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

Bryan _ bpl521 at outlook.com
Mon Nov 20 02:26:46 EST 2017

Did the serial communication ever work?. There is so many variations of the FE's that it's hard to know if it was even supported for that particular model or option. I have one and it has a serial port, but does not respond to any commands.


From: time-nuts <time-nuts-bounces at febo.com> on behalf of Jonas Jalling <jonas at jalling.dk>
Sent: November 19, 2017 12:20 AM
To: time-nuts at febo.com
Subject: [time-nuts] FE-5680A not responding to serial commands

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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