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Serial bus S1 keeps displaying on 3000X and LED doesn't light

Question asked by mr.crc on Mar 26, 2014
Latest reply on Apr 15, 2014 by bret

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Hi:

On a DSO/MSO-X 3024A/3034A if I press "Serial" then turn on the "serial 1" (S1) bus display, then turn it back off again, the next time I power the scope, the S1 bus display is back! Even if I turn S1 off, turn S2 on, power cycle, S1 is back! There seems to be no way to get rid of it.

Do you experience this same bug?

After some convoluted sequence of turning serial busses on/off, and power cycling, I've managed to get S1 to disappear without a factory reset. Maybe it will return next time?

Also, the "Serial" button LED doesn't light up when a serial bus is displayed.

Clearly there are some bugs here. I would expect that this has been well known, and is promised to be fixed in the next firmware, right?

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algoss Mar 27, 2014 4:30 AM
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You should call your local Technical Call Center and talk about this with them. This is not the correct venue for reporting bugs. The forums are intended for peer-to-peer conversations and are not consistently monitored by Agilent personnel.

Al
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ksmith Mar 27, 2014 7:58 AM
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My scope does that too. Looks like a bug. I'll get it reported.

as for the Serial LED, it's NOT supposed to come on. Ever. The triangular LEDs is an indicator of what feature will be controlled by the feature knobs on the right side of the scope. Notice that there are no serial features that use this knob, so the light will never come on. It’s not very intuitive, but the intention is not to show on/off but knob control.
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- mr.crc @ ksmith on Mar 27, 2014 10:41 PM
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  At first this made no sense. Now I get it. The LED tells you which feature the knobs work on. Yes. It's not an indicator of which feature is turned on.
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davidbottorff Mar 27, 2014 3:43 PM
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Good afternoon,

     If you enter SERIAL mode and turn the scope off, the scope will remember that you were in SERIAL mode when you turn it back on. The same is true for DIGITAL and REFERENCE modes. You can easily return the scope to 'normal' mode by pressing the Default Setup button.

     The reason that the SERIAL LED does not illuminate is because the is no SERIAL LED. The LED indicates that the vertical and movement controls in that section can influence the mode you have selected. You cannot move or change the serial bus locations using the vertical and movement controls.

     I hope this helps.

Take care,

-David
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- mr.crc @ davidbottorff on Mar 27, 2014 10:45 PM
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  David, there actually is a serial LED. It lights during the POST. However, I understand that it should not light when using the serial bus display.
  
  However, you misunderstood my post. What I said was that if you turn OFF serial display, then when you turn the scope back on, the serial display will be turned back on. The scope remembers the wrong thing. It should remember that serial was OFF. This is clearly a bug. It will continue to power up with the serial bus display even after multiple attempts to turn it off.
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  - bret @ mr.crc on Apr 1, 2014 7:38 PM
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davidbottorff Apr 7, 2014 3:55 PM
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Hi Mr. CRC,

     On my MSO-X 3024A, running firmware revision 2.35, I see somewhat different behavior than you described. I set the scope up to decode RS232 signals on channels 1 and 2, including triggering, then turned the scope off. When I powered the scope back up, it was decoding the RS232 signals again. I then turned off serial mode which turned off the serial decoder on the bottom of the screen. When I power cycled the scope again, the scope came back up without the serial decoder showing. However, all of the serial decoding settings persisted including the triggers previously set. The scope does remember the last settings used. When I want the scope to start fresh, I press the Default Settings button - that clears all of the scope's signal and function settings. When power cycled again the scope will come up in default condition.

     Please check the firmware on your scope by pressing Help and About Scope. If your scope is running a version before 2.35, please apply the latest firmware from the Agilent web site. If you still see the behavior you described after updating, please contact Agilent support.

     Take care,

David
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bret Apr 15, 2014 8:02 AM
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The oscilloscope does save most of the important settings over a power-cycle, but do note that it takes about 2 seconds of idle-time from your last interaction with the instrument for the settings to be saved.

Having said that, the S1 behavior that your are seeing is an exception as it is a bug (I see it too). S2 behavior works as expected.

Like what the others have replied, either:
- log a case with Agilent Support to get it fixed, or
- hope the developers see this and fix it in the next release

In either case, it's doesn't seem like a big issue. If you don't want it to turn on when powering up, just turn off Serial Decode entirely, wait a few seconds, then power-down.
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Serial bus S1 keeps displaying on 3000X and LED doesn't light

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