Data Cables / MD9
Limited Availability ›
This product has limited availability. It will be replaced by: MD485. Some accessories, replacement parts, or services may still be available when it is no longer available.
MD9 Coax Multidrop Interface

Overview

Effective 1 January 2004, the MD9 Multidrop Interface was generally replaced for new multidrop applications by the MD485 Multidrop Interface. However, the MD9 remains available for customers with existing MD9 networks.

The MD9 Multidrop Interface links a computer to as many as 200 dataloggers over a single coaxial cable. Each datalogger in the network is connected to an MD9 that has a unique, user-assigned address. Communication between the computer and a specific datalogger is routed through the MD9’s address allowing the rest of the network to remain in quiescent mode. Total coaxial cable length can be up to three miles; each MD9 in the network slightly reduces the maximum transmission distance.

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Technical Description

Effective 1 January 2004, the MD9 Multidrop Interface was generally replaced for new multidrop applications by the MD485 Multidrop Interface. The MD9 remains available for customers who have MD9 networks currently deployed in the field. MD9s and MD485s can NOT be used in the same network.

The MD9 Multidrop Interface links a central computer to up to 200 data loggers on a single coaxial cable. Total cable length can be up to 3 miles. At least two MD9s are required within a network.

Specifications

Baud Rates 9600, 1200, 300 (hardware-selectable)
Current Drain
  • 1.2 mA (quiescent)
  • 80.0 mA (active)
Operating Voltage 5 Vdc (from the PS150 or SC532(A) interface)
Carrier Frequency 1.2 MHz
Operating Temperature Range
  • -25° to +50°C (standard)
  • -55° to +85°C (extended)
Dimensions 16.2 x 8.8 x 3.0 cm (6.4 x 3.5 x 1.2 in.) including connectors
Weight 227 g (8 oz)

Compatibility

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Dataloggers

Product Compatible Note
CR1000 Requires LoggerNet 4.2 or higher.
CR200X (retired)
CR216X (retired)
CR3000 Requires LoggerNet 4.2 or higher.
CR5000 (retired)
CR800 Requires LoggerNet 4.2 or higher.
CR850 Requires LoggerNet 4.2 or higher.
CR9000X

Resources and Links


FAQs for

Number of FAQs related to MD9: 1

  1. Yes, but only if all the other data loggers are PakBus devices, such as the CR800, CR850, and CR1000.

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