Signalling and communicationQuestion 124 of 1506

Which two serial standards are widely used to link devices in noisy plants over more than half a mile?

  1. RS-232C and USB
  2. RS-422A and RS-485
  3. Centronics and SCSI
  4. Bluetooth and FireWire
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Correct answer: RS-422A and RS-485

They overcome the distance and speed limits of RS-232C.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 14.2: Networks and Busses

Practice signalling and communication

Questions last reviewed: 18 October 2026