User's Manual

2 MDS TransNET I/O Guide MDS 05-2708A01, Rev. A
• 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
• Same hardware for master or remote configuration
• Data latency typically less than 10 ms
• Supports EIA-232 (formerly called RS-232) and RS-485 user
interface
• Low current consumption–5 mA or less average draw in “sleep”
mode.
Model Configuration Codes
The radio model number is printed on the end of the radio enclosure, and
provides key information about how the radio was configured when it left the
factory. See Figure 2 for an explanation of the model number characters.
Graphic is pending.
Figure 2. MDS TransNET 900™ transceiver model configuration codes
Invisible place holder
2.1 Spread Spectrum Radios—How Are They
Different?
The main difference between a traditional (licensed) radio system and the
MDS TransNET 900™ transceivers is that these units “hop” 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 available network addresses, thereby minimizing the chance of
interference with other spread spectrum systems. In the USA, and certain other
countries, no license is required to install and operate this type of radio system.
2.2 Typical Applications
Multiple Address Systems (MAS)
This is the most common application of the MDS TransNET 900™
transceivers. It consists of a central control station (master) and two or more
associated remote units, as shown in Figure 3. An MAS network provides
communications between a central host computer and remote terminal units
(RTU’s) or other data collection devices. The operation of the radio system is
transparent to the computer equipment. When used in this application, the
transceiver provides an excellent alternative to traditional (licensed) MAS
radio systems.
THIS INFORMATION IS
SUBJECT TO CHANGE.
DO NOT USE FOR
PRODUCT ORDERING.