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MD485 RS-485 Multidrop Interface

The MD485 is an intelligent RS-485 interface that permits a PC to address and communicate with one or more data loggers over a distance of up to 1200 m. This interface also supports data-logger-to-data-logger communication, callback from a remote data logger, PC-to-printer communications, and digital camera-to-data-logger connections.
Environment | Communications | Campbell Scientific
  • The MD485 is an intelligent RS-485 interface that permits a PC to address and communicate with one or more data loggers over a distance of up to 1200 m.
  • This interface also supports data-logger-to-data-logger communication, callback from a remote data logger, PC-to-printer communications, and digital camera-to-data-logger connections.

Benefits and Features

  • Compatible with most Campbell Scientific data loggers
  • Can be used with a phone modem, Ethernet link, or spread spectrum radio to extend the distance between the data logger and PC
  • Increases the distance allowed between a CC5MPX digital camera and a PakBus data logger
  • Extends the distance between AVW200 Vibrating-Wire Interfaces for situations where wireless communication is impractical
  • Internal buffering ensures that data is not lost during transmission and allows each side to operate at different baud rates
  • Includes gas tubes on the RS-485 ports and a ground lug for better surge protection
  • Communicates at rates up to 115.2 kbps
Function Permits a PC to address and communicate with one or more data loggers over a distance of up to 1,200 m.
Transmission Distance or Area 1,219 m (4,000 ft) Can increase distance by using more MD485s or combining with spread-spectrum radios, Ethernet, or phone.
Baud Rates 1200, 9600, 19.2k, 38.4k, 57.6k, 115.2k bps
Voltage 12 Vdc (from data logger or pn 15966 wall charger)
Surge Complies with IEC61000-4-5, test level 3 (±2 kV, 2 Ω coupling impedance)
Operating Temperature
  • -25° to +50°C (standard)
  • -55° to 85°C (extended)
Service Requirements CABLE2TP two-twisted pair cables must be installed between networked data loggers and base
Maximum Cable Length 1,219 m (4,000 ft)
Dimensions 15.88 x 6.35 x 1.91 cm (6.25 x 2.5 x 0.75 in.)
Weight 127.6 g (4.5 oz)