Re: Can -- Sampling time point of -- 87.5%

Thanks .. got the point .. best is to use some calculator to reduce
workload.

//John

On Wed, Dec 5, 2012 at 1:01 PM, John Dammeyer <[email protected]>wrote:

> **
> John,
>
> I'm sorry I can't help you.  I really don't understand what you are asking
> for.  There are numerous calculators out there for CAN bus sampling points
> and bus lengths. The sample point is chosen as an optimal point where the
> signal is still 'healthy' on a given bus.  Choose cable with the wrong
> impedance, choose to operate at the maximum length for a specific bit rate,
> choose cable with a high capacitance, choose drivers that are non-optimal
> for CAN, use opto-isolators between the CAN device and the driver... all
> those affect what sample point you choose.
>
> As I understood your question you wanted to know how to get an 87.5%
> sample point. The answer was simple.  Sample at T_SEG 14 when there are
> 16 T_SEG per bit.
>
> It's a standard GIGO (from the 1970's  -- Garbage In, Garbage Out).
> There's no such thing as a dumb question but you do have to ask
> specifically what you want or you will get either nothing or answers that
> don't make any sense.
>
> John Dammeyer
>
>
>
> *"ELS! The Solution"
> *Automation Artisans Inc.
> http://www.autoartisans.com/ELS/
> Ph. 1 250 544 4950
>
>  -----Original Message-----
> *From:* [email protected] [mailto:
> [email protected]] *On Behalf Of *John cliffer
> *Sent:* Tuesday, December 04, 2012 11:20 PM
> *To:* CANLIST
> *Subject:* [CANLIST] Can -- Sampling time point of -- 87.5%
>
> >> It's simple math really.
>
> That is fine john which everyone knows .... means we have to repeatedly
> perform the calculation given in AN1798 doc to decide which fits best for
> your sample point.
>
> And when adjusting timings of segment to achieve our sample point. This
> may led to reduce in maximum length of cable use between farthest node on
> BUS.
>
> //John
>
>
>
> On Wed, Dec 5, 2012 at 12:24 PM, John Dammeyer <[email protected]>wrote:
>
>> It's simple math really.
>
>
>
>