[time-nuts] FE-5680A not responding to serial commands

Jonas Jalling jonas at jalling.dk
Sun Nov 19 03:20:31 EST 2017

Hello all,
I have an old FE-5680a I bought years ago, that surfaced from my storage
boxes the other day. I thought I would experiment with disciplining it to
my M12+t GPS. I have some problems adjusting the frequency though.
If I put a scope on pins 5 and 7 of the DS80C323 processor, I can see the
serial input (ie. 0x2D 0x04 0x00 0x29), but the processor never responds.
Has anyone seen this problem before, and is there a way to fix it? Could
the serial adjust be disabled? And if so, is there any way to enable it?

Thanks in advance,
BR Jonas

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