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.
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.
Up to eight DS18S20 or DS18B20 temperature sensors can be monitored at any time. Power to the sensors is supplied by the EMAC Unit.
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.
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.
When any one of the power modules exceeds the user-specified operating temperature.
When any one of the temperature sensors indicates temperatures outside the user-specified range.
When any one of the power modules operates outside the user-specified voltage limits.
Any function can be implemented in firmware on request.
View a diagram of the EMAC Unit Architecture.
Environmental Monitoring and Control Unit Specifications
S0012 Issue 1 Rev.1 2002-07-01