continuing.
longer than 20
Flashing
seconds?
Yellow
Other
Is
NO
YES
Pair Cortex and Joystick.
For
For instructions, refer to
Section 1 of the Cortex
YES
User Guide.
NO
Units are establishing
VEXnet link. No action
Units are correctly
linked. If the problem
persists, check user code
or try using the Default
Code which is available
from within your
programming software.
required.
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