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Unread 08-03-2011, 15:14
jhersh jhersh is offline
National Instruments
AKA: Joe Hershberger
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Re: Unexplained intermittent CAN / 2CAN Jaguar problems at GSR

Quote:
Originally Posted by WizenedEE View Post
Source Please? I'm looking here:

<R59> If CAN-bus communications are used, the CAN-bus must be connected to the cRIO-FRC through either the Ethernet network connected to Port 1, Port 2, or the DB-9 RS-232 port connection.

And

<R50> Connections to the cRIO-FRC Ethernet ports must be compliant with the following parameters:
A. The DAP-1522 radio is connected to the cRIO-FRC Ethernet port 1 (either directly or via a CAT5 Ethernet pigtail).
B. Ethernet-connected COTS devices or custom circuits may connect to either cRIO-FRC Ethernet port; however, these devices may not transmit or receive UDP packets using ports 1100-1200 except for ports 1130 and 1140.

That seems to be two conflicting rules, but the 2CAN would probably count as a "pigtail"
I don't see these as conflicting. A pigtail is simply a wire, not an active component like the 2CAN. The 2CAN does not count as a pigtail. It still doesn't matter, however, since you can plug the 2CAN into one of the other ports on the DAP-1522 switch, not in between the radio and the cRIO.

Quote:
Originally Posted by WizenedEE View Post
Hooray for rules quotations. I am confused about in rule <R59> they say the radio may be connected directly OR with a pigtail. Them female to female connections, eh?

(Yeah, yeah I know, a pigtail is a male-female...)
The idea of the pigtail for this application is obsolete and probably should be removed from the rules. Instead of ever unplugging your cRIO from your radio, you should instead have a pigtail from one of the other ports on the DAP-1522 that you use to tether to your DS in the pits. This means you will never forget to plug the radio back in and miss a match (or delay it if your FTA is especially generous).

-Joe
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