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1.
ALL DIGITAL INPUTS, ANALOG INPUTS, ANALOG OUTPUTS, AND MEASUREMENTS OF THE DATAFLOW RTU ARE
REFERENCED TO GROUND. DO NOT USE THE DATAFLOW RTU WITH EQUIPMENT THAT REQUIRES COMPLETE
ISOLATION.
2.
ALL DATAFLOW RTU DIGITAL OUTPUTS ARE ISOLATED LATCHING RELAYS. DO NOT EXCEED CONTACT RATINGS
OF THESE RELAYS.
3.
EXCITATION VOLTAGE AND LOAD DRIVE VARY FROM MANUFACTURER TO MANUFACTURER. CONSULT THE
MANUFACTURER DOCUMENTATION BEFORE CONNECTING THE SENSORS OR INDICATORS TO THE DATAFLOW
RTU.
4.
DATAFLOW RTU CASE IS CONNECTED TO GROUND.
5.
DATAFLOW RTU SYSTEMS REQUIRE AN FCC LICENSE. PRIOR TO OPERATION CONTACT RITRON FOR LICENSING
INFORMATION.
6.
THE FREQUENCY DEVIATION IS CONTROLLED BY VARIABLE RESISTOR R131. THIS DEVIATION ADJUSTMENT
SHOULD ONLY BE PERFORMED BY AUTHORIZED RITRON PERSONNEL USING THE APPROPRIATE METHODS AND
TEST EQUIPMENT.
7.
DO NOT SHORT THE RED WIRE (PIN 6) OF CONNECTOR J105 TO GROUND.
8.
DO NOT SHORT THE RED WIRE (PIN 5) OF CONNECTOR J101 TO GROUND.
9.
IF AN INTERNAL BATTERY IS INSTALLED DO NOT SHORT THE ORANGE WIRE (PIN 7) OF CONNECTOR J105 TO
GROUND. PERFORMING ANY OF THESE ACTIONS WILL DESTROY THE FUSE (F101) LOCATED ON THE DATAFLOW
RTU CONTROL BOARD.
DO NOT OPERATE THE DATAFLOW RTU WITHOUT AN ANTENNA OR SUITABLE LOAD.
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4.1
The DATAFLOW RTU from RITRON is a complete wireless telemetry system designed to deliver
industrial instrumentation signals from a source to other instruments via radio frequency communications.
The DATAFLOW RTU allows you to access industrial measuring devices in remote locations without
running wires, installing microwave links or leasing a telephone line. RITRON DATAFLOW RTU and
MODBUS radio communications equipment replaces these methods.
4.2
This manual is intended to provide information needed for the installation and operation of RITRON
DATAFLOW RTU systems. The intended readers are people familiar with industrial instrumentation. A basic
understanding of radio communications is helpful.
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5.1
DATAFLOW RTU is a radio telemetry system that operates on either UHF-FM (450-470 MHz with a
transmitter power of 2 Watts or 5 Watts) or VHF-FM (150 to 165 MHz, 136 to 151 MHz and 160 to 174 MHz
with a transmitter power of 5 Watts). An RTU system operating in the UHF-FM band at 2 Watts with
directional antennas and 50-foot towers has an effective range of 20 to 25 miles over level terrain. Changes
in the frequency of operation, transmitter power, terrain and antenna structure will affect the range of the
link.
TO DO SO MAY DAMAGE THE
3
TRANSMITTER.
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