KB012 How long could be the RS-232 data cable? [ru]

The RS-232 interface is not designed for long data cables (no differential signals). The maximal cable length is mainly defined by the data rates of the RS-232 interface. See the following guidelines:

  • 9’600 Baud → up to 152m
  • 19’200 Baud → up to 15m
  • 115’200 Baud → up to 2m

The cable length is also influenced positive or negative by other factors:

  • Quality of the cable (Shielding, wire resistance, etc.)
  • Environmental conditions (Disturbance sources like motors, etc.)