User’s Manual Page 3
6.2 Enable pin.
The card must be provided with a 5VDC signal to enable operation. This feature has been added
to externally control the status of the outputs. An external switch or a Safety Charge Pump can
be added to provide the enabling signal. When the enable signal is not present, output signals
sent high impedance state. If this function is not required, a jumper can be placed between +5vdc
and the EN terminal. It has an internal 4.7kOhm pull-down resistor
7.0 LED INDICATOR
The power LED lights to indicate that the system is ready but disabled. When Status
LED, (Green LED) lights, it indicates that the system is enabled.
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