User's Manual

2 MDS TransNET I&O Guide MDS 05-2708A01, Rev. D
• 65,000 available network addresses
• Network-wide configuration from the Master station eliminates most
trips to Remote sites
• Data transparency ensures compatibility with virtually all asynchronous
SCADA system RTUs
• Peak-hold RSSI averaged over eight hop cycles
• Operation at up to 115,200 bps continuous data flow
• Store-and-Forward repeater operation
• Data latency typically less than 10 ms
• Same hardware for Master or Remote configuration
• Supports RS/EIA-232 and RS/EIA-485 user interface
• Low current consumption; typically less than 3 mA in “sleep” mode
NOTE: Some radio features may not be available on all models, or limited by the options
purchased, or the applicable regulatory constraints for the region in which the
radio will operate.
2.2 Model Number Codes
The radio model number is printed on the label on the end of the radio’s enclo-
sure. It provides key information about how the radio was configured when it
was shipped from the factory. This number is subject to many variations
depending on what options are installed and where (country) the product is
used. Contact MDS is you have questions on the meaning of the code.
2.3 Spread Spectrum Radios—
How Are They Different?
The main difference between a traditional (licensed) radio and the
MDS TransNET transceiver is that this unit “hops” from channel to channel
many times per second using a specific hop pattern applied to all radios in the
network. A distinct hopping pattern is provided for each of the 65,000 avail-
able network addresses, thereby minimizing the chance of interference with
other spread spectrum systems. In the USA, and some other countries, no
license is required to install and operate this type of radio system, provided
that RF power and antenna gain restrictions are observed.
2.4 Typical Applications
Multiple Address Systems (MAS)
This is the most common application of the transceiver. It consists of a central
control station (Master) and two or more associated Remote units, as shown
in Figure 2. An MAS network provides communications between a central
host computer and remote terminal units (RTUs) or other data collection