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

The RS-232 interface is not designed for long data cables (no differential signals). The cable length depends mainly on the data rates of the RS-232 interface.

See the following guidelines:

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

The cable length is also influenced positively / negatively by other factors:

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