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G8D-584M-B1
Receiver, RF Keyless Entry System
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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 vehicle
door and anti-theft protection using wireless remote controller. This system consists of two
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 intermitt
ently 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
UNLOCK
TRUNK
PANIC Vehicle is disarming will be start sounding the horn and flushing the hazard lamp intermittently
lock the door
unlock the door
open the trunk
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2. User’s manual (provisionally)
REMOTE TRANSMITTER
You can lock and unlock and anti-theft protection 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 in the ignition switch.
UNLOCK
When you push the UNLOCK button, all the doors will unlock.
If you unlock the doors with the remote transmitter, but do not open any of the doors
within 30 seconds, the doors will automatically relock.
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 TRUNK buttons, open the trunk.
PANIC (anti-theft protection)
When you push the PANIC button, when the vehicle disarming. Then start sounding the
horn and flushing the hazard lamp intermittently. It continues 3 minutes unless pressing any
remote control switch.
△ CAUTION
The remote control switch is a precision electronic device. Therefore pay attention to the
following:
Do not impose shock on the remote control switch.
Keep the remote control switch dry.
Do not disassemble the remote control switch.
When the remote control switch is opened, keep water, dust, etc, off its inside. In
addition,
do not touch the precision electronic device.
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ANT
3. Block diagram
RECEIVER
CIRCUIT
313.85MHz
figure 3.1 block diagram of the receiver
data
input
8BIT
5MHz
POWER
EEPROM
output
DRIVE
12V (car battery)
DOORLOCK
Signal of vehicle status
FILTER
RF‑OSC RF‑AMP BP
LOCAL‑OSC
LP
FILTER
LOW‑Freq.
AMP
COMPA‑
RATOR
CPU
figure 3.2 block diagram （receiver Circuit）
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4. Specification
4.1 CPU
Type
ROM
RAM
Clock frequency 5MHz
Clock frequency generation Crystal resonator
Package 30pinSSOP
μPD789104(8bit)
Manufacturer: NEC Corporation
8192×8 bit
256×4 bit
4.2 EEPROM
Type S-93C46ADFJ
Manufacturer : Seiko Elec.
Memory 1kbit
Package 8pin SOP
4.3 RF Receiver Module
Type G8D-21RX
Manufacturer : IAM Elec.
Local clock frequency 313.85MHz
Frequency generation Crystal resonator
Modulation Scheme FM
Carrier Detect Sensitivity
５dBuVemf
4.3 Others
Dimension
Weight 45g
Battery Car Battery (DC 12V)
Operation Voltage , Current DC 12V, 10mA
Operation temperature
60mm×62mm×25mm
-30℃ ~ +80℃
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5. Features
5.1 Door lock control
The receiver sends “LOCK” signal to door-lock controller when LOCK button of transmitter was pressed. The
receiver also sends “UNLOCK” signal to door-lock controller when UNLOCK button of transmitter was pressed.
These facility doesn’t work if the key is inserted the key cylinder or the door is open.
5.2 Automatic locking
The receiver sends “LOCK” signal to door-lock controller if the door has not opened within 30 seconds after
UNLOCK button of transmitter was pressed. This facility helps accidental pressing the UNLOCK button such as
the transmitter is a pocket.
5.3 Battery saving
Because of the power source of the receiver is car battery, it is very important problem to minimize a power
consumption. The receiver‘s CPU works intermittently to prevent the battery exhaustion.
5.4 Receiver exercise software
The normal transmission operation of the receiver is conducted by a battery which is installed within a vehicle.
For the measurements purpose a regulated DC power supply is used instead the battery of the vehicle. The
reception of the receiver was conducted by operating intermittently a transmitter with the lock condition. There
is no difference between the lock and unlock condition regarding the electrical and mechanical functions of
a receiver. Also there is no deference between both conditions regarding the frequency of radiated emission.
The only difference is the reception time. The following is no explain the difference:
a) A receiver received the transmission code from a transmitter when the receiver is the “ON” condition.
b) The “ON” condition of the receiver continues until the reception of the transmission code shall complete.
c) After the reception of the transmission code shall complete, a door lock actuator shall operate.
Waiting
Codition
120msec 10msec
Receive
Conditon
Waiting condition after Receive finished
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△
! CAUTION
The remote control switch is a precision electronic device. Therefore, pay attention to the following:
･ Do not impose shock on the remote control switch.
･ Keep the remote control switch dry.
･ Do not disassemble the remote control switch.
Your keyless entry system operates on a radio frequency subject to Federal Communications
Commission (FCC) rules and Industry Canada rules.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following tow
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 of the device.
“Complies with RSS-210 of Industry Canada.”
NOTICE
This equipment has been tested and found to comply with the limits for a Class B device, pursuant to
part 15 of the FCC Rules, These limits are designed to provide reasonable protection against harmful
interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used
in accordance with the instruction, may cause harmful interference to radio communications However
there is no guarantee that interference will not occur in particular installation. If this equipment dose
cause harmful interference to radio or radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the interference 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 to which the receiver is connected
−Consult the dealer or an experienced radio/TV technician for help.
FCC WARNING
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
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