Connection to the CTT

For this purpose, the IUT shall support either:

• the DLMS/COSEM 3-layer, connection-oriented HDLC based communication profile (Mode E or direct HDLC mode); or
• the TCP/IP based communication profile.

The IUT may be connected directly or via a suitable modem. The connection shall be established before starting the test.

Testing of IUTs implementing other communication profiles is possible by using a suitable modem or via a test interface of the IUT supporting one of the profiles listed above.