SJPB1982
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I don't know if this has been covered already and if it has I could not find it so bring on the p*ss taking. Can anyone tell me what can bus wiring is and what practical difference it makes?
Can bus wiring
- Thread starter SJPB1982
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as i understand it...
in a normal lighting circuit, a switch switches the required current to light the lamp.
with can-bus, the switch switches a low voltage to a computer, which then switches the required current to light the lamp.
if there's massive amounts of cables in long runs, using can-bus can dramatically reduce the amount of wires running front to back, and thus weight/complexity of manufacture/cost.
i really don't see how this helps on a motorcycle though TBH, maybe on a supertanker?
there appears to be just as much wiring on a 1200 as an 1150
oh, and...
you don't need fuses, as the computer detects problems, and shuts down the relevant circuits.
if there are other *advantages*, i don't know what they are.
in a normal lighting circuit, a switch switches the required current to light the lamp.
with can-bus, the switch switches a low voltage to a computer, which then switches the required current to light the lamp.
if there's massive amounts of cables in long runs, using can-bus can dramatically reduce the amount of wires running front to back, and thus weight/complexity of manufacture/cost.
i really don't see how this helps on a motorcycle though TBH, maybe on a supertanker?
there appears to be just as much wiring on a 1200 as an 1150
oh, and...
you don't need fuses, as the computer detects problems, and shuts down the relevant circuits.
if there are other *advantages*, i don't know what they are.
Yep the Can bus is much lighter and uses much less cabling than an 1150 About the only advantage I perceive of a 1200
Each item is control thru the central electrical unit so the unit sees a switch open or close and send volts to the appropriate Network "address" which is linked to that switch, i.e. could be an indicator (pair) or a headlamp etc etc I think the brake lamp switches are thru the ABS system which is an independent circuit as are the clocks and the ESA
Getting too complicated Too few old hands to teach the Whippersnappers wot is wot!
Each item is control thru the central electrical unit so the unit sees a switch open or close and send volts to the appropriate Network "address" which is linked to that switch, i.e. could be an indicator (pair) or a headlamp etc etc I think the brake lamp switches are thru the ABS system which is an independent circuit as are the clocks and the ESA
Getting too complicated Too few old hands to teach the Whippersnappers wot is wot!
I would add to the above that diagnosis of some faults is easier, since the canbus knows the status of the individual components in an intelligent manner. So with a BMW computer or GS911 it is easier to tell which item has failed and therefore reduce the time taken to find faults via traditional trial and error or time consuming manner.
It does also mean the wiring is lighter and doesn't need to carry higher currents through all the switchgear etc, thereby reducing the requirement for onboard relays etc as well.
I actually quite like the system myself....
It does also mean the wiring is lighter and doesn't need to carry higher currents through all the switchgear etc, thereby reducing the requirement for onboard relays etc as well.
I actually quite like the system myself....
None of the above I'm afraid (I hate clever shytes too)
Its stands for Controller Area Network
It is a pair of wires. It connects the bikes computers together and the protocol is widely established in the instrumentation Field - and is very reliable. It helps reliability in that there are fewer wires and connectors to go wrong.
Its stands for Controller Area Network
It is a pair of wires. It connects the bikes computers together and the protocol is widely established in the instrumentation Field - and is very reliable. It helps reliability in that there are fewer wires and connectors to go wrong.
None of the above I'm afraid (I hate clever shytes too)
Its stands for Controller Area Network
It is a pair of wires. It connects the bikes computers together and the protocol is widely established in the instrumentation Field - and is very reliable. It helps reliability in that there are fewer wires and connectors to go wrong.
So power and signals over same wire pair then? Presumably using a ground return gets a bit more complicated with signals flying about.
Deleted account 190920001
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Top marks to wilbjr21. it has nothing to do with switching anything. Its pure and simply a communication protocol the same as TCP/IP is for computers. It is a means to pass data between different computers on the bike, nothing more and nothing less. You don't plug anything into it so no that socket your GPS is plugged into isn't a CANbus socket, its a power socket.
So what does it mean to you? It means you have fewer cables going to things. Instead of having dozens of cables going to say the instrument pod you only have a few. The pod is a computer and it gets data from all the other computers (BMSK, ZFE, ABS) about what is going on around it then it shows you on the LCD or dials.
Wiring diagram here http://www.r1200gs.info/R1200GS-WD2.pdf where you will see the two wires MR-CAN-L and MR-CAN-H go round all the other computers.
So what does it mean to you? It means you have fewer cables going to things. Instead of having dozens of cables going to say the instrument pod you only have a few. The pod is a computer and it gets data from all the other computers (BMSK, ZFE, ABS) about what is going on around it then it shows you on the LCD or dials.
Wiring diagram here http://www.r1200gs.info/R1200GS-WD2.pdf where you will see the two wires MR-CAN-L and MR-CAN-H go round all the other computers.
Am I not correct in saying that each Control unit "Talks" to each other via networking on a "Bus" system Hence Can Bus
BUT they require inputs via switches Admittedly no relays or fuses because the solid state switching sorts that out and it also means that a only pair or 3 wires run to a switch or a bulb to and from the ZFE which does all the business and feeds info to clocks and ABS unit etc etc
BUT they require inputs via switches Admittedly no relays or fuses because the solid state switching sorts that out and it also means that a only pair or 3 wires run to a switch or a bulb to and from the ZFE which does all the business and feeds info to clocks and ABS unit etc etc
Deleted account 190920001
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Yes the controllers still need switches but it has nothing to do with the CANbus. Your handle bar switches are connected to the ZFE unit for example. You press the high beam button the ZFE unit sees it and you get high beam. That part is kinda like the old switch and relay only its a transistor instead of a relay. In this instance where CAN comes in is that data is transmitted over it and your instruments pick this up and turns the high beam indicator on. so The ZFE unit transmits "hey everyone I have put high beam on" and the clocks sees this and puts the high bean indicator on. Not a good example but imagine there was a program in the engine management that said limit speed to 60mph when the high beam is on. So now the ZFE unit says "hey everyone I have put high beam on" the clocks say ok I am putting the blue light on and the engine management says ok I better stop this tosser killing himself so I am limiting speed. All over the same two wires and with one message.
Another example in the car world could be the ECU sends out your spead over the CAN so your speedo shows you this. Your radio also sees this and turns the volume up and if your posh your soft top wont work because your going over 30. One transmission, two wires and its all done.
Get the idea?
Another example in the car world could be the ECU sends out your spead over the CAN so your speedo shows you this. Your radio also sees this and turns the volume up and if your posh your soft top wont work because your going over 30. One transmission, two wires and its all done.
Get the idea?
A real pity that the same two wires can't say "Hey, I'm the Fuel Pump Controller and I'm a bit fecked, can you put a warning in the display to warn the rider as they need to call recovery".
Deleted account 190920001
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LOL, I thought it did tell you. The bike stops and you call recovery?
NLC
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Good overview. Thanks for sharing. I added a fuzebox that all of my farckles are wired into which makes adding stuff easier and it has fuses!
Deleted account 190920001
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Bah! fuses are over rated and just blow all the time. Anyway as per above fuses/circuit breakers have nothing to do with CAN but is a function of the ZFE. You still arent getting it are you lol.
NLC
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I'm old school 
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