Communication module, MODBUS RTU and ASCII, Type 2, for E meter 7KT153 and 7KT154 The 7KT PAC measuring devices are the ideal basis for recording energy values. The 7KT PAC1500 measuring devices are used to measure energy consumption in single-phase and three-phase grids, for example in industrial plants, functional buildings, offices and apartments. The Siemens 7KT PAC1500 measuring devices provide suitable expansion modules for all communication tasks: 1. M-Bus expansion module (7KT1 908). 2. Modbus RTU expansion module (7KT1 907). 3. RS 485 expansion module (7KT1 903). 4. 7KNX/EIB expansion module (7KT1 900). 5. 7KT 1391 LAN coupler. www.siemens.com/power-monitoring. Siemens offers a comprehensive portfolio of protection, switching, measuring and monitoring devices, distribution boards as well as switches and sockets for safe and efficient electrical infrastructure in buildings and industry