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

Thu, 19 Aug 2010 00:23:16 -0700 

 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: [email protected] [mailto:[email protected]] On
Behalf Of David Bobbett
Sent: Wednesday, August 18, 2010 4:23 AM
To: [email protected]
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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