Description
This is an addendum to the Spread Spectrum Wireless Data Transceiver User Manual. It covers
details applicable specifically to using the FreeWave FGRIO Master and Slave modems. Please
use this addendum in conjunction with the User Manual.
The FreeWave Technologies FGRIO System provides outstanding performance and versatility
in wireless transmission of process-control signals. FGRIO offers “transparent” acquisition,
transport and reconstruction of analog, digital and power signals, eliminating the need for asso-
ciated buried wiring. The RTU requires no altered programming. The FGRIO is Class 1 Div 2
approved and is lower-cost and provides better signal integrity than vulnerable wiring.
The FGRIO System is based upon wireless RF Technologies. RF is subject to interference and
communication interruptions. It should not be expected, therefore, to provide 100% communi-
cation, 100% of the time. The FGRIO System should not be used without proper provisions to
ensure safety upon loss of radio communications.
Glossary
FGRIO Master
– FreeWave wireless radio transceiver that operates as a Master for up to 4
FGRIO or FGR2-IO Slaves, and can operate as a Slave in a point to multipoint network. The
FGRIO Master can receive over air a total of 4 analog input signals and 4 digital input signals
from up to 4 FGRIO or FGR2-IO Slaves. It can also transmit up to 4 digital output signals
over air to the FGRIO or FGR2-IO Slaves.
The FGRIO Master does not operate as a Slave/
Repeater in the SCADA system.
FGRIO Slave
– FreeWave wireless radio transceiver that accepts up to a total of 4 input signals
from sensors, then transmits these signals over air to the FGRIO Master. Two of the 4 available
input signals can only be transmitted as analog signals and are labeled as Analog Input 1 and
Analog Input 2 on the Slave’s terminal block. The other two input signals may be either analog
or digital inputs, depending on the user’s needs. The FGRIO Slave can also receive over air 2
digital output signals and a sensor power control signal from the FGRIO Master.
FGR2-IO Slave
– New generation FreeWave wireless radio transceiver that accepts up to a to-
tal of 4 input signals from sensors, then transmits these signals over air to the FGRIO Master.
Two of the available 4 input signals can only be transmitted as analog signals and are labeled as
Analog Input 1 and Analog Input 2 on the Slave’s terminal block. The other two input signals
may be either analog or digital inputs, depending on the user’s needs. The FGR2-IO Slave can
also receive over air 2 digital output signals and a sensor power control signal from the FGRIO
Master. The FGR2-IO has a line-of-sight range of 60 miles, compared to the 2 mile line-of-
sight range of the FGRIO Slave.
A note about terminology
: The phrase ‘FGRIO System’, when used in this manual, will refer
to any system that uses an FGRIO Master in conjunction with either FGRIO or FGR2-IO
Slaves. IO Slave will refer to either an FGRIO Slave or an FGR2-IO Slave.
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