Likely what is happening is you are overrunning the RS232 interrupt buffer, and that is causing a write into code space. Odd that the firmware is changing, though.
Does this thing have Flash RAM, or battery backed NVRAM (Dallas)? Oftentimes, NVRAM using devices use the NVRAM for both firmware, and data RAM space. Things can get really ugly when that is done. Also, to test my guess, put a delay between each character sent to the FE-5680A. Say, 2 or 3 ms. Needless to say before you do this, you need to develop a way of restoring the firmware. -Chuck Harris Bert Kehren via time-nuts 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, [email protected] 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. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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