Go to Post For some strange reason, people always seem to spell my last name incorrectly. I'm not really sure why. - Karthik [more]
Home
Go Back   Chief Delphi > Technical > Control System
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Reply
Thread Tools Rate Thread Display Modes
  #1   Spotlight this post!  
Unread 30-09-2014, 09:11
jman4747's Avatar
jman4747 jman4747 is offline
Just building robots
AKA: Josh
FRC #4080 (Team Reboot)
Team Role: CAD
 
Join Date: Apr 2013
Rookie Year: 2011
Location: Atlanta GA
Posts: 419
jman4747 has a reputation beyond reputejman4747 has a reputation beyond reputejman4747 has a reputation beyond reputejman4747 has a reputation beyond reputejman4747 has a reputation beyond reputejman4747 has a reputation beyond reputejman4747 has a reputation beyond reputejman4747 has a reputation beyond reputejman4747 has a reputation beyond reputejman4747 has a reputation beyond reputejman4747 has a reputation beyond repute
CAN wiring question

So after reading up on the CAN bus outside of the preview of FIRST I realized the wiring of a normal CAN bus is not series it is parallel like I2C for instance. Why do we do it in series? It would seem like parallel would provide more reliability.
I hope this isn't an obvious question and I'm just missing something but it seems off.

Added a photo displaying a non FRC CAN network.
Attached Thumbnails
Click image for larger version

Name:	800px-CAN-Bus_Elektrische_Zweidrahtleitung.svg.png
Views:	86
Size:	15.4 KB
ID:	17349  
__________________
---------------------
Alumni, CAD Designer, machinist, and Mentor: FRC Team #4080

Mentor: Rookie FTC Team "EVE" #10458, FRC Team "Drewbotics" #5812

#banthebag
#RIBMEATS
#1620
Reply With Quote
  #2   Spotlight this post!  
Unread 30-09-2014, 09:21
Mark McLeod's Avatar
Mark McLeod Mark McLeod is offline
Just Itinerant
AKA: Hey dad...Father...MARK
FRC #0358 (Robotic Eagles)
Team Role: Engineer
 
Join Date: Mar 2003
Rookie Year: 2002
Location: Hauppauge, Long Island, NY
Posts: 8,830
Mark McLeod has a reputation beyond reputeMark McLeod has a reputation beyond reputeMark McLeod has a reputation beyond reputeMark McLeod has a reputation beyond reputeMark McLeod has a reputation beyond reputeMark McLeod has a reputation beyond reputeMark McLeod has a reputation beyond reputeMark McLeod has a reputation beyond reputeMark McLeod has a reputation beyond reputeMark McLeod has a reputation beyond reputeMark McLeod has a reputation beyond repute
Re: CAN wiring question

It actually is setup like that.
The CAN bus is continuous straight through the devices, with each of the devices tapping into the lines as they pass through.

For instance, if we remove power from one Jaguar in the middle of the chain, the rest of the chain still operates.

The stubs are very short as a result.
__________________
"Rationality is our distinguishing characteristic - it's what sets us apart from the beasts." - Aristotle
Reply With Quote
  #3   Spotlight this post!  
Unread 30-09-2014, 09:22
Jon Stratis's Avatar
Jon Stratis Jon Stratis is offline
Electrical/Programming Mentor
FRC #2177 (The Robettes)
Team Role: Mentor
 
Join Date: Feb 2007
Rookie Year: 2006
Location: Minnesota
Posts: 3,791
Jon Stratis has a reputation beyond reputeJon Stratis has a reputation beyond reputeJon Stratis has a reputation beyond reputeJon Stratis has a reputation beyond reputeJon Stratis has a reputation beyond reputeJon Stratis has a reputation beyond reputeJon Stratis has a reputation beyond reputeJon Stratis has a reputation beyond reputeJon Stratis has a reputation beyond reputeJon Stratis has a reputation beyond reputeJon Stratis has a reputation beyond repute
Re: CAN wiring question

All of our CAN devices have a straight pass-through from one port to another - a direct electrical connection with nothing in between. The pass through helps to encourage proper design while keeping the spurs (the lines from the bus to the device) as short as possible. The picture you posted is how things work with our CAN bus from an electrical perspective... the "series" configuration just makes wiring a little easier.
__________________
2007 - Present: Mentor, 2177 The Robettes
LRI: North Star 2012-2016; Lake Superior 2013-2014; MN State Tournament 2013-2014, 2016; Galileo 2016; Iowa 2017
2015: North Star Regional Volunteer of the Year
2016: Lake Superior WFFA
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 05:31.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi