3-4
3.2 CPU Module 
The main element of the IRRInet-XL RTU is the CPU Module (see Figure  3-2). The CPU 
controls the I/O Modules, processes the data gathered, and communicates with external 
devices. The CPU module is based on the Motorola 68LC302 microprocessor and 
includes on-board memory, communication circuits, I/O bus drivers, and other circuits. 
The CPU Module is installed in the second slot from the left in the multi-slot I/O card cage. 
 
Figure  3-2 CPU Module – Front Panel