IP9TX400Personal Protection Transmitter

MINDA PERSONAL PROTECTION SYSTEM TX-400 KEY-FOB TRANSMITTER Operating Instruction Rev 1.0 June 2000 Tactical Technologies Inc. 1701 Second Ave Folsom, PA 19033 610-522-0106 www.tacticaltechnologies.com OVERVIEW Thank you for purchasing a MINDA TX-400 Transmitter, which uses a low-power microprocessor for ‘house-keeping’ and offers the following factory programmable options: • A Unit Identity Code (TX ID number 1,2,3,or 4) which will allow a single receiver to identify up to four different transmitters. • A very secure Family Identity Code, enabling secure use of multiple groups of transmitters and receivers together in the same location - without receiving alarms in ALL receivers. • Full compatibility with other MINDA equipment • Transmitter ‘Low Battery’ alert sent to receiver • Very low power consumption Keep this instruction manual in a safe place - it contains important information and helpf ul tips which will assist you to obtain the best possible performance from your new MINDA system. OPERATING FREQUENCY All MINDA systems for use in the United States operate on a frequency of 418MHz in the UHF band. The operating radio frequency cannot be changed to suit a specific customer’s needs. BATTERY INSTALLATION The MINDA TX-400 transmitter requires an internal 12 volt 33mA/hour battery type GP 23A (Duracell type MN-21). To install a new battery into a key-fob style transmitter, the two-piece case must be pried open by inserting and carefully twisting a flat-bladed screwdriver into the groove formed by the two case halves. The old battery can then be removed and replaced by a new one, taking care to ensure that it is orientated in accordance with the polarity markings on the inside of the case. The case top should then be carefully aligned with the LED and gently but firmly snapped closed just using finger pressure. OPERATION The TX-400 will only communicate with an appropriate MINDA receiver, such as the RX-400 pocket receiver, or the RX-500 portable/mobile/tabletop receiver. The TX-400 is operational immediately upon inserting the battery. The TX-400 has two buttons: RED and BLACK. The RED button sends a RED ALARM to a MINDA receiver. The BLACK button sends a GREEN alarm to a MINDA receiver. Press and hold either button for at least 1 second to transmit your alarm. The TX-500 has one RED LED. The red LED illuminates during transmissions. In use, if the red LED on the transmitter fails to light, or is lit dimly, the transmitter battery probably needs to be replaced. WHAT IS ACTUALLY TRANSMITTED Whenever a ‘MINDA’ transmitter operates, the actual digital data message transmitted contains all of the following pieces of information, repeated a number of times: < I am a ‘MINDA’ transmitter > and < My Family Identity is ‘xxx’ > and < I am Unit I.D. ‘y’> and < My alarm status is ‘red/green’ > and < My battery status is ‘OK/low’ > If the first two pieces of data in the above message exactly match the information programmed into the ‘MINDA’ receiver, then the rest of the information will be decoded and displayed on the receiver's LEDs. If they do not match, the entire message is ignored. UNIT IDENTITY A MINDA TX-400 Keyfob Transmitter can have one of four possible Unit Identities (1, 2, 3 or 4) pre-programmed by the factory. The user can not alter the pre-programmed Unit Identity Code (show n on the label on the back of the case) whenever required. Note : Check that you know the Unit Identity (1,2,3,or 4) of the transmitter that you intend to use by sending a test signal to a ‘MINDA’ receiver and noting w hich of its LEDs illuminates. ANTENNA The transmitter's antenna is the external small black cord. Never attempt to shorten, fold up or modify the transmitter antenna since such action will seriously degrade the range of the MINDA system. When using the key-fob transmitter, hold the case so that the short cord antenna points away from you, and then press the appropriate button for at least one second. The small red LED should illuminate. FAMILY IDENTITY CODE Each MINDA system, when supplied to a customer, will have already been programmed at time of manufacture with a common default ‘Family Identity Code’ (hexadecimal 94) enabling it to be used with any other of the standard MINDA products. The Family Identity Code for a particular family of MINDA units can easily be re-programmed by returning all of the equipment to Tactical Technologies Inc. The TX-400 transmitter can by programmed with any one of a possible 255 Family Identity Codes. For a MINDA system to operate with, and recognize up to four independent transmitters, the Family Identity Code of the receiver and transmitter(s) all have to match AND each of the transmitters must have a different Unit Identity (1,2,3 or 4). A microprocessor controlled MINDA receiver will only respond to signals from those transmitters sending the same Family Identity Code that it has been pre-programmed to accept. This capability minimizes the risk of interference between similar systems that happen to be operating within radio range of one another. It is absolutely vital therefore, to ensure that all transmitter and receiver units that have to operate together are programmed with the same Family Identity Code. Signals received from any ‘alien’ transmitter operating within range will not be decoded and, instead, treated by the receiver as radio interference on the channel. LOW BATTERY WARNING When the battery voltage of a MINDA TX-400 transmitter drops to a level where battery replacement is desirable, each subsequent transmission made will be ‘tagged’ to indicate this fact to the receiving end. When a MINDA receiver recognizes a ‘tagged’ signal from a MINDA transmitter, the LED indicator appropriate to that transmitter’s Unit Identity will start to ‘blink out’ briefly about once per second. BATTERY LIFE The TX-400, when equipped with a fresh battery, should operate for more than 5000 activations of the transmitter. TRANSMISSION RANGE When using the MINDA syste…

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FCC ID IP9 TX400 TX 400 OPERATIONAL CIRCUIT DESCRIPTION This basic key-fob transmitter comprises a small PCB on which there is a Holtec HT-12E encoder IC, a red LED, a Radiometrix TXM-418 UHF saw oscillator transmitter module operating at 418 MHz, and a few other discrete components. Power is provided by a 12B 33mA battery fitted into clips attached to the PCB. On pressing SW1 or SW2, power is provided for the encoder and the TXM-418 module via reverse polarity protection diodes D1 and D2. Clock rate for the encoder is determined by R3 and the encoder data output frequency modulates the transmitter via the Data IN pin of the TXM module. The RF output of the TXM module drives the 1/4 wave whip antenna. A low battery warning is indicated by Data Bit 3 going high when the battery voltage falls below the sum of the LED forward voltage (D5), the zener diode voltage (D6) and Q1 emitter base forward voltage (approx. 7.5V) and thus fails to turn on Q1. At this point the LED transmit indicator will only be faintly illuminated but the transmitter will continue to function. Both the address and the data pins of the encoder are pulled up to the supply by weak internal pull-up resistors. The transmitter is coded by closing the DIP switches (SW3) to match the appropriate MINDA 'Family Code' (01-99 Hex, 255 possible). The unit identity is set during manufacture by fitting or omitting R1 or LK1 (see schematic). For reliable operation the address should not be set to either all 'low' or all 'high' as 'pha nto m'; messages ma y ca use false decoder operation.