RTEX A REAL TIME EXECUTIVE FOR DCCS

This paper presents the design idea and implementation of a real time multiprocess executivededicated to a distributed computer control system(abbreviated as DCCS),RTEX.The hostprecessor is an INTEL 8344 microcontroller proper for mini size industrial control work station.A real time executive is designed to provide a friendly environment for users to develop their ownapplied software.In consideration of reliability and ease of maintenance the executive is imple-mented by a hierarchical structure with eight layers which include user applied programs,net-work communication,real time clock manager,interprocess communication,processcoordination,process manager,memory manager,hardware.For practical purpose the networkcommunication software is implemented by four layers,namely physical,datalink,transport andapplication.The bottom two layers are designed according to the Bit Bus protocol,so that thework station is compatible with the INTEL distributed system.Three parts,the kernel,networkcommunication and facilities for system initialization and applied software development are in-cluded.

RTEX A REAL TIME EXECUTIVE FOR DCCS

This paper presents the design idea and implementation of a real time multiprocess executive dedicated to a distributed computer control system(abbreviated as DCCS),RTEX.The host precessor is an INTEL 8344 microcontroller proper for mini size industrial control work station. A real time executive is designed to provide a friendly environment for users to develop their own applied software.In consideration of reliability and ease of maintenance the executive is imple- mented by a hierarchical structure with eight layers which include user applied programs,net- work communication,real time clock manager,interprocess communication,process coordination,process manager,memory manager,hardware.For practical purpose the network communication software is implemented by four layers,namely physical,datalink,transport and application.The bottom two layers are designed according to the Bit Bus protocol,so that the work station is compatible with the INTEL distributed system.Three parts,the kernel,network communication and facilities for system initialization and applied software development are in- cluded.