Re: [Svxlink-devel] Data Communication Protocol

[Norbert S. <nse...@ds...>]

Aleks,
your comments are very much appreciated. Must have overlooked the JP2 
and its function
but I was pretty close with my theory. The RX ID will wind up in my 
Firmware and can be set by
RS232 using a terminal program and write it into EEPROM when done.
Great idea to signal the end of DTMF via a bit. Saves some hardware for 
muting.
I'll hook up my prototype interface and see how SVXLINK is acting with 
my firmware.
The hardware design can route audio both ways i.e. act as input or as 
output via mode
jumper. COR and PTT are automatically switched to the proper logic.
Also, I think it will work fine with host detection SVXLINK or Echo-Link 
though I haven't tested it yet.

Thanks again!
Regards,
Norbert, KJ6ZD

Aleksander S. wrote:
> On Sat, 4 Oct 2008 at 20:57:51, Norbert Seibert wrote:
>
>   
>> I haven't seen anything on Aleks interface that could distinguish between RX0
>> and RX1 unless SVXLINK can do something with this bit.
>>     
>
> The "RX address" of the particular interface is set by JP2.
>
>   
>> The three function bits, I guess that f2 and f1 is actually for future use.
>>
>> f0 is telling SVXLINK that a DTMF char comes along according to the decoded
>> nibble.
>>
>> Since the interface is sending the "event" only if there was an event, I
>> don't understand what 
>> f0 = 0 does. Unless it is for future purpose and implemented now I don't see
>> its purpose yet.
>>     
>
> f0 = 0 signals the end of DTMF tone detection. This is important for SVXlink 
> to handle DTMF muting properly.
>
>
>   
>> So I assume that SVXLINK does not ask for anything, besides I have seen on
>> Aleks interface that there is only the TXD available. So, SVXLINK couldn't
>> send anything to the Interface, even if it wanted to.  
>>     
>
> Currently SVXlink transmits to the interface nothing. Therefore the second "RX 
> section" of the interface's RS-232/UART converter (MAX232) is used to drive a 
> LED.
>
> 73 de Aleks
>
>
>
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