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

Brooke Clarke brooke at pacific.net
Wed Aug 18 15:58:08 UTC 2010


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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