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CAN Bus wiring

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trigo(at)mail.telepac.pt
Guest

Posted: Fri Apr 15, 2016 9:06 am Post subject: CAN Bus wiring

In the installation of a Garmin G3X system, to interconnect the various components you have to build a network called CAN Bus, similar to the system created by BOSCH for the automotive industry.

 

I cannot find, in the Garmin installation manual, how to physically build this network.

In some interconnect drawings (for example to connect the autopilot servos) they show the CAN wires going in and out of the connectors, therefore in this case I suppose I have to crimp 2 wires in the same pin.

But in other drawings ( to connect to the AHARS or the Displays) they show a node connection, which I am wondering how to make it.

 

So, can anyone who knows how to do it, or already did it, please explain how do I physically connect the 2-wires shielded cables to obtain a correctly built CAN bus backbone.

 

Best

Carlos  

 

 

 

 

 

 

  	        		Sem vÃrus. www.avast.com

gilles.thesee(at)free.fr
Guest

Posted: Fri Apr 15, 2016 9:39 am Post subject: CAN Bus wiring

Le 15/04/2016 19:04, Carlos Trigo a       Ã©critÂ :

     

      	  Quote: 	
		                         <![endif]-->   <![endif]-->       

         

But in other drawings ( to connect to the AHARS             or the Displays) they show a node connection, which I am             wondering how to make it.       

     	
     

     Hi Carlos,

     How about some SubD connectors ?

     https://en.wikipedia.org/wiki/CAN_bus

     

     FWIW

     

     -- 

       Best regards,

       Gilles

       http://contrails.free.fr

       http://lapierre.skunkworks.free.fr

enginerdy(at)gmail.com
Guest

Posted: Fri Apr 15, 2016 9:56 am Post subject: CAN Bus wiring

You can get really fancy and try to fab up some kind of tap-off connector, but generally you just need to make sure the stub length of the tap wires is relatively small (ie just a few inches or less)

Considering that CANBus requires termination, Iâ€™m surprised they donâ€™t give very specific guidance on how to install it.

 	  Quote: 	
		  On Apr 15, 2016, at 12:34 PM, GTH <gilles.thesee(at)free.fr (gilles.thesee(at)free.fr)> wrote:

Le 15/04/2016 19:04, Carlos Trigo a Ã©crit :

 	  Quote: 	
		  But in other drawings ( to connect to the AHARS or the Displays) they show a node connection, which I am wondering how to make it.



	
Hi Carlos,How about some SubD connectors ?https://en.wikipedia.org/wiki/CAN_busFWIW-- Best regards,Gilleshttp://contrails.free.frhttp://lapierre.skunkworks.free.fr

ceengland7(at)gmail.com
Guest

Posted: Fri Apr 15, 2016 10:01 am Post subject: CAN Bus wiring

On 4/15/2016 12:04 PM, Carlos Trigo       wrote:

     

      	  Quote: 	
		                         <![endif]-->   <![endif]-->                

In the installation of a Garmin G3X system, to             interconnect the various components you have to build a             network called CAN Bus, similar to the system created by             BOSCH for the automotive industry.         

Â          

I cannot find, in the Garmin installation             manual, how to physically build this network.         

In some interconnect drawings (for example to             connect the autopilot servos) they show the CAN wires going             in and out of the connectors, therefore in this case I             suppose I have to crimp 2 wires in the same pin.         

But in other drawings ( to connect to the AHARS             or the Displays) they show a node connection, which I am             wondering how to make it.         

Â          

So, can anyone who knows how to do it, or             already did it, please explain how do I physically connect             the 2-wires shielded cables to obtain a correctly built CAN             bus backbone.         

Â          

Best         

CarlosÂ         

     	
     Carlos, 

     

     I've never needed to know a lot about CAN bus architecture, but my     gut reaction is that since it's stone cold reliable in cars, so it's     probably neither expensive or difficult to implement. 

