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Control Interface Unit (CIU)
CIU is a control unit that handles all interactions with the operator.
It communicates with the engine via two serial com- munication buses. J1939 is used for control and moni- toring of the engine. J1587 is used for diagnostics and backup.
The CIU unit reads in the status of a number of switches as well as the engine speed request and for- wards them to the engine. It also controls the four an- alog instruments and up to nine
warning lamps. By using the diagnostic button and a diagnostic lamp, the driver can read off fault codes from the system.