MDS 05-2708A01, Rev. F
MDS TransNET Ref. Manual
39
For a Remote radio, under normal operation, RSSI is based on the average
signal strength of the SYNC message received in each of the eight frequency
zones. (RSSI is sampled each time a SYNC message is received.) When using
the RSSI reading to align a directional antenna, it is important to make
changes slowly so that the RSSI reading will provide meaningful results. It
will take several seconds to indicate a change in signal level. The radio stays
in RSSI mode until
is pressed.
For a Master radio, under normal operation, entering the RSSI command
causes the response
NOT AVAILABLE
to be returned. This is because a Master
is normally receiving signals from several Remote stations and an RSSI
reading would be continually changing. The only exception is when the
SETUP
command has been asserted. This disables hopping and allows
reading a “raw” RSSI signal level in real time from a Master or Remote radio.
NOTE 1:
RSSI readings will not accurately indicate signals stronger than –40 dBm.
NOTE 2:
RSSI works for Dependent Masters. Command displays “NOT AVAILABLE” if
the Dependent Master is not synchronized.
RTU [ON, OFF, 0-80]
Remote Terminal Unit Simulator
This command re-enables or disables the radio’s internal RTU simulator,
which runs with GE MDS proprietary polling programs (poll.exe and
rsim.exe). The internal RTU simulator is available whenever a radio has diag-
nostics enabled. This command also sets the RTU address to which the radio
will respond.
The internal RTU can be used for testing system payload data or pseudo bit
error rate (BER) testing. It can be helpful in isolating a problem to either the
external RTU or the radio. The default RTU setting is
OFF
. To use this
command in a polling environment for testing, refer to the
Network-wide
Diagnostics Systems Handbook
(P/N: 05-3467A01).
RX [xxxx]
Radio Receive Test Frequency
This command sets or displays the test receive frequency used in place of
hopping when the radio is in
SETUP
mode. The test receive frequency can be
reprogrammed to any value between 902.200 MHz and 927.800 MHz, inclu-
sive. The factory default setting is 915.000 MHz.
For the 2400 MHz radios, the test frequency can be programmed to any
frequency between 2400.6 MHz and 2482.0 MHz. The default value is
2436.0 MHz.
RXD [0–255]
RXD Delay
Used to set a delay, in milliseconds, of RXD data to emulate a seamless mode
with much lower latency in applications where retries are not required. Use a
delay of twice the value of the
HOPTIME
period (See
ENTER