     

     https://en.wikipedia.org/wiki/CAN_bus

     

     Above says that it's wiring architecture-agnostic (can be bus, star     or mix of both). I did a little reading & it seems that unless     you're in a very high electrical noise environment, shielding     probably isn't even needed. Twisted pairs and termination resistors     are recommended, however. If you use a short 'stub' wire out of each     connector, and crimp your two wires onto that stub, you have     created, well, literally, a very short *stub* from the bus backbone     to that node. Note that the drawings on the Wiki page don't depict a     shield. If you do use a shield, you should be able to use the     techniques in 'the book' to keep continuity in the backbone shield     & realize that a 4" (or even a foot long) unshielded stub isn't     going to hurt.

     

     FWIW,

     

     Charlie

matronics(at)rtist.nl
Guest

Posted: Fri Apr 15, 2016 10:25 am Post subject: CAN Bus wiring

Hi Carlos,

       

       CAN bus attaches all systems in parallel on a 2-wire bus. Each       node/system has a CAN-Hi and a CAN-Lo pin. As you already found,       each pin has two wires in the same pin, one coming from the       previous node and one going to the next node. The first and the       last node on the string have a terminating resistor that you can       place externally onto the cable, or when the node offers one       internally, by adding a jumper inside the last connector.

       

       Not sure which AHRS drawings you are looking at, but some nodes       offer other bus connections like RS-232 or RS-485. Is that what       confused you?

       

       Rob

       

       

       On 4/15/2016 7:04 PM, Carlos Trigo wrote:

     

      	  Quote: 	
		                         <![endif]-->   <![endif]-->                

In the installation of a Garmin G3X system, to             interconnect the various components you have to build a             network called CAN Bus, similar to the system created by             BOSCH for the automotive industry.         

Â          

I cannot find, in the Garmin installation             manual, how to physically build this network.         

In some interconnect drawings (for example to             connect the autopilot servos) they show the CAN wires going             in and out of the connectors, therefore in this case I             suppose I have to crimp 2 wires in the same pin.         

But in other drawings ( to connect to the AHARS             or the Displays) they show a node connection, which I am             wondering how to make it.         

Â          

So, can anyone who knows how to do it, or             already did it, please explain how do I physically connect             the 2-wires shielded cables to obtain a correctly built CAN             bus backbone.         

Â          

Best         

CarlosÂ           

Â          

Â          

Â          

Â          

Â          

Â        

       

                                                     Sem vÃrus. www.avast.com

trigo(at)mail.telepac.pt
Guest

Posted: Fri Apr 15, 2016 11:03 am Post subject: CAN Bus wiring

Hi Rob

 

I did understand that the CAN bus attaches all items in parallel on a 2-wire cable.

I also understood that there are terminators to be put in the first and last nodes.

My problem is with the intermediate nodes! 

 

In the case of the servos (please see the 1st Â attached pdf), I suppose that I will have to crimp 2 wires (in and out) in the same pin, thus making the continuity.

 

But in the case of connecting the GSU 25 (AHARS) with the Display units (GDU 46X/37X) - please see the 2nd attached pdf, in which the CAN bus is connected thru nodes inserted in the middle of the 2-wire cable - thatâ€™s where I donâ€™t know how to physically make those connections.

Should I strip a small length of the each wire and make a pigtail with a solder sleeve?

 

Thanks

CarlosÂ  

 

 

 

 



 

From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Rob Turk

Sent: sexta-feira, 15 de Abril de 2016 19:22

To: aeroelectric-list(at)matronics.com

Subject: Re: CAN Bus wiring

 

Hi Carlos,



CAN bus attaches all systems in parallel on a 2-wire bus. Each node/system has a CAN-Hi and a CAN-Lo pin. As you already found, each pin has two wires in the same pin, one coming from the previous node and one going to the next node. The first and the last node on the string have a terminating resistor that you can place externally onto the cable, or when the node offers one internally, by adding a jumper inside the last connector.



Not sure which AHRS drawings you are looking at, but some nodes offer other bus connections like RS-232 or RS-485. Is that what confused you?



Rob

On 4/15/2016 7:04 PM, Carlos Trigo wrote:

 	  Quote: 	
		  

In the installation of a Garmin G3X system, to interconnect the various components you have to build a network called CAN Bus, similar to the system created by BOSCH for the automotive industry.

