Miltel Communications SPEEDTX433L1 Low Power Meter Reading Transmitter User Manual Transmitter

Miltel Communications Ltd Low Power Meter Reading Transmitter Transmitter

Transmitter User Manual

Speed Tx User ManualMiltel Communications Ltd. 1Speed TxLow Power Wireless Data LinkFCC ID: SPEEDTx433L1User ManualMiltel Communications Ltd. June 1998
Speed Tx User ManualMiltel Communications Ltd. 2Table of ContentsChapter 1 Introduction...................................................................................................31.1 Purpose and Use............................................................................................31.2 System General Description ...........................................................................3Chapter 2 Theory of Operation .....................................................................................42.1 General Description ........................................................................................42.2 Block Diagram Description..............................................................................62.2.1 General...........................................................................................................62.2.1 Digital Section.................................................................................................72.2.3 RF Section ......................................................................................................8Chapter 3 Technical Characteristics............................................................................93.1 Technical Specification ...................................................................................93.1.1 Electrical .........................................................................................................93.1.2 Physical...........................................................................................................93.2 Label Contents..............................................................................................10Chapter 4 Installation Instructions .............................................................................114.1 General.........................................................................................................114.2 Installation.....................................................................................................11
Speed Tx User ManualMiltel Communications Ltd. 3Chapter 1Introduction1.1 Purpose and UseThe Speed Tx (FCC ID: SPEEDTx433L1) is a low-power data link transmitter that isused for data acquisition in Miltel’s water consumption readings collection system.This device is installed on-site by a professional field technician, thus it includestechnical terms. The equipment is not to be installed by a non-professional individual.The information in this manual is provided only as instructions for installation anddoes not entitle user to make any modifications or adjustments.1.2 System General DescriptionThe Speed Tx system is a computerized fully automatic radio device. It requires nohuman intervention after initial installation. The system enables remote, continuousand accurate reading of water consumption. The Speed Tx transmits the dataacquired from water meters to a regional concentrator (directly or via a repeater). Theconcentrator transfers the data to the central computer for data collection and forfurther analysis and reporting.Note: 1) The system, including transmitters, transceivers and concentrators, isinstalled and maintained only by qualified professional technicians. 2) The device is not adjustable by user and is supplied by manufacturerready for installation witout provisions for adjustmant.
Speed Tx User ManualMiltel Communications Ltd. 4Chapter 2Theory of Operation2.1 General DescriptionThe Speed Tx is the first link in the water readings collection system. It is anindependent unit that does not require an external power source, wiring, or thepreparation of an infrastructure.The unit is installed in proximity to the water meter/s and is connected to severaladjacent meters.Figure 2-1 (see next page) shows a typical installation of a Speed Tx unit, connectedto several meters (of various types) at a single location. The unit can be connected toany type of meter which has a pulsed output (a passive magnetic open/short reedrelay).The Speed Tx acquires the consumption data from the water meters and stores thisdata in its memory. The unit includes a miniature low-power RF transmitter whichtransmits data on a periodic basis to a regional concentrator (directly or through arelay station).
Speed Tx User ManualMiltel Communications Ltd. 5 Figure 2-1: Speed Tx Typical InstallationTransmitter (Speed Tx)Clamp
Speed Tx User ManualMiltel Communications Ltd. 62.2 Block Diagram Description2.2.1 GeneralFigure 2-2 describes the block diagram of the Speed Tx unit. This device consists oftwo major sections, all using a common power source: Digital section (Micro Controller) RF sectionA 3.6 volts Lithium battery provides power to all parts of the device. The powersupply for the RF section is controlled via the Tx switch (not shown), thus cutting ofpower to the transmitter unless necessary for actual data transmission (standby mode). Figure 2-2: Speed Tx Block DiagramMeter1MeternSensingandSupportCircuitryMicro-ControllerRFTransmitterAntennaBatteryDevice EnclosureMagneticSwitch TamperSwitch
