HI

So at least there is one way communications from the GPS box to the slave box. 

Bidirectional com would be a bit complex given the lack of UART’s on the pc 
board. I’d bet it just runs through a standard set of messages on the GPS and 
watches the results. The way to quickly prove I’m wrong would be to issue a 
command to the GPS from the slave that it must respond to. Something like go 
into survey mode or set the location to xxx yyy zzz.  I’ve certainly been wrong 
before. 

I suppose they could do dual source TTL com directly at the GPS module level. 
I’d think that would drive the GPS unit a bit nuts when the slave started 
switching things around….

Bob


> On Nov 2, 2014, at 4:16 PM, n2lym <[email protected]> wrote:
> 
> Yes the diagnostic port on the slave unit diaplay's gps data just like the 
> Z3811. Therefore there must be serial data being exchanged on the 15 pin 
> interconnect.
> 
> 
> Mike
> 
> N2LYM
> 
> 
> 
> 
> 
> Message: 5
> Date: Sun, 2 Nov 2014 15:58:20 -0500
> From: [email protected]
> To: [email protected]
> Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A,
> Z3810A, Z3811A, Z3812...
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="UTF-8"
> 
> Just another thought though, does the diagnostic port on the slave also
> communicate with SatStat etc?
> 
> That would imply at least a transfer of serial data in one  direction, even
> if not for the control functions.
> 
> Regards
> 
> Nigel
> GM8PZR
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