 

I cannot find, in the Garmin installation manual, how to physically build this network.

In some interconnect drawings (for example to connect the autopilot servos) they show the CAN wires going in and out of the connectors, therefore in this case I suppose I have to crimp 2 wires in the same pin.

But in other drawings ( to connect to the AHARS or the Displays) they show a node connection, which I am wondering how to make it.

 

So, can anyone who knows how to do it, or already did it, please explain how do I physically connect the 2-wires shielded cables to obtain a correctly built CAN bus backbone.

 

Best

Carlos  

 

 

 

 

 

 

 



Sem vÃrus. www.avast.com 	


 

  	        		Sem vÃrus. www.avast.com

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rick(at)beebe.org
Guest

Posted: Fri Apr 15, 2016 11:24 am Post subject: CAN Bus wiring

You can wire it the same as the servos. For example, Pin 46 of the     2nd GDU would have a wire from pin 46 of the first GDU and a second     wire heading either to the 3rd GDU or to pin 1 of the GSU. It's     functionally the same as using little stub wires.

     

     --Rick

     

     On 04/15/2016 02:59 PM, Carlos Trigo       wrote:

     

      	  Quote: 	
		                       v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} <![endif]-->         <![endif]-->   <![endif]-->                

Hi             Rob         

Â          

I did understand that the CAN bus attaches all             items in parallel on a 2-wire cable.         

I also understood that there are terminators to             be put in the first and last nodes.         

My problem is with the intermediate nodes!          

Â          

In the case of the servos (please see the 1st             Â attached pdf), I suppose that I will have to crimp 2             wires (in and out) in the same pin, thus making the             continuity.         

Â          

But in the case of connecting the GSU 25             (AHARS) with the Display units (GDU 46X/37X) - please see             the 2nd attached pdf, in which the CAN bus is             connected thru nodes inserted in the middle of the 2-wire             cable - thatâ€™s where I donâ€™t know how to physically make             those connections.         

Should I strip a small length of the each wire             and make a pigtail with a solder sleeve?         

Â          

Thanks         

CarlosÂ           

Â          

Â                     

Â            

Â          

         

Â                                  

From:                 owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)                 [mailto:owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)] On                   Behalf Of Rob Turk

                 Sent: sexta-feira, 15 de Abril de 2016 19:22

                 To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)

                 Subject: Re: CAN Bus wiring           

         

         

Â                     

Hi Carlos,

             

             CAN bus attaches all systems in parallel on a 2-wire bus.             Each node/system has a CAN-Hi and a CAN-Lo pin. As you             already found, each pin has two wires in the same pin, one             coming from the previous node and one going to the next             node. The first and the last node on the string have a             terminating resistor that you can place externally onto the             cable, or when the node offers one internally, by adding a             jumper inside the last connector.

             

             Not sure which AHRS drawings you are looking at, but some             nodes offer other bus connections like RS-232 or RS-485. Is             that what confused you?

             

             Rob

             

             

             On 4/15/2016 7:04 PM, Carlos Trigo wrote:         

          	  Quote: 	
		             

In the installation of a Garmin G3X system,               to interconnect the various components you have to build a               network called CAN Bus, similar to the system created by               BOSCH for the automotive industry.           

Â            

I cannot find, in the Garmin installation               manual, how to physically build this network.           

In some interconnect drawings (for example to               connect the autopilot servos) they show the CAN wires               going in and out of the connectors, therefore in this case               I suppose I have to crimp 2 wires in the same pin.           

But in other drawings ( to connect to the               AHARS or the Displays) they show a node connection, which               I am wondering how to make it.           

Â            

So, can anyone who knows how to do it, or               already did it, please explain how do I physically connect               the 2-wires shielded cables to obtain a correctly built               CAN bus backbone.           

