If wanting to use an external power supply for the Laptop, first connect the serial cable and then the power supply cable.
Connecting the other way round could be dangerous, because the power supply unit for the laptop normally contains an autotransformer, and the difference of ground potential could damage the serial port of the PC and (or) the serial interface of the
IDU
Connect the serial cable between the Serial/Alarm interface (positioned on the Controller
unit) and the Serial port of Computer.
About Author: Abd Aziz Mohamad
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