Gerhard Fiedler wrote:
> jtroxas wrote:
>
>   
>> Cant find any info on rs232 ring networks on the net..
>> But I thought of some idea about it..
>> When you talk about A talks to B and B talks to C.. Is it something like 
>> this..
>> TXpin of A connected to RXpin of B
>> TXpin of B connected to RXpin of C
>> TXpin of C connected to RXpin of A
>> all Max232Chips sharing the same ground...
>>
>> A only talks to B and B only talks to C and C to A..
>>
>> so that when B wants to talk to A.. the data has to be passed like this..
>> B sends to C, C sends to A...
>> and A replies to B directly...
>>
>> is this RS232 ring networking??
>>     
>
> Sounds like it; it definitely could work if you can live with the delay
> (and with the fact that the whole network is partially down when one node
> is down). 
>
> But you could also use a RS485 network. All are on the same two wires, the
> drivers can handle some ground differences
IIRC they can handle some but not very much (about 12V or so for the 
chip I looked at), If running RS-485 I'd certainly want a ground line 
running alongside the data pair (maybe use both cores of a second pair 
in a cat5 or similar cable).


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