Â            

Best           

CarlosÂ             

Â            

Â            

Â            

Â            

Â            

Â            

Â                                                                            

                                                     

Sem                       vÃrus. www.avast.com                                                                  	
         

Â        

       

                                                     Sem vÃrus. www.avast.com

clr(at)redingaviation.com
Guest

Posted: Fri Apr 15, 2016 11:47 am Post subject: CAN Bus wiring

Carlos

Don't know if you have seen some of the YouTube videos by SteinAir. He has some great videos on using solder sleeves and making up terminals. 

I just finished wiring up my panel which is a G3x system using the info from Steins videos and the cartoons from Bob on splicing two wires together at a pin. 

Keep your can bus runs as short as possible if you are not using shielded wires and make sure that you use the termination at the end of the run and you should be fine

Craig



On Apr 15, 2016, at 14:22, Rob Turk <matronics(at)rtist.nl (matronics(at)rtist.nl)> wrote:

 	  Quote: 	
		                     Hi Carlos,

       

       CAN bus attaches all systems in parallel on a 2-wire bus. Each       node/system has a CAN-Hi and a CAN-Lo pin. As you already found,       each pin has two wires in the same pin, one coming from the       previous node and one going to the next node. The first and the       last node on the string have a terminating resistor that you can       place externally onto the cable, or when the node offers one       internally, by adding a jumper inside the last connector.

       

       Not sure which AHRS drawings you are looking at, but some nodes       offer other bus connections like RS-232 or RS-485. Is that what       confused you?

       

       Rob

       

       

       On 4/15/2016 7:04 PM, Carlos Trigo wrote:

     

      	  Quote: 	
		                         <![endif]-->   <![endif]-->                

In the installation of a Garmin G3X system, to             interconnect the various components you have to build a             network called CAN Bus, similar to the system created by             BOSCH for the automotive industry.         

          

I cannot find, in the Garmin installation             manual, how to physically build this network.         

In some interconnect drawings (for example to             connect the autopilot servos) they show the CAN wires going             in and out of the connectors, therefore in this case I             suppose I have to crimp 2 wires in the same pin.         

But in other drawings ( to connect to the AHARS             or the Displays) they show a node connection, which I am             wondering how to make it.         

          

So, can anyone who knows how to do it, or             already did it, please explain how do I physically connect             the 2-wires shielded cables to obtain a correctly built CAN             bus backbone.         

          

Best         

Carlos           

          

          

          

          

          

        

       

                                                     Sem vÃrus. [/url][url=http://www.avast.com]www.avast.com

matronics(at)rtist.nl
Guest

Posted: Fri Apr 15, 2016 11:52 am Post subject: CAN Bus wiring

Hi Carlos,

       

       On the second drawing you can use the same method of putting two       wires in a single pin, this will be a valid CAN bus connection.       That is the 'clean' option.

       

       However, this is a big connector with lots of tightly spaced pins.       Fitting two wires in each pin and connecting the shields may be a       bit difficult inside the connector cap. Therefor you can also use       the alternative of two small pieces of wire (a stub) and splice       the CAN bus to attach those two wires. It is equally valid for CAN       bus, as long as you keep the stub short (5 - 10 cm or so). Not as       clean but equally valid.

       

       Rob

       

       

       On 4/15/2016 8:59 PM, Carlos Trigo wrote:

     

      	  Quote: 	
		                       v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} <![endif]-->         <![endif]-->   <![endif]-->                

Hi             Rob         

Â          

I did understand that the CAN bus attaches all             items in parallel on a 2-wire cable.         

I also understood that there are terminators to             be put in the first and last nodes.         

My problem is with the intermediate nodes!          

Â          

In the case of the servos (please see the 1st             Â attached pdf), I suppose that I will have to crimp 2             wires (in and out) in the same pin, thus making the             continuity.         

Â          

But in the case of connecting the GSU 25             (AHARS) with the Display units (GDU 46X/37X) - please see             the 2nd attached pdf, in which the CAN bus is             connected thru nodes inserted in the middle of the 2-wire             cable - thatâ€™s where I donâ€™t know how to physically make             those connections.         

Should I strip a small length of the each wire             and make a pigtail with a solder sleeve?         

