This line of modular monitoring systems for energy management includes specific loggers for small to large projects.

For small to medium projects: VMU-C EM is a combination of hardware modules, whose primary function is to collect data from a network of energy meters and environmental sensors and then make this data available to end users utilizing industry-standard methods, such as an integrated web server,  FTP, HTTP, and Modbus/TCP data transfers.

For medium to larger projects: VMU-Y EM is a data aggregator that is built upon the VMU-C EM hardware platform, with a primary function of aggregating data from a network of VMU-C EM data loggers in applications where support for more than 32 energy meters is required. The VMU-Y EM relies on VMU-C EM data loggers to collect data from energy meters and environmental sensors, but it is also responsible for the management of collected data and web server functions. Up to 10 VMU-C EM / 320 meters can be managed by a single VMU-Y EM.

For large projects, the Em2 Server is a software solution provided as a Virtual Machine software appliance to be hosted either in a customer's facility or on a remote server. Similar to the VMU-Y EM, the Em2 Server relies on the VMU-C EM for communication with energy meters. It aggregates data in large applications with up to 100 VMU-C EM loggers / 3,200 energy meters and provides web server function. 

VMU-C EM Features:   

• Data logger for energy meters, environmental sensors, and rate pulses
• Web server function & data transfer (FTP, HTTP, Modbus/TCP slave)
• RS-485 and Ethernet communication with meters
• USB ports for communication and backup
• Micro SD card port for data backup
• Data management of electrical variables from up to 32 energy meters
• Support for most Carlo Gavazzi meters
• Support for non-Carlo Gavazzi meters with open Modbus tool
• Option for up to 33 dual I/O modules
• Option for up to 11 analog, 22 temperature and 11 pulse rate inputs
• cUL listed product

VMUY-EM Features:

• Data aggregator for up to 10 VMU-C EM
• Web server and web services functions
• USB ports for communication and backup
• Micro SD card port
• cUL listed product

EM2 Server Features:

• Software solution based on VMware technology
• Data aggregator for up to 100 VMUC-EM
• Web server and web services functions
• Linux 64 bit operating system
• Enterprise-level database engine
• DVD distribution