Speed Tx User ManualMiltel Communications Ltd. 72.2.2 Digital SectionThe digital section of the Speed Tx performs the following functions: Samples reed switches to detect short/open from each meter. Accumulates number of pulses for each meter separately Stores data (including battery and tamper alarms) and stores informationinternal memory Interfaces the data to the RF sectionThe digital section is based on a central controller which accepts the following inputs:a. Analog inputs (from reed-relay contacts) designated INPUT1 through INPUTn,each indicating the advance of a single water meter. These are the only inputsof the controller which are connected to the external source.b. Magnetic switch input is utilized only for test.c. The TAMPER SWITCH input is connected to a micro-switch that senses anopening of the unit's box. This enables the Speed Tx to generate and transmitan alarm signal in the event of unauthorized opening of the unit casing.d. The LOW VOLTAGE input of the controller is connected to battery via a LowVoltage Detector in order to sense and generate a low battery alarm.Each of the external analog inputs to the controller advances a separate counter insingular steps. The counters in the controller are not pre-settable or resettable toavoid unauthorized tampering (counter matching is thus performed only by the centralcomputer, ensuring excellent data security at the sites).
Speed Tx User ManualMiltel Communications Ltd. 8The controller gathers the data for several hours before initiating a transmission. Ifany of the counters has advanced by more than a preset value, or any alarm (tamper orlow voltage) has been received, the controller generates a single messageimmediately. Any further message will include alarm information along with counterdata, if alarm condition still exists. Note: The duration interval between twotransmissions is always greater than 1 Hr.a. The messages generated by the controller are 16 bytes each, and are outputedfrom the digital section to the RF section as serial data (RS-232 standardprotocol) via the DATA OUT output of the controller.b. The Tx control output of the controller is used for activating the TX switch forthe duration of the message, to enable power supply to the RF section thusenabling the transmission of the message (transmit mode).2.2.3 RF SectionThe RF section consists of a phased-locked loop (PLL) and a low-power amplifierconnected to an integral antenna.The PLL reference is driven by a 13.56 MHz. crystal oscillator. This reference isphase-compared by the Phase Detector with the divided output frequency. The phase detection signal from the detector is filtered by the PLL Loop Filter andthen summed with the shaped signal received from the digital section by the SumNetwork block. The output of the Sum Network is the control signal that modulatesand locks the Voltage Control Oscillator (VCO).
Speed Tx User ManualMiltel Communications Ltd. 9Chapter 3Technical Characteristics3.1 Technical Specification3.1.1 ElectricalMax Effective Radiated Power (ERP) 1.4 µW Peak (Complies with FCC 15.231(e) )Output frequency 433.92 MHzCarrier wave modulation 2 Level FSKPower supply Lithium battery, 3.6 VoltInput Channels 1-8 Water MetersCompatibility Any type of meter which has a reed relay switch(pulsed output)Transmission Duration 0.8 Sec. Max.Duration betweenTransmissions1 Hr. Min.3.1.2 PhysicalOperating temperature -10÷+60°CWater Resistance Splash resistance (IP-64)
Speed Tx User ManualMiltel Communications Ltd. 10Length 11 cm.Width 8 cm.Depth 3 cm.Weight (excluding clamp) 200 gr.Weight (including clamp) 500 gr.Clamp material stainless steelClamp screws protected from dismantling3.2 Label Contents (see file: Speed_Tx ID Label)FCC ID: MLLSPEEDTx433L1Model: Speed Tx_433_L1S/N: YY-nnnnnnMiltel Communications Ltd. Made in IsraelThis device complies with Part 15 of the FCC rules. Operation is subjected tothe following two conditions: (1) This device may not cause harmfulinterference, and (2) this device must accept any interference that may causeundesired operation. Figure 3-1: Label Design
Chapter 4Installation Instructions4.1 GeneralThe Speed Tx is installed by a professional technician. Several possibilities forinstallation have been programmed into the system in order to provide solutions forinstallation of various types of water meters. The Speed Tx installation is performedusing a stainless steel clamp that enables connection to pipelines of differentdiameters (0.75", 1.00", 1.50" or 2.00").The Speed Tx unit is protected so that it is impossible to open or dismantle the boxwithout breaking the four one-time screw locks.4.2 InstallationFor on-site installation of the Speed Tx device, proceed as follows:1) Loosen the four screws fastening the unit's box and open the box cover.2) Install the unit's box base as required:a. For pipeline installations (as in Figure 2-1), first attach the stainless steelclamp (see Figure 4-1) to the pipeline, close it around the pipeline andfasten the screw in the middle of the device. Place the unit's box base ontop of the screw and install it using two steel screws.
Speed Tx User ManualMiltel Communications Ltd. 12b. For wall mounting of the unit, install the base directly onto the wall orsurface using the two steel screws.3) Connect the wire pairs from the water meters to the terminal blocks on the PCB.Up to four such pairs can be connected, with unused connections left open (i.e.,no termination is required).NoteConnect each pair of wires to the respective terminals; note theconnections for future reference.4) Close the unit's box cover.5) Perform functional radio test by touching box corner with strong magnet(trigger transmission). Verify correct reception of data at base station(concentrator). Update water actual readings for the respective meter.6) Close the four screws fastening the cover.7) Insert plastic protection plugs.Figure 4-1: Speed Tx - Pipeline Installation

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