[time-nuts] PRS10 and missing serail port communication

Jim Harman j99harman at gmail.com
Thu Mar 3 17:15:07 EST 2016


Make sure Rx on the converter is connected to Tx on the PRS10 , Tx to Rx,
and the polarity is correct. The transmit lines should be at 0 V when idle.
Not sure about the PRS10, but official RS-232 requires the idle (Mark)
voltage to be -3 or lower.

On Thu, Mar 3, 2016, 5:00 PM Philip Zahariev via time-nuts <
time-nuts at febo.com> wrote:

> I forgot to tell you, that during tests I use TTL (5V) level USB to serial
> converter.
>
> -----Original Message-----
> From: Mike Cook [mailto:michael.cook at sfr.fr]
> Sent: Wednesday, March 2, 2016 11:15 PM
> To: Philip Zahariev; Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] PRS10 and missing serail port communication
>
>
> > Le 2 mars 2016 à 15:50, Philip Zahariev via time-nuts <
> time-nuts at febo.com> a écrit :
> >
> > Hello group,
> >
> > Recently obtained from eBay PRS10 marked as no-lock. Of course my
> > first task was to open device and see what is current state of lamp,
> capacitor and etc.
> > surrounding parts. My surprise was that all things look pretty good
> > (of course is used). And frequency is not correct :-) Actualy first
> > 1-2 minutes frequency is pretty close to 10 MHz, but after all thing
> > is ready (hot) frequency go far away.
> >
> > My questions:
> >
> > 1. How bright should be the light from lamp? Few seconds after power
> > is applied to device lamp start shining, but I can see only if room
> > light is close to dark or if I use magnifying glass focused on hole for
> inspection.
> >
> > 2. I cannot communicate with PRS10 using RbMon10 (software from SRS).
> > Only obtain repeatable characters from PRS10 if start terminal program
> > with baud rate 9600 baud, 8 bits, no parity, with 1 start and 1 stop
> > bit and no answer of any command according manual. Double checked
> > according schematics and port is configured as serial. Any advice how to
> obtain communication?
>
>   RbMon10 will normally configure the PC serial port correctly. So it
> might be due to voltage levels? The PRS10 port is 0-5V TTL and not the
> usual +/-12V RS232 levels.
>  Also it requires XON/XOFF protocol. That would need to be configured for
> a Terminal prog connection.
>
>
> >
> > Best regards
> > Philip
> >
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