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Unread 05-12-2013, 15:00
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Mark McLeod Mark McLeod is offline
Just Itinerant
AKA: Hey dad...Father...MARK
FRC #0358 (Robotic Eagles)
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Re: Reimaging the cRIO - Help!

Where did you get your (what look to be) all black PWM cables?
Did you purchase them or make them yourself?
I can't see how they are marked to identify which of the three wires is the signal, and which is the ground wire. Getting those mixed up as wilsonmw04 suggested will of course prevent the Jags from getting the command signal.

If the Jags have an orange blinking light (after your battery is recharged), then the power to the jags is fine, and the trouble is likely in the chain of command.
  • Code must Open PWM 1 and PWM 2 (this will be proven just by PWM1 and PWM 2 showing up in test mode) Make sure they are not Opened more than once.
  • The Driver Station must be Enabled of course
  • The 37-pin ribbon cable from the cRIO module to the Digital Sidecar must be secure and correct. Sometimes a potential source of trouble.
  • The Digital Sidecar must be receiving 12v power from the Power Distribution Board and the three green power lights on the Sidecar must be bright green (it appears to be so wired from the photo)
  • You can test the Sidecar PWM pins with a multimeter to see that the outer two are providing a signal. Neutral will give a reading of ~1.5v, and full power in test mode will read about 2.3v on a multimeter.
  • The PWM cable must be correctly oriented to get the command signal from the Sidecar to the correct Jag pin. Signal pin is towards the side edge of the Jag. At the Sidecar the Signal pin is the inside pin.
  • The PWM cable could be faulty. You can test the Jag end of the PWM cable with a multimeter to be sure the outer two pins are providing some signal. Same voltages as before.
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Last edited by Mark McLeod : 05-12-2013 at 21:12.
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