Industry jargon

Modbus

Modbus is an application-layer messaging protocol used for client/server communication between industrial devices. It is widely used with meters, inverters, battery systems and site controllers because the data model is simple and well established. Modbus can run over serial links or TCP/IP. In an EV charging site, a power controller might use Modbus to read a meter or coordinate with a BESS while using OCPP separately for charger-to-CSMS communication. Modbus does not define what an EV charger should do with a site measurement. The register map, control logic and integration behaviour still need to be specified by the equipment manufacturer or system integrator.