[time-nuts] Have I wrecked my FE-5680A?

[Nick Sayer]

In principle, nothing I was ostensibly sending should have written to EEPROM. I *did* catch and fix a bug that was sending one too few bytes in the 0x2E command, but if they had their shit together they should have had checksum mismatches and ignored them. 

Sent from my iPhone

> On Apr 29, 2016, at 5:54 AM, Tim Shoppa <tshoppa at gmail.com> wrote:
> 
> EEPROM endurance? Tendency for EEPROM to get corrupted when written to just
> after power-up?
> 
> See https://www.febo.com/pipermail/time-nuts/2014-October/087324.html
> 
> Tim N3QE
> 
> On Fri, Apr 29, 2016 at 7:11 AM, Bert Kehren via time-nuts <
> time-nuts at febo.com> wrote:
> 
>> Sadly yes
>> The reason we have not released our GPSDO for the FE5690/50 and FE405 is
>> that we have experienced the same on all three devices. You are the 9th
>> case
>> that I know of. We know very little as to what exactly causes it but we are
>> incorporating circuitry to prevent it. What we know is that it is not a
>> particular code sequence on the RS232 port, but what happens the operating
>> code  is turning to mush. Some how the RS port is involved. Serious flaw on
>> all  FE devices since most likely the code was written by the same
>> individual.
>> Bert Kehren
>> 
>> 
>> In a message dated 4/28/2016 9:02:28 P.M. Eastern Daylight Time,
>> time-nuts at febo.com writes:
>> 
>> Just as I  started testing the GPS discipline board prototype, my FE-5680A
>> seems to have  developed a very odd problem.
>> 
>> If I give it power, it outputs a “kinda”  10 MHz sine wave while it sweeps
>> around looking for a physics lock. This is as  expected.
>> 
>> About the time that I would expect the lock light to turn on,  instead the
>> output just stops. The lock light never comes on.
>> 
>> This  unit’s been working fine for months now. It’s conceivable that I’ve
>> sent it  some sort of serial command it couldn’t digest, but using the
>> Windows  calibrator software seems to work - albeit there not being any
>> output
>> from the  oscillator at  all.
>> 
>> 
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