[time-nuts] My stubborn Z3801A

Adrian rfnuts at arcor.de
Mon Jun 14 21:12:57 EDT 2010


Bob,

as by the Z3801 manual, the (RS422) port (of your PC) has to match the 
following settings:
Pace: None
Baud Rate: 19200
Parity: Odd
Data Bits: 7/chr
Start Bits: 1
Stop Bits: 1
There is no auto interface configuration mode inside the 3801. If the 
settings are wrong or the cable isn't correct, nuthing's gonna happen.
When you have installed SatStat on your PC, check if the default 
settings are correct, and select the COM port of your PC that you have 
connected the cable to.
If everything is right, select Comm Port -> Port Open. After a while, 
communication with the 3801 should be established, and the main form 
should begin to periodically update every few seconds.
Shoot me a PM if you don't have the manual.

Btw. I've now installed Ulrich's superb Z38XX that is much more 
versatile than the basic SatStat.

Adrian



Robert Benward schrieb:
> 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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