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L900 RSTAR Array Radio Series System
ELM0077I
RST Instruments Ltd.
Page 7
F
IGURE
3-3
C
ORRECT
A
NTENNA
O
RIENTATION
NOTE:
O
MNI ANTENNAS PROVIDED BY
RST
I
NSTRUMENTS WILL BE VERTICALLY
POLARIZED
.
A
NY NODE LOGGER ANTENNAS NOT ORIENTED IN THE SAME
DIRECTION WILL SUFFER A SIGNIFICANT SIGNAL PENALTY
.
•
Sealing the connections using Scotch® 130C Linerless Rubber Splicing Tape is
recommended, especially in cold or wet environments.
3.3.4
Assessing Radio Link Quality and Deployment
In the rare event of lost packets between RSTAR data loggers and an L900 RTU
HUB, RST has built-in software mechanisms that facilitate packet re-transmission for
robust communications.
Signal strength can be assessed in the field with an operational commissioned Hub
Logger when installing Node Loggers. The following instructions may also be used to
locate the optimal aiming of Yagi antennas.
1
Connect the Node Logger to the computer via USB.
2
Open the DT Logger Host software on the computer.
3
Locate the 'Connections' tab. Select 'Wireless Settings'. Select
‘RSTAR Settings’
4
Press 'Ping' to start a constant stream of signal quality requests from the RTU.
5
The RSSI recorded at the Node Logger (Logger) and Hub (Base) will be
displayed. The strongest signal measurable by the radio module is 40. Missed
transmissions will begin to occur past 65-70. A returned value of 0 indicates no
response packet was received.
6
Press 'Stop' to cease transmission once link quality has been optimized.
7
Press the 'Sync' button to update the Node Logger
’s clock, interval, and
transmission slot.