The present invention discloses a method for sending data from a second agent to a first agent in a bus system having a host and at least two agents of the first agent and at least one second agent. The first and second agents are connected by an interrupt signal line externally provided to the bus system, and the second agent sends an interrupt signal to the second agent without the intervention of the host. The first agent having received the interrupt signal directly receives data stored in the second agent.
