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27 sie 2015 · General guidelines says most cables will support 115k baud, using x-on/x-off protocol (stop start is data on tx/rx lines) are limited to 30M, or about 100' with shielded cable. UTP cables using this same protocol setup are limited to about half the speed, so maybe 56k.
29 mar 2001 · Maximum Cable Length. As we have seen, the cable-length specification once included in the RS-232 standard has been replaced by a maximum load-capacitance specification of 2500pF. To determine the total length of cable allowed, one must determine the total line capacitance.
4 mar 2021 · Using typical underwater cables, allowable combinations of cable length and baud rate for Sea-Bird instruments communicating with RS-232 are shown below: Maximum Cable Length (meters) Maximum Baud Rate*
the maximum length of cable, a maximum capacitive load of 2500 pF was specified which is clearly a more adequate specification. The maximum cable length is determined by the capacitance per unit length of the cable which is provided in the cable specifications.
Cable length is one of the most discussed items in RS232 world. The standard has a clear answer, the maximum cable length is 50 feet, or the cable length equal to a capacitance of 2500 pF. The latter rule is often forgotten.
Maximum utilization guidelines are recommended for all systems running at partial utilization. Cable length is dependent on the cable capacitance and crosstalk, and on the driver and receiver electronics. Cable lengths are decreased if the system is subjected to external noise or ground loops.
For cables that are 2000 feet or less, a termination resistor is not needed at baud rates of 9600bps or less. If a termination resister is required, a 120Ω or greater should be used.
