Hi Neville,
I use USB-Serial converters. Brand is"Sweex", 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 reported this to the
Time-nust list. Someone suggested to update the driver , to the latest
version. For me it worked out! It's working fine ever since.
In you case you might do the following things:
* connect a scope to the RS-232 pins to check the logic levels.
* use the USB converter with another PC, maybe the USB port cannot
supply the current needed (or use a USB-HUB with power supply in series).
Good luck!
73 Jeroen PE1RGE
Neville Michie wrote:
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 my HOBO
loggers.
The USB/Serial converters are a little difficult to use, sometimes
hanging, necessitating
unplugging and plugging back in. They get assigned to various Port
numbers but tend to keep
the same number from day to day. The ports can be configured in the
management function.
However the TBOLT refuses to talk to the converter, to the extent
that I thought that I must have
damaged the TBOLT.
Today, as a last resort, I remembered an old PC, dragged it out and
stoked it up, and to my delight
the TBOLT monitoring program ran without difficulty under Windows
2000 with a conventional serial port.
Now I vaguely remember talk about RS232 communications and the need
for pull up or down
resistors and supplies, but searching the archives I could find
nothing relevant.
Can anyone tell me how I could run the TBOLT off a USB/Serial converter?
cheers, Neville Michie
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