User's Manual

MDS 05-2708A01, Rev. A MDS TransNET I/O Guide 31
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—every 1.6
seconds.) 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: RSSI Readings are not accurate for incoming signals stronger than
–50 dBm.)
RTU [ON/OFF/0-80]
This command re-enables or disables the radio’s internal RTU simulator,
which runs with MDS’ proprietary polling programs (poll.exe and rsim.exe).
The internal RTU simulator is available whenever a radio has diagnostics
enabled. This command also sets the RTU address that the radio will respond
to.
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.
RX [xxxx]
This command sets or displays the test receive frequency used in place of
hopping whenever the radio is in Setup mode. The test receive frequency can
be reprogrammed to any value between 927.975 MHz and 902.025 MHz
(MDS TransNET 900™), inclusive. The factory default settings are listed
below and have been selected to be non-intrusive to normal operation.
RXTOT [NONE, 0–1440]
This command sets or displays the amount of time (in minutes) to wait for the
next received data packet before issuing a receiver time-out alarm. The default
is NONE.
SEND [n, -n, +n]
The SEND command selects or displays the number of times that a radio will
re-transmit data. This command is associated with “robust” or “bulletproof”
operation of the radio and is intended for use in areas with heavy radio
interference.
Default Receive Frequencies
Master Remote
MDS
TransNET
900

927.975 MHz 902.025 MHz
ENTER