Operational Description

FCC ID: NTAXMETER6

Operational Description

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FCCID_324381

Tadiran Telematics Proprietary Rev V1 TMW – 25WB V1 March 31, 2003 Page 1 of 11

Tadiran Telematics Proprietary Table Of Content 1. INTRODUCTION .......................................................................................................................... 3 1.1. DEFINITIONS, ABBREVIATION AND ACRONYMS ........................................................................ 3 2. TMW DESCRIPTION ................................................................................................................... 4 2.1. BLOCK DIAGRAM ...................................................................................................................... 4 2.2. OPERATIONAL MODES............................................................................................................... 5 2.3. BOARD DIMENSION ................................................................................................................... 5 3. ELECTRICAL PERFORMANCE ............................................................................................... 6 3.1. TRANSMIT UNIT ........................................................................................................................ 6 3.1.1. Transmit Parameters ........................................................................................................ 6 3.1.2. Transmit Protocol............................................................................................................. 7 3.1.3. Tx Timing.......................................................................................................................... 8 3.2. RECEIVE UNIT ........................................................................................................................... 9 3.2.1. Receive Parameters .......................................................................................................... 9 3.2.2. Receive Protocol............................................................................................................. 10 3.3. ANTENNA ................................................................................................................................ 11 3.4. POWER SOURCE....................................................................................................................... 11 3.4.1. Operating Voltage .......................................................................................................... 11 3.4.2. Battery Life ..................................................................................................................... 11 3.5. ENVIRONMENTAL CONDITIONS ............................................................................................... 11 TMW – 25WB V1 March 31, 2003 Page 2 of 11

Tadiran Telematics Proprietary 1. Introduction The following document describes the technical specification of the Water Meter transceiver board with digital modulation (called TMW-TransMeter Water) for the USA market. The TMW is actually a water odometer, offering Automatic Meter Reading – AMR. The TMW is 2-Way RF communicator built-in water meter. The RF capabilities enable the transmission of the meter reading and some extra information to a Collecting unit. In addition specific parameters can be programmed via the RF link. The TMW consists of the following units: RF Transmitter & Receiver with integral Antenna that operate at 916.3 MHz and a Microcontroller (plus simple Digital Logic), which control the operational modes of the unit. 1.1. Definitions, Abbreviation and Acronyms RFD : RF Dialog TMW – 25WB V1 March 31, 2003 Page 3 of 11

Tadiran Telematics Proprietary 2. TMW Description 2.1. Block Diagram A block diagram of the TMW is described below. Battery 2.7 - 3.6V Rx Control TMW RF RxD Recceiver Antenna LO1 852.3 MHz 916.3MHz LO2 53.3 MHz Digital Micro Control Controller Logic 916.3MHz RF Transmitter TxD Tx Control Common x4 IO Reed Clock Clock Generator Generator 32768Hz 26.6353MHz 4 x Reed SW Figure 1: TMW Block Diagram TMW – 25WB V1 March 31, 2003 Page 4 of 11

Tadiran Telematics Proprietary 2.2. Operational Modes Mode Microcontroller Reed SW Digital RF RF Logic Receiver Transmitter Transmit On (fast clock) Disabled On Off On Receive On (fast clock) Disabled On On Off Reading Reeds SW On (fast clock) Enabled Off Off Off Idle/Sleep On (32768Hz clock) Disabled Off Off Off Notes: 1. When the Microcontroller reads the Reed SW it enables the Common_Reed signal. In this case, if the Reed SW is closed then the current via the Reed shall be ~6uA, otherwise the current shall be zero. 2. When the Reeds are disabled (Common_Reed = “0”), then the Reed current consumption is zero regardless of their state. 2.3. Board Dimension Figure 2: Board Dimension TMW – 25WB V1 March 31, 2003 Page 5 of 11

Tadiran Telematics Proprietary 3. Electrical Performance 3.1. Transmit Unit 3.1.1. Transmit Parameters Table 1 – Transmit Parameters Parameter Value Transmit Frequency 916.3 MHz Modulation Digital Modulation – Wide Band FSK Modulation Coding Manchester Bit rate (net data rate) 60 kbps Frequency deviation 190 kHz Frequency stability (including initial ±50 ppm stability, temperature and aging) Peak Output power (without Antenna) 14dBm Harmonics < - 54dBm Tx Pulse duration ~3.5ms Transmission rate Programmable. TMW – 25WB V1 March 31, 2003 Page 6 of 11

Tadiran Telematics Proprietary 3.1.2. Transmit Protocol Tx Frame 64 46 88 16 22 8 to 104 22 Extended Preamble Sync Application Data Packet CRC ECC Extended Data Packet ECC Length + Frame Unit ID Data Structure 8 48 32 Notes: 1. All numbers indicate number of bits 2. The preamble is alternating ones and zeros. The Preamble length is ~64 bits (at 120kbps). 3. When “Length + Frame Structure” field is all zero then the “Data Packet” field is used by the communication layer (Telematics) and not by the application layer. 4. If the “Application Data Packet” is less then 11 bytes then the communication layer shall fill this field to 11 bytes (88 bits). 5. CRC is used as an error detection code. It is calculated on the entire data packet. 6. ECC is used as an error correction code. The ECC is calculated on the Packet data + CRC. Figure 3: Transmit Frame TMW – 25WB V1 March 31, 2003 Page 7 of 11

Tadiran Telematics Proprietary 3.1.3. Tx Timing 3ms 3.5ms 1ms Synthesizer + XTAL On PA On Tx Data Preamble Tx Frame Figure 4: Transmit Timing TMW – 25WB V1 March 31, 2003 Page 8 of 11

Tadiran Telematics Proprietary 3.2. Receive Unit 3.2.1. Receive Parameters Table 2 – Receive Parameters Parameter Value Receive frequency 916.3 MHz Sensitivity (BER 1E-3) -87 dBm Modulation FSK Frequency deviation 190 kHz Bit rate 20 Kbps Coding Manchester TMW – 25WB V1 March 31, 2003 Page 9 of 11

Tadiran Telematics Proprietary 3.2.2. Receive Protocol 6 6 16 Up to 192 16 SYNC #0 SYNC #0 SYNC #0 SYNC #0 SYNC #1 Application Data Packet CRC Figure 5: Wake Up Sequence and Receive Frame Notes: 1. All numbers indicate number of bits 2. CRC is used as an error detection code. It is calculated on the entire data packet. TMW – 25WB V1 March 31, 2003 Page 10 of 11

Tadiran Telematics Proprietary 3.3. Antenna The TMW has an integral Antenna. The Antenna type is PIFA – Planar Inverted “F” Antenna. The Antenna is Omni Directional in horizontal plane. The max gain is 2dBi. The Antenna is made of brass/tin. 3.4. Power Source 3.4.1. Operating Voltage Battery rated voltage 3.6V. Operating voltage: 2.7-3.6V 3.4.2. Battery Life The battery life shall be at least 6 years 3.5. Environmental Conditions Operating Temperature: -10° C to + 70° C Storage Temperature: : -40° C to +85° C Humidity: Up to 95% TMW – 25WB V1 March 31, 2003 Page 11 of 11


Document Created: 2003-04-08 12:22:14
Document Modified: 2003-04-08 12:22:14
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