RE: xAP - The Proposed Architecture Explained...

[Robert Chasmer <robert.chasmer@xxxxxxx>]

Paul Gordon [mailto:paul_gordon@xxxxxxx] drew:-
> Whereas Multi-drop =
> 
> -----+-------+--------+------
>            
        
>            
        
>      _      
_        _
>     _    
_      _
> 
> And would it also be true to say that electrically, these are 
> effectively the same? (assuming the devices are passive)

Ok, love the ascii art, but I'm starting to loose focus on the current
hardware plan.  Lots of things have been discused, RS232, RS423, IP,
On Wire
etc, but I'm not sure where everything COULD fit in.  Is each display
going
to join the IP network with its own address? Are we going to have a
single
Controler that forms the link between all the devices and a single IP
address? Or a single PC that does all the grant work with as any RS232
points as required?

The one idea I don't like is that we will be broadcasting messages to
the
whole network eg x.x.x.255, regularly for the displays to operate. 
I
appreciate that this would easily allow several machines/devices with
different IP addresses to recieve and process display messages but is
this
really neccessary.  I know that the size of messages should be low
etc. but
thats not really the point.

In a mad attempt to try and guess the current state of play I'll try my
own
bit of ascii art (DISCALIMER THIS IS PROBABLY ALL WRONG!)
    
========++===============================++==== IP Network (Cat 5) 
       
                              
+------++----------------+   +----------++-------------+
Display Controller         PC 01 (Mail, News,
Temp,
Recieves Disp Messages     Weather) Sends Messages  .. Other
PCs
at 192.168.10.20:1739      to 192.168.10.20:1739  
or 192.168.10.255:1739     or BCast 192.168.10.255 
+--------------+---------+   +-------------------------+
               
               
========+=======+=======+===============+====== RS423 (Could be Cat 5)
       
              
              
     [423/232]     
[423/232]      [423/232]
       
              
              
   +----+----+    
+----+----+     +----+----+
     RS232         RS232 
       RS232  
    Disp 01       Disp 02
      Disp 03 
   +---------+    
+---------+     +---------+

I Look foward to the website that Mark mentioned, and some working
protypes
on display so to speak.


Rob
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