[time-nuts] Temex LPFRS-01 analog frequency adjustement

Mark Spencer mspencer12345 at yahoo.ca
Mon Mar 7 19:48:38 UTC 2011


The doccumentation regardings RS232 controll looks usefull.   (I had not seen 
this before, and in case any one else is following this thread here is a link..)

Mark S


----- Original Message ----
From: Magnus Danielson <magnus at rubidium.dyndns.org>
To: time-nuts at febo.com
Sent: Mon, March 7, 2011 11:10:13 AM
Subject: Re: [time-nuts] Temex LPFRS-01 analog frequency adjustement

On 03/07/2011 07:45 PM, Mark Spencer wrote:
> Thanks.  I recall seeing documentation that more or less said that directly
> connecting these units to an RS232 port will typically work but is not
> guaranteed.  If you are able to easily check your unit that would be great but 
> will likely try connecting mine to an RS232 port in the next few weeks.

It's easy enough to access. But much easier is it to go to Spectratime website 
and download the manual:

Already on page 1 I can read the label of the photo which says

6 : TXD (TTL)
9 : RXD (TTL)

Which is a good hint. Start reading at page 10 in the manual.

> I wanted to get a sense of how well the unit is working prior to putting to 
> effort into this.  As it arrived with a circuit board that includes a 
> adjust trimmer it was pretty simple to test.
>  The spec sheet indicates that the smallest frequency step for  RS 232 control
> is 1X10-11, and I was also curious if finer frequency control was possible via
> the analog frequency adjust input.  I suspect that 1 x 10-11 is the limit but
> I'm not 100 percent sure of this.

See page 13 of the manual and you fill find your confirmation.

As for status, the serial interface should give you a bunch of status report. I 
just haven't taken the time to hook it up.


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