On Monday 02 Nov 2009, narendra sisodiya wrote:
... snip ...
from : http://en.wikipedia.org/wiki/RS-232
"The standard does not define a maximum cable length but instead
defines the maximum capacitance that a compliant drive circuit must
tolerate. A widely-used rule-of-thumb indicates that cables more than
50 feet (15 metres) long will have too much capacitance, unless
special cables are used. By using low-capacitance cables, full speed
communication can be maintained over larger distances up to about
1,000 feet.[7] For longer distances, other signal standards are
better suited to maintain high speed."
