This part of IEC 60870@ which is a technical specification@ describes test cases for conformance testing of telecontrol equipment@ Substation Automation Systems (SAS) and telecontrol systems@ including front-end functions of SCADA@ using the IEC 60870-5-104 companion standard and IEC 60870-5-6@ Guidelines for conformance testing for the IEC 60870-5 companion standards. The use of this part of IEC 60870 facilitates interoperability by providing a standard method of testing protocol implementations@ but it does not guarantee interoperability of devices. It is expected that using this specification during testing will minimize the risk of noninteroperability. The goal of this part of IEC 60870 is to enable unambiguous and standardised evaluation of IEC 60870-5 companion standard protocol implementations. The guidelines and conditions for the testing environment are described in IEC 60870-5-6. The detailed test cases per companion standard@ containing among others mandatory and optional mandatory test cases per Basic Application Function@ ASDU and transmission procedure@ will become available as a technical specification. Other functionality may need additional test cases but this is outside the scope of this part of IEC 60870. For proper testing@ it is recommended to define these additional test cases. This document is such a Technical Specification for the mentioned companion standard. This part of IEC 60870 deals mainly with communication conformance testing; therefore other requirements@ such as safety or EMC are not covered. These requirements are covered by other standards (if applicable) and the proof of compliance for these topics is done according to these standards.