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MDS TransNET 900 I&O Guide
MDS 05-2708A01, Rev. B
4.4 Configuring a Network for Extensions
The installation and configuration of an MDS TransNET 900 network with
Extensions is straight-forward with only a few unique parameters that need to
be considered and set at each unit.
In every network there can be only one Master station. It will serve as the sole
gateway to the outside world. The tables in
Store-and Forward Services” on Page 49
detail the parameters that will need
to be set on each type of radio in the network. For a detailed description of
this network design, please
see “Extension Operation with SAF” on page 46
.
4.5 Using the Radio’s Sleep Mode
(Remotes Only)
In some installations, such as at solar-powered sites, it may be necessary to
keep the transceiver’s power consumption to an absolute minimum. This can
be accomplished using the radio’s Sleep Mode feature. In this mode, power
consumption is reduced to about 8 mA.
Sleep Mode can be enabled under RTU control by asserting a ground (or
EIA/RS-232 low) on Pin 4 of the radio’s
DATA
connector. The radio stays in
Sleep Mode until the low is removed, and all normal functions are suspended.
The radio can be “awakened” by your RTU every minute or so to verify
synchronization with the master station. When Pin 4 is opened (or an
EIA/RS-232 high is asserted), the radio will be ready to receive data within
75 milliseconds.
NOTE:
The
SLEEP function must be set to ON; otherwise a ground on Pin 4 will be
ignored.
It is important to note that power consumption will increase somewhat as
communication from the master station degrades. This is because the radio
will spend a greater period of time “awake” looking for synchronization
messages from the master radio.
In order for the radio to be controlled by Pin 4, the unit’s sleep mode must be
enabled through the
SLEEP [ON, OFF]
Sleep Mode Example
The following example describes Sleep Mode implementation in a typical
system. Using this information, you should be able to configure a system that
meets your own particular needs.
Suppose you need communications to each remote site only once per hour.
Program the RTU to raise an EIA/RS-232 line once each hour (DTR for
example) and wait for a poll and response before lowering it again. Connect
this line to Pin 4 of the radio’s
DATA
connector. This will allow each RTU to
be polled once per hour, with a significant savings in power consumption.
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