Omron Automotive Electronics Korea OKA-240T RF Keyless Entry System (Transmitter) User Manual

Omron Automotive Electronics Korea Co., Ltd. RF Keyless Entry System (Transmitter) Users Manual

Users Manual

OMRON AUTOMOTIVE ELECTRONICS KOREA OKA-240T Transmitter, RF Keyless Entry System
Table of contents 1. Constitution of the Radio Frequency Keyless Entry system Controller for vehicle ................................................................................................................. 1 2. User's manual (provisionally) ............................................................................... 2 3. Block diagram ........................................................................................................... 3 4. Specification ............................................................................................................... 4 5. Features ...................................................................................................................... 5 This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation.Caution: Any changes or modifications to the equipment not expressly approved by the party responsible for compliance could void user's authority to operate the equipment.
1. Constitution of the Radio Frequency Keyless Entry System for vehicle The radio frequency keyless entry is a system that it controls locking and unlocking the door and the trunk by wireless remote controller. This system consists of three components. The TRANSMITTER is a device that transmits the signal when the button is pressed. The transmission signal consists of several synchronous codes , unique identification code , security code and function code. The RECEIVER is fixed inside the vehicle. It works intermittently to prevent the battery exhaustion. When the receiver detects the synchronous code, it runs continuously to receive the signals completely. After receiving the signal, the receiver decides which operation will be performed. The user can select the following operations by pressing the button of the remote transmitter. OPERATION ACTION LOCK lock the door UNLOCK unlock the door PANIC alarm the horn Transmitter f = 307.9MHz - 1 -
2. User's manual (provisionally) REMOTE TRANSMITTER You can lock and unlock your vehicle with the remote transmitter. LOCK When you push the LOCK button, all the doors will lock. You cannot lock any of the doors with the remote transmitter if any door is open or the key is the ignition switch.UNLOCK When you push the UNLOCK button, all the doors will unlock. You cannot unlock any of the doors with the remote transmitter if any door is open or the key is in the ignition switch. PANIC When you push the PANIC button, horn will alarm. - 2 - UNLOCKLOCKPANICUNLOCKLOCKPANIC
3. Block diagram This is block diagram concerning to the transmitter LOCK UNLCOK 8BIT CPU PANIC TRANSMISSION EEPROM RF CIRCUIT SAW Resonator 308 MHz CRYSTAL 4.19 MHz figure 3.1 block diagram of the transmitter - 3 -
4. Specification4.1 CPU Type ROM RAM EEPROM Clock frequency Clock frequency generation Package uPD789860-xxx(8bit) Manufacturer : NEC Corporation 4 Kbytes 128 bytes 32 bytes 4.19MHz CRYSTAL Osillation 20pin SSOP4.2 RF block Carrer frequency Frequency generation Modulation Bit transmission rate Bandwidth RF output power (field strength) 307.9MHz SAW Resonator FSK 1000bps or 500bps 100KHz 5000μ V/m at 3m 4.3 Others Dimension Weigh Battery Operation Voltage Operation Temperature 56mm×35mm×11mm 22.4g Lithium cell (CR2032) Manufacturer : PANASONIC Battery corporation etc. DC 3V -20℃˜+60℃ - 4 -
5.Features 5.1 Transmission frame The transmission begins immediately in case of LOCK and UNLOCK and PANIC button is pressed. The transmission frame consists of the synchronous frame and the data frame. The synchronous frame has 30 synchronous codes that it will be used for the receiver to wake up. The data frame consists of 24bit length identification code, 16bit security code and function code. 16million different identification codes are available. The security code is always changed in case of any of the buttons is pressed. The transmission time is typically 640 milliseconds.5.2 Battery saving To prevent the battery exhaustion , the micro-computer of the transmitter is usually inactive. When the button will be pressed, the micro-computer wakes up immediately and judges which button is pressing. Then the micro-computer constructs the transmission frame and radiates it from the antenna .After transmitting , the micro-computer switches stand-by mode by itself. - 5 -

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