Disclosed herein are a controller device, a communication system and a
controlling method for transmitting commands for designating two modes used in
a setup comprising a controller device and a plurality of target devices reserved
by the controller device, the devices being interconnected by a data bus for transmitting
data in a predetermined communication format, one of the two modes allowing the
target devices to communicate with one another, the other mode inhibiting the reserved
target devices from thus communicating. Also disclosed are a communication system
and a controlling method for varying between such two modes a standby time that
must elapse before a command can be accepted following a bus reset, one mode permitting
communication between the reserved target devices, the other mode inhibiting such intercommunication.
