MDS 05-3316A01, Rev. E
MDS 4710B/9710B I/O Guide
7
6. Refine the antenna heading of the station to maximize the received
signal strength (RSSI) from the master station.
Use the
RSSI
command from an HHT connected to the radio’s
DIAG-
NOSTICS
connector.—See TRANSCEIVER PROGRAMMING on
page 15. This can also be done with a DC voltmeter as described in
3.3 RSSI Chart
2.2 Using the Radio’s Sleep Mode
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 Sleep Mode. In this mode, power
consumption is reduced to less than 16 milliamperes.
Sleep mode can be enabled under RTU control by asserting a ground (or
RS-232 low) on Pin 12 of the radio’s
DATA INTERFACE
connector.
When Pin 12 is opened (or an RS-232 high is asserted), the radio will be
ready to receive data within 75 milliseconds.
All normal functions are suspended while the radio is in sleep mode. The
PWR
LED will be off.
System Example
The following example describes Sleep Mode implementation in a typ-
ical system. Using this information, you should be able to configure a
system that will meet your own particular needs.
Example:
Suppose you need communications to each remote site only
once per hour. Program the RTU to raise an 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 12 of the
radio’s
DATA INTERFACE
connector. This will allow each RTU to
be polled once per hour with a significant savings in power con-
sumption.
