Dual Channel Inductive Vehicle Detector for Parking Entrance Exit Barrier Gate and Access Control Systems
Application Overview
This inductive vehicle detector is designed for controlled vehicle entrances and exits where two road loops manage the movement of cars, vans, trucks, and other vehicles. The unit monitors CH1 and CH2 in one dual-channel platform, converting loop activity into relay signals for connected barrier gates or access controllers.
In parking entrances, the first loop detects approaching vehicles while the second confirms passage. In exit lanes, the same concept supports exit direction logic. When loops are installed in sequence, the detector determines vehicle travel direction from CH1 to CH2 or CH2 to CH1.
With relay-based outputs, the detector integrates with compatible barrier controllers, parking control panels, and vehicle-access systems that accept dry-contact or relay-triggered inputs. The connected controller determines specific actions such as open, hold, count, or confirm passage.
Six Operating Modes
The detector offers six selectable modes via DIP-switch configuration:
- Direction-related pulse output
- Direction-related presence output
- Separate CH1 and CH2 presence operation
- Pulse output when vehicle enters a loop
- Pulse output after vehicle leaves a loop
This flexibility allows system integrators to use a single detector across various lane designs, from simple presence zones to direction-sensitive applications.
Detection Tuning
Each loop channel features eight sensitivity choices (0.015% to 0.8%) and four frequency selections across approximately 20-100kHz. These adjustments enable installers to optimize system performance for specific loop layouts and reduce interference from adjacent loops.
Core Features
- Two inductive loop channels in one detector
- Direction recognition from loop sequence
- Presence and pulse output options
- Independent channel operation capability
- Eight sensitivity settings for CH1 and CH2
- Four frequency selections
- Automatic reset and permanent presence modes
- Trailer sensitivity enhancement
- LED-assisted fault diagnosis
System Parameters
| Parameter |
Specification |
| Detection Method |
Inductive road loop |
| Channel Count |
Dual channel |
| Loop Terminals |
CH1 and CH2 |
| LD-200 Voltage |
100-240VAC |
| LD-202 Voltage |
12-24VAC/DC |
| Channel Sensitivity |
8 choices each |
| Sensitivity Values |
0.015% / 0.02% / 0.04% / 0.08% / 0.12% / 0.2% / 0.5% / 0.8% |
| Frequency Selection |
High / Medium-High / Medium-Low / Low |
| Frequency Span |
20-100kHz |
| Mode Selection |
6 DIP-switch modes |
| Directional Logic |
CH1→CH2 / CH2→CH1 |
| Relay Functions |
Presence / pulse depending on mode |
| Reset Behavior |
Permanent presence or approx. 10-min auto reset |
| Fault Status |
LED indication |
Access Control Applications
- Parking entrance control
- Parking exit control
- Residential gate lanes
- Commercial vehicle access
- Industrial site entrances
- Two-loop traffic direction logic
Commissioning Guidelines
Proper loop installation is essential for reliable inductive detection. The manual provides loop-turn recommendations based on loop perimeter and specifies vertical orientation for detector plug and socket installation.
Fault Diagnosis: If the detector indicates loop faults, check for open circuits, short circuits, and incorrect number of loop turns before adjusting frequency or rewiring.
Indicators and Status LEDs
- Power LED (RED): Illuminates to indicate "Power ON"
- CH1 Detection LED:
- Steady On: Vehicle detection
- Slow Blinking: Loop short circuit or insufficient twists
- Fast Blinking: Loop open circuit or excessive twists
- CH2 Detection LED:
- Steady On: Vehicle detection
- Slow Blinking: Loop short circuit or insufficient twists
- Fast Blinking: Loop open circuit or excessive twists
Sensitivity Selection
Sensitivity and frequency adjustment is facilitated through 7-way and 10-way dip switch settings:
- 8 different sensitivity settings available via dip switch configuration
- Dip switches 6, 7, and 8 govern CH1 sensitivity (0.8 to 0.015)
- Dip switches 3, 4, and 5 control CH2 sensitivity (0.8 to 0.015)
Switch Configuration
Switch 1 (S1) - Channel 1 Loop Function Selection:
- DIP 1 & DIP 2: Special Sensitivity Increase For Both Trailer (Both Channels)
- D3, D4, D5 and Switch 2 D1, D2: Special Functions (Mode1, 2, 3 Direction Detection. Mode 4, 5, 6 Normal mode)
- D6 & D7 & D8 and Switch 2 D3 & D4 & D5: CH1 and CH2 Sensitivity Selection (Eight Levels)
- D9 & D10 and Switch2 D6, D7: Frequency Selection (20 K to 100 KHz)
Reset Button Note: The LD-200 must be reset every time a setting change is made to the Dip switches.
Installation Guidelines
- Coil cutting size should be rectangle: length 1.0 to 2.0 meters, width 0.8 to 1.2 meters
- Avoid right angles at corners as much as possible
- Use ferromagnetic wires for induction coil, total length up to 500 meters
- Keep product plug and socket in vertical direction during installation
System Integration
The JUTAI LD200/202 double-channel vehicle loop detector series, equipped with direction recognition function, is ideal for single-channel entry and exit scenarios when integrated with:
- JUTAI One door controller (Model: AC-11)
- JUTAI gate barrier (Model: BR-110)
- JUTAI long-range RFID reader (Model: PUHF-9)
- High-temperature resistance loop coils (Model: JTHT-11)
Working Principle
Entry Process
- Car enters community/parking lot, pressing two loop coils simultaneously
- LD-200/202 triggers UHF reader at entrance
- UHF reader reads card ID and sends to controller via Wiegand output
- Controller verifies ID validity and outputs relay signal to open gate barrier
- Car enters, barrier arm lowers automatically
- LD-100/102 provides safety and anti-smashing functionality
Exit Process
- Car exits community/parking lot, passing inside UHF reader
- LD-200/LD-202 triggers UHF reader to read card and send ID to controller
- Controller verifies ID validity and outputs relay signal to open gate barrier
- Car exits, barrier arm lowers automatically
- LD-100/102 provides safety and anti-smashing functionality
Direction Recognition
The Direction Recognition Function ensures the double channels loop detector does not trigger the signal again when the car passes another UHF reader, recording only entry or exit records in the system.
Independent Operation Mode
The JUTAI LD-200/202 Double Channel Loop Detector can also function as two independent single-channel loop detectors, suitable for standard one-in and one-out parking lots. This configuration provides cost-saving benefits by reducing hardware costs associated with using separate detectors for each function.
