RETIRED ›
This product is no longer available and has been replaced by: MD485. Some accessories, replacement parts, or services may still be available.
MD9 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.

Read More

Images

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

Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Dataloggers

Product Compatible Note
21X (retired) The 21X should have a serial number of 6195 or higher (others require factory modification and an RMA).
CR10 (retired)
CR1000 Requires LoggerNet 4.2 or higher.
CR10X (retired) The -PB versions of the CR10X requires LoggerNet 4.2 or higher.
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired) The -PB versions of the CR23X requires LoggerNet 4.2 or higher.
CR295X (retired)
CR3000 Requires LoggerNet 4.2 or higher.
CR500 (retired)
CR5000 (retired)
CR510 (retired) The -PB versions of the CR510 requires LoggerNet 4.2 or higher.
CR800 Requires LoggerNet 4.2 or higher.
CR850 Requires LoggerNet 4.2 or higher.
CR9000 (retired)
CR9000X

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.

Case Studies

San Diego: Slope Monitoring
The North County Transit District (NCTD) of San Diego County, California, determined that three segments......read more
Australia: OzFace—Carbon Dioxide and Climate Change
An experimental facility (OzFace) has been established in Townsville, Australia to examine the impacts of......read more

Privacy Policy Update

We've updated our privacy policy.  Learn More