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Campbell Scientific

MD485 RS-485 Multidrop Interface

ClimateCommunications

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.

Quantity

Overview

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

Specification

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)