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 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.
PRODUCT NO.
OKA-450T
OPERATION
LOCK
UNLOCK
TRUNK
ACTION
LOCK THE DOOR
UNLOCK THE DOOR
UNLOCK THE TRUNK
Transmitter
f = 433.92MHz
User's manual (provisionally)
◎REMOTE TRANSMITTER
LOCK
UNLOCK
TRUNK
You can lock and unlock your vehicle with the remote transmitter.
LOCK
When you push the 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 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.
TRUNK
When you push the TAIL GATE button for 1.0sec, It will unlock.
Attention
For use only with battery PANASONIC Battery corporation etc., Lithium cell (CR2032)
Specificati
1 CPU
Type uPD78F0567-xxx(8bit)
ROM 8 Kbytes
RAM 128 bytes
EEPROM 32 bytes
Clock frequency -
Clock frequency generation RESONATOR OSCILATION
Package 20pin SSOP
2 RF block
Carrer frequency 433.92MHz
Manufacturer : RENESAS Corporation
Frequency generation X-TAL
Modulation FSK
Bit transmission rate 2Kbps or 1Kbps
Bandwidth ±40KHz
RF output power (field strength ≤10mW (e.r.p.)
3 OthersOthers
Dimension 71.7mm(H) x 39.2mm(W) x 18.05mm(T)
Weigh 54.5 g
Battery Lithium cell (CR2032)
Operation Voltage DC3V
Operation Temperature -20℃∼+60℃
Manufacturer : PANASONIC Battery corporation etc.
Features
1 Transmission frame
The transmission begins immediately in case of LOCK and UNLOCK and TRUNK button is pressed.
The transmission frame consists of the synchronous frame and the data frame.
The synchronous frame has 320bit 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 4bit function code
and 8bit crc 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 300 milliseconds.
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.
Marking label
RF Keyless Entry System
Model Number : OKA- 450T
Transmitter: 3 V
Omron Automotive Electronic Korea
FCC Part 15.19
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.
FCC Part 15.21
Any changes or modifications (including the antennas) to this device that are not
expressly approved by the manufacturer may void the user’s authority to operate the
equipment.
This device complies with Industry Canada licence-exempt RSS standard(s).
Operation is subject to the following two conditions:
(1) this device may not cause interference, and
(2) this device must accept any interference, including interference that may cause
undesired operation of the device.
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux
appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions
suivantes :
(1) l'appareil ne doit pas produire de brouillage, et
(2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même
si le brouillage est susceptible d'en compromettre le fonctionnement.
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