DUAL VEHICLE LOOP DETECTOR WITH

RS485 COMMUNICATIONS

The LD220 is a dual channel inductive loop detector. The use of microprocessor based technology enables a large number of functions to be incorporated into a small package. All configuration is carried out over the RS485 communication network.

Typical applications include safety loops, arming loops and entry or exit loops.

Standard features of the detector are :

· RS485 Communications Port.

The RS485 communications port enables up to 127 detectors to be networked on a single twisted pair cable. The LD220 communicates using the Modbus protocol in Binary mode. All configuration data is held in modbus registers and can be setup by a PC or PLC on the network.

· Switch selectable Sensitivity.

Sensitivity settings are available.

· Pulse Relay Selection.

The detect relay may be configured for a pulse output, and to energise on detection of a vehicle or when the vehicle leaves the loop.

· Selectable N/O or N/C relay output.

Internal jumpers enable the output relay contacts to be configured for normally open or normally closed contacts.

· Direction Logic

This feature enables the detector to give a pulse output on relay1 for a vehicle traveling from loop1 to loop2 and a pulse output on relay 2 for a vehicle traveling from loop2 to loop1.

· Selectable Extend Time.

When switched on this feature extends the output.

· Loop Fault Indicator.

This LED Indicator is illuminated when the loop is either open circuit or short circuit and is used to give a visual indication of a faulty loop.

TECHNICAL DATA

1. POWER REQUIREMENT:

2. PRESENCE/PULSE RELAY : 0.5A/220VAC.

3. INDICATOR: LED indicator which shows state of loop detector.

4. DETECTOR TUNING RANGE: 15 - 1500 uH.

5. PROTECTION: Loop isolation transformer with zener diode and MOV.

6. CONNECTOR: 11 Pin Connector on rear of unit.

7. DIMENSIONS: 85mm (HIGH) X 40mm (WIDE) X 79mm (DEEP)

8. OPERATING TEMPERATURE: -40°C to +80°C

9. STORAGE TEMPERATURE: -40°C to +85°C

10. HUMIDITY: up to 95% non condensing

11. Complies with EMC Directive 89/336/EEC and Low Voltage Equipment Directive 73/23/EEC.