Re: Extending the range of null modem to 100ft.

[Roger Johnstone <rojaws@orcon.net.nz>]

In <p%VNd.2603$aW6.1034@newssvr22.news.prodigy.net> Kelly Hall  wrote:
> A.J. wrote:
>> Is there a way that I can extend the range of my null modem 
>> connection from PC to GS by a long distance, say 100 feet?  I don't 
>> want to keep lugging my GS all the way from my bedroom to my living 
>> room every time I want to make a file transfer.  I looked at various 
>> wireless serial adapters, but I'm hard-pressed to find a pair of 
>> adapters within my price range (i.e. under $100 total).
> 
> You don't say why the data transfer currently fails, or the data rate, 
> but I'll assume you get data errors during the transfer.  This could 
> be  because the cable you're using is unshielded and picking up a lot 
> of  noise.  Or your two machines could have radically different ideas 
> of  what 'ground' is.  Or one machine is implementing TTL-level serial 
> ports  and not +- 12V RS-232.
>
> One solution would be to use something besides RS-232.  RS-422 would 
> be  a solution: you can get RS-232<->RS-422 converters from blackbox.
> com.  Put one on each end.

You'd only need to do the PC end, since the IIGS serial port is already 
RS422A.

-- 
Roger Johnstone, Invercargill, New Zealand
http://vintageware.orcon.net.nz/
________________________________________________________________________
  No Silicon Heaven? Preposterous! Where would all the calculators go?

              Kryten, from the Red Dwarf episode "The Last Day"