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Unread 02-03-2010, 22:05
Radical Pi Radical Pi is offline
Putting the Jumper in the Bumper
AKA: Ian Thompson
FRC #0639 (Code Red Robotics)
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Re: Black Jaguar CAN Issues

Quote:
Originally Posted by Mark McLeod View Post
You see the problem. This is a CAN-bus we're dealing with, not an alternating CAN/RS232 hybrid. A CAN-port won't talk to an RS232-port of course, they speak different languages.

The Black Jaguars are intended only as a converter from RS232 to CAN at the start of an uninterrupted CAN bus, they don't have enough CAN ports to form a traditional CAN daisy chain, only the Gray's have the CAN ports to continue a daisy chain.
That's not quite true. While CAN and RS232 are completely different, the wires for them are also completely different. If you put together the RS232 to CAN adapter, you put a resistor between the Red and Green wires. Those are the 2 CAN wires. All the other ones plugged into the DB-9 connector are the Serial wires. As long as the CAN to CAN cables were assembled properly (double check that btw), 2 Black Jags should be able to be on the same bus.

Also, try messing with your configuration. Change the order of jags daisy-chained, try a different jag as the serial to CAN, swap around cables. You might have happened to put a bad connection between the source black jag and the 2nd one, breaking the bus
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