This text introduces two graded 485 network system structure with industrial control computer,AT89S52 and μPSD3251F, and explains characteristic functions of the system. And then it introduces communication protocols and flow charts of industrial control computer & μPSD3251 and μPSD3251 & AT89S52.At last it gives serial communication initialized program of μPSD3251F and AT89S52.;
Network communication adopt Modbus communication agreement. Network connector,cable and repeater install constructing according to PROFIBUS bus requirement. Systematic RS485 network connects with PC main station through RS232/485 converter.
In this method,on the basis of RS232 serial communication agreement,API function of VC++6.0 and assemble language are used in the serial communication system,and the data collection is realized of single chip computer and serial communication between PC and single chip computer.
Meanwhile, we present a Virtual Interface Storage Architecture (VISA) as a new network storage architecture which uses vSCSI as the network communication protocol.
CCPA: Component-Based Communication Protocol Architecture for embedded systems
We present the Component-Based Communication Protocol Architecture (CCPA) to make communication dynamic and configurable.
Its software is a communication protocol between the central control computer and the entrance management base station.
After analyzing the protocol levels used in SAS based on embedded Ethernet and the differences between the TCP and UDP, UDP/IP is selected as the communication protocol between the station-level and bay-level devices for its real-time characteristic.