Hi,
I have just spent a week or two trying to talk to a Trimble Thunderbolt.
I have a laptop running VISTA, about which there is little to say.
The laptop has no serial ports, but I have some USB/Serial converters
that successfully run
my HP 3815A and a Samsung GCRU/D, and also communicate with
Hi Neville,
I use USB-Serial converters. Brand isSweex, there is a common
USB2serial chip inside. There was no need to modify anything (pull up
resistors or what so ever).
First I had communication, but from time to time strange behaviour. It
made me think the Thunderbolt was faulty... I
Nevil:
In my business we use/ supply serial to parallel converters for
programming our product originally designed for serial. We ran into
most of the problems you have described. The hanging appears to be a
windows problem (we use XL pro mostly). Ours uses the Prolific
converter and
I had the same problem with some other devices, and I took apart
several converters.
Most of them were unable to generate sufficient levels for a proper
communication with rs232.
Internal charge pump was generating +-6V instead of +-12 or +-15
that is normal for rs232.
Putting additional
based
problem.
Best regards
Ulrich
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Von: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Im Auftrag von Predrag Dukic
Gesendet: Mittwoch, 24. September 2008 15:10
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] TBOLT
Pasadena, CA, 91109
+1(818)354-2075 phone
+1(818)393-6875 fax
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Predrag Dukic
Sent: Wednesday, September 24, 2008 6:10 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] TBOLT
Hi Neville,
I do run my Thunderbolt very successful for quite a while and I do use either
my stationary PC (running still with Win2000 on com1 or 2) or with my Laptop
(Lenovo T43p with Win XP pro and USB2 ports) and had
never a connection problem. For the connection to the USB port I use in
, September 24, 2008 6:10 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] TBOLT communication
I had the same problem with some other devices, and I took
apart several converters.
Most of them were unable to generate sufficient levels for a
proper
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Predrag Dukic
Sent: Wednesday, September 24, 2008 1:23 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] TBOLT communication
Lux,
my hardware experiences
Not only that. The TTL are more frequently 3.3V TTL, and the TTL to
RS-232 converters are supplied from 3.3V and uses a charge pump doubler
and a charge pump inverter. Barely +/-6V. Usually they are designed for,
and use, 100nF capacitors... the less expensive ones :) And a bigger
capacitor
One of the converters didn't have any voltage
pre-regulation for both the chips, and also one
of my pcs gives 6 volts on USB ports
That combination worked the best and could talk
to virtually all my rs232 devices. I don't
remember now the output 232 levels but they were close to 10V
6V x
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