Â          

Thanks         

CarlosÂ           

Â          

Â                     

Â            

Â          

         

Â                                  

From:                 owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)                 [mailto:owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)] On                   Behalf Of Rob Turk

                 Sent: sexta-feira, 15 de Abril de 2016 19:22

                 To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)

                 Subject: Re: CAN Bus wiring           

         

         

Â                     

Hi Carlos,

             

             CAN bus attaches all systems in parallel on a 2-wire bus.             Each node/system has a CAN-Hi and a CAN-Lo pin. As you             already found, each pin has two wires in the same pin, one             coming from the previous node and one going to the next             node. The first and the last node on the string have a             terminating resistor that you can place externally onto the             cable, or when the node offers one internally, by adding a             jumper inside the last connector.

             

             Not sure which AHRS drawings you are looking at, but some             nodes offer other bus connections like RS-232 or RS-485. Is             that what confused you?

             

             Rob

             

             

             On 4/15/2016 7:04 PM, Carlos Trigo wrote:         

          	  Quote: 	
		             

In the installation of a Garmin G3X system,               to interconnect the various components you have to build a               network called CAN Bus, similar to the system created by               BOSCH for the automotive industry.           

Â            

I cannot find, in the Garmin installation               manual, how to physically build this network.           

In some interconnect drawings (for example to               connect the autopilot servos) they show the CAN wires               going in and out of the connectors, therefore in this case               I suppose I have to crimp 2 wires in the same pin.           

But in other drawings ( to connect to the               AHARS or the Displays) they show a node connection, which               I am wondering how to make it.           

Â            

So, can anyone who knows how to do it, or               already did it, please explain how do I physically connect               the 2-wires shielded cables to obtain a correctly built               CAN bus backbone.           

Â            

Best           

CarlosÂ             

Â            

Â            

Â            

Â            

Â            

Â            

Â                                                                            

                                                     

Sem                       vÃrus. www.avast.com                                                                  	
         

Â        

       

                                                     Sem vÃrus. www.avast.com

ceengland7(at)gmail.com
Guest

Posted: Fri Apr 15, 2016 12:16 pm Post subject: CAN Bus wiring

Quick & dirty pic of what I mentioned earlier as a 'stub'. Ignore colors; I just grabbed what was convenient to get the pic.Â 

Crimp or solder the 'stub' in one end of a butt splice (yellow in pic); apply your required pin to the other end. Cut into the bus backbone, and snip one of the wires in the pair. Insert *both* of the clipped wire ends into the other end of the butt splice.Â 

Repeat for the other wire in the pair.

Assuming you've kept the shield on the backbone, if you can cut into the cable without actually cutting the shield (yes, it can almost always be done), then tape it up & you're done. If not, or you want a cleaner look, manage the shield as shown in Bob's book, with insulated stubs on each shield with a butt splice on the shield stubs. The shield does not need to enter the node's connector.

Charlie

20160415_150157_resized.jpg

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trigo(at)mail.telepac.pt
Guest

Posted: Fri Apr 15, 2016 4:08 pm Post subject: CAN Bus wiring

Thank you Charlie

and Rob, Craig and Rick



Now I have a bunch of solutions to my problem.



Cheers

Carlos



Enviado do meu iPhone



No dia 15/04/2016, Ã s 21:12, Charlie England <ceengland7(at)gmail.com> escreveu:



 	  Quote: 	
		   Quick & dirty pic of what I mentioned earlier as a 'stub'. Ignore colors; I just grabbed what was convenient to get the pic. 

 Crimp or solder the 'stub' in one end of a butt splice (yellow in pic); apply your required pin to the other end. Cut into the bus backbone, and snip one of the wires in the pair. Insert *both* of the clipped wire ends into the other end of the butt splice. 

 Repeat for the other wire in the pair.

 

 Assuming you've kept the shield on the backbone, if you can cut into the cable without actually cutting the shield (yes, it can almost always be done), then tape it up & you're done. If not, or you want a cleaner look, manage the shield as shown in Bob's book, with insulated stubs on each shield with a butt splice on the shield stubs. The shield does not need to enter the node's connector.

 

 Charlie

 <20160415_150157_resized.jpg>

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