The Environmental Monitoring and Control (EMAC) Unit is a standalone unit in its own housing, based on the board-level EMAC Adapter but in any formfactor, that provides a compact, yet flexible solution for monitoring the health of a system's internal environment, including power supply voltages, temperatures, smoke detectors and cooling fan operation. Four open collector and eight digital output lines are also provided for the control of the monitored system.

Functions

Monitoring

• Power Supply Voltages

Up to six positive and two negative DC (Direct Current) voltages can be monitored via a 10-bit analogue-to-digital converter. The EMAC Unit is configured to monitor -12 V, +5 V, +12 V and +24 V by default, but can be modified to measure a wider range of DC voltages.

• Temperature

Up to eight DS18S20 or DS18B20 temperature sensors can be monitored at any time. Power to the sensors is supplied by the EMAC Unit.

• Fan Speed  

The rotation speed of up to eight cooling fans can be monitored at any time. The EMAC Unit is able to interface to +12 V (e.g. PAPST 4312S) and +24 V (e.g. PAPST 4314S) DC fans equipped with Pulse Width Modulated (PWM) outputs.

• Smoke Detectors

Two fused power outputs (+24 V) are provided to power eight smoke detectors which are monitored by the EMAC Unit. A +24 V signal from a smoke detector will be interpreted as an alarm while 0 V will indicate normal status.

Controlling

• Eight outputs to drive, for example, LEDs.

• Four open collector outputs can sink 24 V @ 2 A each to control, for example warning lamps and alarms or for other functions. The default configurations are :
   
• Power Warning  

When any one of the power modules exceeds the user-specified operating temperature.

• Temperature Warning  

When any one of the temperature sensors indicates temperatures outside the user-specified range.

• Voltage Warning  

When any one of the power modules operates outside the user-specified voltage limits.

• User Warning  

Any function can be implemented in firmware on request.

Features

• Available in either standard, PMC or custom formfactors, with either PCI or RS232 interfaces to host computer.
• Equipped with a Watchdog Timer to restart the EMAC Unit in case of software failure.
• The firmware is field upgradeable.  

Architecture

View a diagram of the EMAC Unit Architecture.

Environmental Monitoring and Control Unit Specifications

Environmental Specifications

Designations

S0012 Issue 1 Rev.1 2002-07-01
C²I² Systems (Pty) Ltd • P.O. Box 171 • Rondebosch 7701 • South Africa 
Telephone : (+27 21) 683 5490 • Facsimile : (+27 21) 683 5435 • WWW : www.ccii.co.za