Thread: Intermittent connection on field only
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Unread 11-05-2012, 14:06
linuxboy linuxboy is offline
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AKA: Oliver Graff
FRC #3780
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Join Date: Nov 2010
Rookie Year: 2009
Location: MI, USA
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Re: Intermittent connection on field only
Quote:
Originally Posted by Al Skierkiewicz View Post
Oliver,
The nature of the signaling on the CAN bus uses switching in the transceivers to cause a device to enter a 'dominant' state for transmit and a 'recessive' state for receive. It is my understanding this is accomplished by driving the bus in a way that causes current flow in the terminating resistors. The CAN terminating resistors also provide the transmission line termination to allow 1 Mb/s traffic on a buss 40 meters long. Microchip has a nice application note, AN228, describing one of their products and the CAN signaling.
I will talke a look at the info about that chip, thanks! My comments are based purely on observation of the behavior in certain fault conditions with the FRC control system. I don't know exactly how the internals of CAN work (yet, this is what the offseason is for!).

- Oliver