[time-nuts] Re: Fei FE-5680A RS-232 interface.

[Bob Camp]

Hi

The reason for not finding a clear answer is unfortunately fairly simple:

FEI sold a number of different devices as FE-5680’s. They all got similar part numbers. 

Next, the design of even specific devices changed at least three times over the “lifetime” of the device. 

Finally, some of these sell better than others. There is a very real empire of folks who modify the 
less desirable versions ( no 10 MHz out ….) to add the missing features. 

Simple answer on any of them: 

Hook up the power and make sure it at least boots. See if it locks. If not, dive into fixing that problem.

Then take a look at the various in’s and outs on your specific device. 

You might have some luck comparing pictures of the “connector surface” on your device to various other
examples. Some of the “rebuilt” parts have connectors in slightly odd locations. 

Bob

> On Jul 25, 2023, at 4:30 PM, Rob040 . via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Dear all,
> 
> I bought myself a Fei FE-5680A with P/N 217400-30352-1, see the picture.
> I found out that this is a 10MHz version, also has a 1PPS output, lock indicator and a RS-232 interface. My question is about that latter, is it a real RS-232 port, or do I need to add an external MAX232 or MAX3232 to get it going with the proper levels?
> Could not find a clear answer on the wide web...
> 
> Best regards, Rob
> 
> 
> <FE-5680A foto.jpg>_______________________________________________
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