GE DS3820CDAA Bus expansion module

In ROM versions earlier than 1.96, the Nova II does not recognize when a sensor has been disconnected. Therefore, when changing sensors, the meter should be turned off; the new sensor plugged in; and then the Nova II should be turned on again. From ROM version 1.96, this is no longer necessary, as the Nova II will recognize when a sensor has been disconnected and will restart itself. See section 3.6.6 for details

Smart Connectors 

The Nova II meter is versatile and can operate with either thermal, pyroelectric or photodiode type laser measuring sensors. The sensor configuration and calibration information is stored in an EEROM in the sensor connector plug. This means that when the sensor is plugged in, the Nova II automatically identifies the sensor type, calibration and configuration. The user does not have to adjust anything.

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