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Chat Area => General Car Chat => Topic started by: 05omegav6 on 06 May 2014, 14:24:26

Title: Canbus speed pulse question...
Post by: 05omegav6 on 06 May 2014, 14:24:26
I have a canbus speed output interface box fitted to the Insignia.

As I understand it, this translates the can signal into 1000pulses per mile.

If I fit this unit into another canbus car, will the meter then need calibrating, or will it still generate 1000 pulses per mile based on the can signal? Car is an E220cdi if that matters :-\

Confuddled of Sussex...
Title: Re: Canbus speed pulse question...
Post by: aaronjb on 06 May 2014, 14:34:33
I'd assume if it's Canbus then it's receiving an absolute speed signal (i.e. "Speed is 32mph") and outputting 32000 pulses over a mile.. i.e. it's turning new-style speed signal into old-style?

I don't know for sure, but I do know if that E220 is an estate I'd be very interested in a shuftie around it ;)
Title: Re: Canbus speed pulse question...
Post by: 05omegav6 on 06 May 2014, 15:10:24
I'd assume if it's Canbus then it's receiving an absolute speed signal (i.e. "Speed is 32mph") and outputting 32000 pulses over a mile.. i.e. it's turning new-style speed signal into old-style?

I don't know for sure, but I do know if that E220 is an estate I'd be very interested in a shuftie around it ;)
Could be... on both counts :-X

Canbus is way above my pay grade, but yes your first paragraph is my take on how it works... if it doesn't need calibrating then that would be one less thing to deal with on thursday :-\
Title: Re: Canbus speed pulse question...
Post by: Marks DTM Calib on 06 May 2014, 16:30:13
Can is a packet like network so as already stated, an absolute speed value is sent.

So in theory it should work......the theory being that Merc have stuck to the standard protocol........
Title: Re: Canbus speed pulse question...
Post by: 05omegav6 on 06 May 2014, 18:15:40
Can is a packet like network so as already stated, an absolute speed value is sent.

So in theory it should work......the theory being that Merc have stuck to the standard protocol........
On liberating the wiring from the Insignia diagnostic port, I discovered that it was connected to pins 1 and 4, not 6 and 14 as suggested :-\ what are pins 1 and 4 for so that I stand half a achance of connecting to the correct pins on the diagnostic socket on the E class...

Have done a route with the insignia prior to removal, so will be clear if it has worked as intended or not :y
Title: Re: Canbus speed pulse question...
Post by: henryd on 06 May 2014, 18:32:56
Can is a packet like network so as already stated, an absolute speed value is sent.

So in theory it should work......the theory being that Merc have stuck to the standard protocol........
On liberating the wiring from the Insignia diagnostic port, I discovered that it was connected to pins 1 and 4, not 6 and 14 as suggested :-\ what are pins 1 and 4 for so that I stand half a achance of connecting to the correct pins on the diagnostic socket on the E class...

Have done a route with the insignia prior to removal, so will be clear if it has worked as intended or not :y

If its the standard 16 pin diagnostic socket both cars should be wired the same  ???

Maybe not ???

this any help   http://plxdevices.com/obd/
Title: Re: Canbus speed pulse question...
Post by: TheBoy on 07 May 2014, 19:28:01
Can is a packet like network so as already stated, an absolute speed value is sent.

So in theory it should work......the theory being that Merc have stuck to the standard protocol........
and the Insignia for that matter....