RS-485 transmission interface

In the RS-485 standard, one twisted pair of wires is used to transmit and receive data, sometimes accompanied by a shielding braid or common wire.

Electrical and temporal characteristics of the RS-485 interface

• Up to 32 transceivers in one network segment.
• Maximum length of one network segment: 1200 meters.
• Only one transmitter can be active at a time.
• Characteristics of the exchange rate /length of the communication line:
  • 62.5 kbit /s 1200 m (one twisted pair),
  • 375 kbit /s 500 m (one twisted pair),
  • 500 kbps, 1000 kbps, 2400 kbps 100 m (two twisted pairs),
  • 10,000 kbps 10 m.