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REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol
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Teneyes:
FW 00.03.00.01.03 , Still No SCPI command access to 'CAN' protocol
See Display for:
  The SCPI command to set the trigger mode to 'SPI'
  The SCPI command to query  the current trigger mode 

  The SCPI command to set the trigger mode to 'CAN'
  The SCPI command to query  the current trigger mode 
 
  The DS2000 was manually set to 'CAN'

  The SCPI command to query  the current trigger mode 
 
  The SCPI command to set the trigger mode to 'USB'
  The SCPI command to query  the current trigger mode 
 
Teneyes:
Multiple Bursts of 'CAN' messages with short duration between Bursts (75us burst period)

Multiple Bursts of 'CAN' messages with ERROR of missed Frames as the duration between Bursts is too Short.(102us burst period)

I'm not sure what the "Interframe space consists of at least three consecutive recessive (1) bits" spec.
in 'CAN' protocol means. ??
SPEC

Well I'm learning 'CAN' Frame Format and is shown in  #3 Pic

#4 shows the minimum time before next Burst will be decoded =  about 3 Bit periods

zibadun:

--- Quote from: Fagear on April 28, 2014, 07:09:28 pm ---Don't know if it will be helpful... But while Dave still is waiting for stable FW to do his DS2000 review ;) I've shot my own video.
Why it can be not helpfull? Well, it is not on English. :blah:
Maybe I will do some captions on English later. Don't know yet.

--- End quote ---

??????, ???????? ????????????? ?????. ???????, ???????! 

???????

update: ok. the 'not English' font did not work  :-[.  Maksim, great informative video. Thanks, good luck!
Mark_O:

--- Quote from: Teneyes on April 30, 2014, 02:46:22 am ---I'm not sure what the "Interframe space consists of at least three consecutive recessive (1) bits" spec.
in 'CAN' protocol means. ??

--- End quote ---

After the End of Frame field, there must be a minimum of 3 Recessive bits for the IFS field.  Of course, in Bus Idle, there can be any number of recessive bits for inter-frame space after that.  But 3 is the minimum, before another Dominant bit can trigger the next SOF.

EDIT:  I'm disappointed to see that they've failed to implement SCPI support for CAN.  That's pretty bogus.
Mark_O:

--- Quote from: Teneyes on April 30, 2014, 02:46:22 am ---#4 shows the minimum time before next Burst will be decoded =  about 14 Bit periods

--- End quote ---

If 14 bit periods are required, as you've indicated, then that means it can not successfully decode back-to-back CAN packets, which I deal with all the time.  I.e., no value as a diagnostic tool. 

EDIT:  OK, I think I see (most of) the problem.  You're counting the minimum interval before the next burst, starting after the ACK slot, right?  There are 11 bits after that which are still part of the CAN frame: ACK delim(1), EOF(7), IFS(3).  Which must all be recessive, so it just looks like dead space.  That accounts for 11 of the 14 bits you indicated.
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