Multi-site Energy Data Loggers with Embedded Web Servers

CARLO GAVAZZI has launched a new line of modular monitoring systems for energy management. VMU-C EM is a data logger system for small to medium projects, VMUC-Y EM is a hardware data aggregator for medium to larger projects and Em2 Server is a software solution for large projects. They are designed to complement the extensive line of Carlo Gavazzi energy maters and current transformers.



The 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 integrated web server, FTP, HTTP and Modbus/TCP data transfers. In addition to data management, the VMU-C EM platform can provide a relay output, SMS or email alarms and scalable pulse rate inputs. The VMU-C EM can function as a standalone data logging solution for applications with up to 32 meters or as a data gateway for larger installations.

The 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 the data from energy meters and environmental sensors, but it is also responsible for the management of collected data and web server function. Up to 10 VMU-C EM / 320 meters can be managed by single VMU-Y EM.

The Em2 Server is a software solution provided as a Virtual Machine software appliance to be hosted either in a customer’s facility or 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 EMloggers / 3,200 energy meters and provides web server function.


em79p3.jpg (31031 bytes)


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 analogue, 22 temperature and 11 pulse rate inputs
cUL listed product
em79p4.jpg (23566 bytes)

VMUY-EM Features:

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


em79p5.jpg (31777 bytes)

EM2 Server Features:


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



The VMU-C EM data logger system, VMUC-Y EM hardware data aggregator andEm2 Server are available from Carlo Gavazzi’s North American network of sales offices, distributors, and online at

For more information on these products and software, please click on any of the links below: