IEC TS 60870-5-604:2016(E) is available as IEC TS 60870-5-604:2016 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC TS 60870-5-604:2016(E) 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. This new edition includes the following significant technical changes with respect to the previous edition:
- resolution of ambiguities,
- refinement of some test cases to enhance operability between tested devices,
- addition of some test cases (mainly negative test cases).