Re: RS232/482 Qs

["PatrickLidstone" <patrickl@xxxxxxx>]

The maximum cable length in the spec. is 50ft, but this is specified 
for 20kBaud. Given that the spec. was written in 1967, and technology 
has marched on, you will be able to achieve *considerably* longer 
distances at 9k6 - 50m should be readily achievable, 100m quite 
possible, with the limiting factor being the cable's capacitance (low 
capacitance is good) and, to a lesser extent, resistance (low 
resistance is good).

Note that these figures are for RS232, not RS232C. RS232C uses TTL 
(+/- 5V level signals), as opposed to +/- 12V signals used by RS232 
proper, which offers much greater noise immunity and are therefore 
able to cover much greater distances. 

Patrick

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