[time-nuts] Help with BG7TBL 2015-07-08 GPSDO

[Patrick Murphy]

Well, that was the easiest answer. The issue can also be the interface
settings - baud rate, stop bits, and parity need to match on both sides of
the connection. I suggest you try using something like "putty" to monitor
the port on your PC side. This will allow you to see if there is any data
present at all. It will often display garbage if data is present but port
settings are wrong. It will allow you to play with different settings to
try and find the correct combination.

The greater challenge is if putty shows nothing or refuses to connect. That
can take you back to square one. You had mentioned having a scope to look
at the interface. Hopefully it has the ability to decode data and show what
is going on.

One last notion. Are you certain you have the correct device drivers for
your RS232 interface on the PC? Physical RS232 ports have well established
drivers. Drivers for USB based virtual RS232 ports can be dodgy depending
on the exact hardware you have.

-Pat (KG5YPQ)


On Sat, Feb 1, 2020 at 10:41 AM Gary Woods <garygarlic at earthlink.net> wrote:

> I can't seem to get Lady Heather to talk to it, though I don't get the
> "no radio" message when the DB9 cable is plugged into the unit.
> Contains:
> Ublox LEA-ST-0-002 receiver
> Oscilloquartz OCXO 8863-XS  oscillator
> The RS-232 interface is a MAX3232 chip.
> I can see data sent when LH starts up on an RS-232 tester in the line;
> next step perhaps to scope transmit data in/out on the MAX3232.
>
> Does this box send anything on power up?
> Any known "gotchas" with it?
>
> Antenna seems good; no warning LED when it's connected, and after
> warmup Sys Lock LED is on solid.
> I'm mostly using the 10mHz output to clock an ancient kit-built Davis
> counter for Ham radio stuff, so not anywhere near the levels of
> time-nuttery I see here.
>
> TIA,
>
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