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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