NAiS FP2 - Confirming the I;O Contacts and Slot Number; The Role of Input;Output Contacts

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2.4 Confirming the I/O Contacts and Slot Number
2.4.1
The Role of Input/Output Contacts.
Multi Communication Unit (MCU) has input/output contacts which enable communication with the CPU
unit. (They are mainly used in the general-purpose serial communication.)
These contacts play various roles, such as alerting the CPU unit when sending and reception have been
completed, alerting when an error has occurred, or resetting the port of MCU.
The contacts are turned on and off from the CPU unit, which also controls the timing of serial
communication being carried out by the MCU.