RS-485

RS-485

Applications:

  • Industrial equipment
  • Machine to Machine (M2M) communications
  • Industrial Control Systems, including the most common versions of Modbus and Profibus
  • Programmable logic controllers
  • RS485 is also used in building automation
  • Interconnect security control panels and devices

 

  • Standard: EIA RS-485
  • Physical media: Twisted pair
  • Connector: DB9
  • Network topology: Point-to-point, Multi-dropped, Multi-point
  • Maximum devices: 32 drivers or receivers
  • Mode of operation: Differential signaling
  • Maximum speed: 460800 bps
  • Voltage levels: -7 V to +12 V
  • Mark(1): Positive voltages (B-A > +200 mV)
  • Space(0): Negative voltages (B-A < -200 mV)
  • Available signals: Tx+/Rx+, Tx-/Rx-(Half Duplex)Tx+,Tx-,Rx+,Rx-(Full Duplex)