K-Line

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K-Line

Postby Marvil » Mon Jun 08, 2015 4:02 pm

Hi,
I recently started to use oscillograph and purchased Picoscope 4425 a few weeks ago.
Same days ago one bus came in with the ABS system fault. I didn't have tehnical manual of this bus, but needed to find K-Line pin to connect my WABCO diagnostic tool to check the ABS system.I started look for signal, but couldn't find the right as it shown in the description about K-Line.
Could somebody tell me what I did wrong why I couldn't see K-Line signal just straight line approximately 21,35V (24 system).
Finally I found the K-Line and connected to WABCO control module.

Thanks in advance.
Marvil
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Re: K-Line

Postby volrem » Tue Jun 09, 2015 11:57 am

I there is no communication present then you will see straight line.
volrem
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Re: K-Line

Postby AWright » Tue Jul 14, 2015 7:11 am

As far as I know, it is normal for the K - Line to have a high voltage e.g 12 volts or 24 volts present. When a diagnostic tester is connected it grounds the K - Line to create a series of highs and lows ( 0,s and 1,s) to allow communication. If you had left the scope connected you would have seen this.
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