Visibility Sensor Model

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Visibility Sensor Model JVS-1200A
Technical Description

Power Requirements

Power consumption is 0.12 Watts at +12 Volts DC, +/-20%, with an average current draw of about 10 milliamps for samples every 30 seconds. The microprocessor monitors the input +12 Volt power and internal temperature levels. If the input voltage dips below a programmed threshold level, or if internal temperature exceeds safe operating limits, the processor will set an alarm status bit output and enter into a low-power idle mode. Consumption is reduced by more than 50% of normal usage, during idle mode power. Total sensor functionality resumes when adequate power and/or safe temperature levels are restored.

Communications Protocols

Communication protocols are in binary format and are available to controller software developers upon execution of a Non-Disclosure Agreement at no charge. External interface electronics consist of four TTL, low true status lines (SYSOK, ALERT1. ALERT2, and ALERT3); one TTL, low true remote reset (REMRES\); and a three wire RS-232 serial communication channel.

Interface Requirements

The following is a description of the standard Visibility Sensor interface.

ALERTx: TTL Level Output Signals from Visibility Sensor

These signals go LOW (from 5 volts to 0 volts) when visibility is less than a programmable minimum threshold. They will stay LOW until visibility exceeds a programmable maximum threshold. These thresholds are programmable via the microprocessor firmware and filtered so that spurious and/or quickly changing transients in visibility do not produce false alarms.

Factory defaults:

ALERT1 sets to zero volts when visibility falls to 700 ft; alarm clears when visibility improves to 800 ft.

ALERT2 sets to zero volts when visibility falls to 500 ft; alarm clears when visibility improves to 600 ft.

ALERT3 sets to zero volts when visibility falls to 300 ft; alarm clears when visibility improves to 400 ft.

SYSOK: TTL Level Output Signal from Visibility Sensor

This signal goes LOW when the sensor controller determines that a serious fault condition exists which would prohibit normal operation. Such conditions include:

A. Temperature out-of-limits (below -25°C or above 50°C)
B. Sensor electronics fault C. Low battery voltage (<10.5 volts dc)

During the SYSOK\ state, the visibility sensor package will go to low power consumption "idle" mode until the fault condition is removed. Duration of "idle" mode is programmable. Factory default is 15 minutes.

REMRES\
TTL Level Input Signal to Visibility Sensor

This signal is normally HIGH. When pulled LOW momentarily, the sensor electronics are reset. If a temporary fault exists in the detector, the Call Box or interface electronics can issue a REMRES command that will reset the sensor electronics to normal operation. Patent Pending.

Visibility Sensor Main Page | Functional Description | Technical Description | Technical Data

Acoustic Respiration Monitor Sensor | Microwave Detector | Ultrasound Sensor | Visibility Sensor

For more information contact:
Steve Niederhaus or Peter Coakley at (858) 720-4078 or by e-mail sniederhaus@titan.com.


ATAG Home / LTL Technologies / Life Cycle Apps / Mine Detection Radar / RF Protection / Syst Survivability / Sensors

		Visibility Sensor Model JVS-1200A Technical Description
	Power Requirements Power consumption is 0.12 Watts at +12 Volts DC, +/-20%, with an average current draw of about 10 milliamps for samples every 30 seconds. The microprocessor monitors the input +12 Volt power and internal temperature levels. If the input voltage dips below a programmed threshold level, or if internal temperature exceeds safe operating limits, the processor will set an alarm status bit output and enter into a low-power idle mode. Consumption is reduced by more than 50% of normal usage, during idle mode power. Total sensor functionality resumes when adequate power and/or safe temperature levels are restored. Communications Protocols Communication protocols are in binary format and are available to controller software developers upon execution of a Non-Disclosure Agreement at no charge. External interface electronics consist of four TTL, low true status lines (SYSOK, ALERT1. ALERT2, and ALERT3); one TTL, low true remote reset (REMRES\); and a three wire RS-232 serial communication channel. Interface Requirements The following is a description of the standard Visibility Sensor interface. ALERTx: TTL Level Output Signals from Visibility Sensor These signals go LOW (from 5 volts to 0 volts) when visibility is less than a programmable minimum threshold. They will stay LOW until visibility exceeds a programmable maximum threshold. These thresholds are programmable via the microprocessor firmware and filtered so that spurious and/or quickly changing transients in visibility do not produce false alarms. Factory defaults: ALERT1 sets to zero volts when visibility falls to 700 ft; alarm clears when visibility improves to 800 ft. ALERT2 sets to zero volts when visibility falls to 500 ft; alarm clears when visibility improves to 600 ft. ALERT3 sets to zero volts when visibility falls to 300 ft; alarm clears when visibility improves to 400 ft. SYSOK: TTL Level Output Signal from Visibility Sensor This signal goes LOW when the sensor controller determines that a serious fault condition exists which would prohibit normal operation. Such conditions include: A. Temperature out-of-limits (below -25°C or above 50°C) B. Sensor electronics fault C. Low battery voltage (<10.5 volts dc) During the SYSOK\ state, the visibility sensor package will go to low power consumption "idle" mode until the fault condition is removed. Duration of "idle" mode is programmable. Factory default is 15 minutes. REMRES\ TTL Level Input Signal to Visibility Sensor This signal is normally HIGH. When pulled LOW momentarily, the sensor electronics are reset. If a temporary fault exists in the detector, the Call Box or interface electronics can issue a REMRES command that will reset the sensor electronics to normal operation. Patent Pending. Visibility Sensor Main Page \| Functional Description \| Technical Description \| Technical Data Acoustic Respiration Monitor Sensor \| Microwave Detector \| Ultrasound Sensor \| Visibility Sensor For more information contact: Steve Niederhaus or Peter Coakley at (858) 720-4078 or by e-mail sniederhaus@titan.com.