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-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David Bobbett
Sent: Wednesday, August 18, 2010 4:23 AM
To: time-nuts@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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