[time-nuts] Brandywine GPS-4
Jeroen Bastemeijer
j.bastemeijer at tudelft.nl
Tue May 12 12:29:16 UTC 2009
Dear Magnus,
Thank you for your response!
The unit used to work.... so dip-switch, cable etc. are OK. The thing I
suspect is indeed, some problem with the FLASH and/or EPROM. However, I
have no useful source of information about that.
The initial question: "L=load ESC=run" has something to do with FLASH
restore, I think. However, the unit doesn't seem to repond to the
commands sent through the serial port. Do you know of any jumper inside
which could be used to force a new load of the flash? When I open up the
unit I see a number of jumpers inside, but I don't have a useful
description of their function.
73 Jeroen PE1RGE
Magnus Danielson wrote:
> Jeroen Bastemeijer skrev:
>> Dear All,
>>
>> I decided to switch on my Brandywine GPS-4 after some time on the
>> shelf. After start-up it takes some time, then the Alarm-LED starts
>> flashing...
>> When I look at the data coming from the serial port it keeps saying
>> "L=load ESC=run". Unfortunately the unit doesn't respond to any
>> command :-(
>
> A few comments from my own flimsy attempts...
>
> Using a straight 9 pin cable to the PC does not work well. The serial
> port needs to the cut out so the other signals does not confuse things.
>
> Also, check the serial configuration details. The manual gives details
> on how the DIP switch should be set.
>
> The GPS4 has a FLASH and a EPROM image, so you could have entered the
> backup EPROM image flash download mode.
>
> You just reminded me that I need to make some more serious attempts to
> get it up and running with serial interface too. It locks up without
> serial cable, so it is only me messing with it.
>
> The GPS4 can be modified to be used for external clock steering of
> OCXO and Rubidium sources, just as the Thunderbolt can.
>
> Cheers,
> Magnus
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