Miltel Communications SPEEDHPTX15-17 Transmitter for an automatic meter reading system User Manual 13 pages

Miltel Communications Ltd Transmitter for an automatic meter reading system 13 pages

13 pages

Speed HPTxWireless Data Linkfor Meter ReadingFCC ID: MLLSPEEDHPTX15-17User Manual
Miltel Communications Ltd. January 2001Table of ContentsChapter 1 Introduction................................................................................................ 41.1 Purpose and Use........................................................................................ 41.2 System General Description........................................................................ 4Chapter 2 Theory of Operation.................................................................................... 52.1 General Description.................................................................................... 52.2 Block Diagram Description.......................................................................... 72.2.1 General ...................................................................................................... 72.2.1 Digital Section ............................................................................................ 82.2.3 RF Section ................................................................................................. 9Chapter 3 Technical Characteristics...........................................................................103.1 Technical Specification ..............................................................................103.1.1 Electrical ...................................................................................................103.1.2 Physical.....................................................................................................103.2 Label Contents..........................................................................................11Chapter 4 Installation Instructions..............................................................................124.1 General .....................................................................................................124.2 Installation.................................................................................................12
NOTICEThis equipment has been tested and found to comply with the limits for aClass B digital device, pursuant to part 15 of the FCC Rules. These limitsare designed to provide reasonable protection against harmful interferencein a residential installation. This equipment generates, uses and can radiateradio frequency energy and, if not installed and used in accordance withthe instructions, may cause harmful interference to radio communications.However, there is no guarantee that interference will not occur in aparticular installation. If this equipment does cause harmful interference toradio or television reception, which can be determined by turning theequipment off and on, the user is encouraged to try to correct theinterference by one or more of the following measures:-Reorient or relocate the receiving antenna.-Increase the separation between the equipment and receiver.-Connect the equipment into an outlet on a circuit different from that towhich the receiver is connected.-Consult the dealer or an experienced radio/TV technician for help.
Chapter 1Introduction1.1 Purpose and UseThe Speed HPTx (FCC ID: MLLSPEEDHPTX15-17) is a data link transmitter that is usedfor data acquisition in Miltel’s water consumption readings collection system. Thisdevice is installed on-site by a professional field technician, thus it includes technicalterms. The equipment is not to be installed by a non-professional individual.1.2 System General DescriptionThe Speed HPTx system is a computerized fully automatic radio device. It requiresno human intervention after initial installation. The system enables remote,continuous and accurate reading of water consumption. The Speed HPTx transmitsthe data acquired from water meters to a regional. The concentrator transfers the datato the central computer for data collection and for further analysis and reporting.
Chapter 2Theory of Operation2.1 General DescriptionThe Speed HPTx 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 HPTx unit,connected to several meters (of various types) at a single location. The unit can beconnected to any type of meter which has a pulsed output (a passive magneticopen/short reed relay).The Speed HPTx acquires the consumption data from the water meters and storesthis data in its memory. The unit includes a miniature RF transmitter which transmitsdata on a periodic basis to a regional concentrator.
Figure 2-1: Speed HPTx Typical Installation2.2 Block Diagram Description2.2.1 GeneralFigure 2-2 describes the block diagram of the Speed HPTx unit. This device consistsof two major sections, all using a common power source:! Digital section (Micro Controller)! RF sectionTransmitter (SpeedClamp
A 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 HPTx Block DiagramMeter1MeternSensingandSupportCircuitryMicro-Controller RFTransmitterAntennaBatteryDevice EnclosureMagneticSwitchTamperSwitch
2.2.2 Digital SectionThe digital section of the Speed HPTx 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 storesinformation internal 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 HPTx to generate andtransmit an 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).
The 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 (tamperor low 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 20.0 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).
Chapter 3Technical Characteristics3.1 Technical Specification3.1.1 ElectricalMax Effective Radiated Power (ERP) 100 mw Peak (Complieswith FCC 90.205(d) )Output frequency 150-170 MHzCarrier wave modulation 2 Level FSKPower supply Lithium battery, 3.6 VoltInput Channels 1-10 Water MetersCompatibility Any type of meter which has a reed relayswitch (pulsed output)Transmission Duration 0.8 Sec. Max.Duration between Transmissions 30 Min.3.1.2 PhysicalOperating temperature -30÷+50°C or 2Water Resistance Splash resistance (IP-64)(IP 68-optimal)Length 11 cm.
Width 8 cm.Depth 3 cm.Weight (excluding clamp) 100 gr.Weight (including clamp) 500 gr.Clamp material Stainless steelClamp screws Protected from dismantling3.2 Label Contents (see file: Speed HPTx ID Label)FCC ID: MLLMLLSPEEDHPTX15-17Mode: Speed HPTxS/N: YY-nnnnnnMiltel Communications Ltd. Made in IsraelThis device complies with Part 15 of the FCC rules. Operation is subjected to thefollowing two conditions: (1) This device may not cause harmful interference, and(2) this device must accept any interference that may cause undesired operation. Figure 3-1: Label Design
Chapter 4Installation Instructions4.1 GeneralThe Speed HPTx 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 HPTx installation isperformed using a stainless steel clamp that enables connection to pipelines ofdifferent diameters (0.75", 1.00", 1.50" or 2.00").The Speed HPTx unit is protected so that it is impossible to open or dismantle thebox without breaking the four one-time screw locks.4.2 InstallationFor on-site installation of the Speed HPTx 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.b. 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 thePCB. Up to four such pairs can be connected, with unused connections leftopen (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 HPTx - Pipeline Installation

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