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20 mA Current Loop
The 20mA current loop or TTY is not an RS- or V. standard. Despite this 20 mA current loop has been used in industrial system for decades now and was a de facto standard long before the standards used today, like RS-232/V.24 and RS-422/485.
Westermo current loop converters can be set to either active or passive on both transmitter and receiver.
It is possible to transmit up to distances of 6 km at lower data rates using 20mA current loop.
MA-21 AC
  • Conversion between 20mA and
    RS-232/V.24 interface
  • Data transparent
  • Guarantees reliable long-distance communication
MA-21
MA-29
  • Conversion between 20mA and RS-232/V.24 interface
  • Data transparent
  • Rack Mounting
  • Guarantees reliable long-distance communication
MA-29
MD-21
  • Conversion between 20mA and RS-232/V.24 interface
  • Data transparent
  • Guarantees reliable long-distance communication
  • 35 mm DIN rail mountable
MD-21