EPI

The data logger includes two RJ45 module jacks labeled EPI. Ethernet Peripheral Interface (EPI) is a proprietary interface for communications between Campbell Scientific data loggers and Campbell Distributed Modules (CDMs) such as the GRANITE-Series peripheral devices and smart sensors. EPI expands the functionality or channel count of the GRANITE 9/10. This communications connection satisfies the tight timing requirements imposed on independent GRANITE Measurement Modules that are working together as part of a measurement and control system.

The underlying communications of EPI are built using TCP/IP. More specifically, the IEEE 1588 protocol is implemented at the lowest hardware levels for synchronization of device clocks across the entire network. This accomplishes tighter device synchronization and 100-times the data throughput of CPI. The additional power, cost, and complexity are warranted for fast sampling applications.