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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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Detailed 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 dataloggers 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

Datalogger Considerations

Compatible Contemporary Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR9000X
* * *

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X
#

Notes:
*The CR800/CR850, CR1000, and CR3000 require LoggerNet 4.2 or higher.

#The CR7 needs a CR700X Control Module with a serial number of 1670 or higher (others require factory modification and an RMA).

†The -PB versions of the CR510, CR10X, and CR23X require LoggerNet 4.2 or higher.

‡The 21X should have a serial number of 6195 or higher (others require factory modification and an RMA).


Frequently Asked Questions

Number of FAQs related to MD9: 1

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

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