[time-nuts] PRS10 and missing serail port communication

Mike Cook michael.cook at sfr.fr
Wed Mar 2 16:14:46 EST 2016


> 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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