Description method of substation communication protocol conformance test model based on EFSM

As two conformance test standards on substation communication protocol,IEC 60870-5- 6 and the tenth part of IEC 61850 have formally issued,the conformance test model describing communication protocol becomes the key in the development of conformance test tools. Through the analysis of conformance testing text of substation communication protocol and FSM(Finite State Machine),a description method of substation communication protocol conformance test model based on EFSM(Extended Finite State Machine) is defined and proposed,which focuses on each event in the interchange of information and avoids the complexity of flowchart description. With the general classification serviceRead directory of a single entry of IEC 60870-5-103 as an example,the comparison of modeling method between EFSM and flowchart illustrates the conciseness and preciseness of EFSM method.