[time-nuts] My stubborn Z3801A

Robert Benward rbenward at verizon.net
Mon Jun 14 20:00:49 EDT 2010


Adrian,
I thought that was for the Satstat, is the 3801 auto sensing?  Don't you need to send a command?

Bob

----- Original Message ----- 
From: "Adrian" <rfnuts at arcor.de>
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Sent: Monday, June 14, 2010 5:29 AM
Subject: Re: [time-nuts] My stubborn Z3801A


> It's in the same menu where you start / stop communication, just below 
> the 'Port Open' command.
> 
> CommPort > Settings > Baud Rate
> 
> Adrian
> 
> Robert Benward schrieb:
>> The minimum voltage is +/-3 volts, I'm getting about +/-6 right now.
>>
>> How does one change the serial port speed, I don't see anything in 
>> SatStat.
>> Bob
>>
>>
>> ----- Original Message ----- From: "John Miles" <jmiles at pop.net>
>> To: "Discussion of precise time and frequency measurement" 
>> <time-nuts at febo.com>
>> Sent: Sunday, June 13, 2010 8:21 PM
>> Subject: Re: [time-nuts] My stubborn Z3801A
>>
>>
>>>
>>>> Still to go:  The RS-232 signals look fine going into the cable,
>>>> +/-5V, any
>>>> ideas why the computer won't read it?  Am I missing something?  I
>>>> tried two
>>>> different ports in case I screwed one up one of the ports, but no luck.
>>>
>>> Haven't been following the thread so someone may have suggested this 
>>> before,
>>> but: try another computer, a shorter cable, or perhaps a slower baud 
>>> rate.
>>> 5 volts is near the bottom of the range for RS232 (the signalling 
>>> levels are
>>> supposed to be closer to +/- 15V, or at least +/- 12V).
>>>
>>> Some RS-232 gear is happy with 5V but it isn't optimal in all cases.  
>>> The
>>> problem you mention is more likely to be either a physical or 
>>> protocol-level
>>> mismatch than a real hardware fault.
>>>
>>> -- john, KE5FX
>>>
>>>
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> 
> 
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