[time-nuts] Tbolt and iCruse readout problem - any ideas?

David Bobbett d.bobbett at tiscali.co.uk
Thu Aug 19 07:22:36 UTC 2010


  Hi Brooke,

I know what you are thinking! Sadly the supply is 12.1v so there's 
plenty of regulator headroom, very interesting page though.  I'm 
beginning to think that Didier's suggestion of corrupted firmware in the 
iCruse is the most probable explanation.

Best wishes,

David



On 18/08/2010 16:58, Brooke Clarke wrote:
> Hi David:
>
> What power supply voltage are you using?
> http://www.prc68.com/I/ThunderBolt.shtml#iCruze
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
>
>
> David Bobbett wrote:
>>  Hi Didier,
>>
>> No - the display reads "DAC V: 0.0000" on the iCruse LCD, all the 
>> other data (including temperature) displays normally and correctly. 
>> So it is only that part of the data which doesn't seem to be decoded 
>> and displayed correctly. The really odd thing is that the DAC V value 
>> can be seen in Tboltmon.exe, although I realise that that particular 
>> program also sends data to the Tbolt, which the iCruse does not.
>>
>> The reference to the RS232 resistors was in the context of the 
>> discussions regarding whether the values in the iCruse are correct -  
>> but of course if all the other data is being received correctly, 
>> there doesn't seem to be any logical reason why the DAC data would be 
>> any different.
>>
>>
>> Thanks for the reply, but I'm still puzzled!
>>
>>
>> David, G4IRQ
>>
>>
>>
>>
>>
>> On 18/08/2010 12:33, Didier Juges wrote:
>>> When you say "will not display the DAC V value", do you mean the 
>>> display is
>>> blank, or it displays garbage?
>>>
>>> Interestingly, the code that displays temperature and DAC voltage is
>>> essentially the same, the only difference being which part of the data
>>> string received from the Thunderbolt is processed, so it is hard to 
>>> imagine
>>> why one would work and not the other, unless the data received from 
>>> the TB
>>> is corrupted in the part that should contain the DAV value, and the
>>> conversion routine fails.
>>>
>>> If you have doubts that the serial interface may not be working (I 
>>> am not
>>> sure about what missing resistor you are talking about), fix that 
>>> first and
>>> try again.
>>>
>>> Looking at the serial stream with a scope may help diagnose such 
>>> problem.
>>>
>>> Didier KO4BB
>>>
>>> -----Original Message-----
>>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>>> Behalf Of David Bobbett
>>> Sent: Wednesday, August 18, 2010 4:23 AM
>>> To: time-nuts at febo.com
>>> Subject: [time-nuts] Tbolt and iCruse readout problem - any ideas?
>>>
>>>    Hi all,
>>>
>>> Having struggled in vain to solve this problem, I thought I  would 
>>> make a
>>> plea for help as my first posting to Time Nuts . . . so here goes!
>>>
>>> I have a Tbolt with v3.00 firmware which works fine with the 
>>> Tboltmon.exe
>>> V2.60 and Lady Heather software. It also works fine with the iCruse 
>>> Tbolt
>>> LCD monitor - except that the monitor will not display the "DAC V" 
>>> value,
>>> all the other values are displayed without a problem.
>>> The iCruse is the later version which has had the PIC voltage 
>>> conversion
>>> done, but not the RS232 input resistor mods.
>>>
>>>
>>> I have two questions really:
>>>
>>> 1) Is there a setting which I need to change in my Tbolt using 
>>> Tboltmon.exe
>>> to get this to work?
>>>
>>> 2) Does anybody on Time Nuts have an iCruse which shows a negative 
>>> value for
>>> the "DAC V"?
>>>
>>>
>>> As far as I can see, there are 3 options: a) there is a configuration
>>> problem, b) the iCruse doesn't display negative values for DAC V, c) my
>>> iCruse is faulty. I've pretty much run out of ideas on this one, so any
>>> suggestions would be greatly appreciated!
>>>
>>> Regards,
>>>
>>> David Bobbett, Milton Keynes, UK.
>>>
>>>
>>>
>>>
>>>
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