Further Enhancements of the Front-End-Electronics Communication Software

The FeeCom chain consists of three layers: the FedClient as dedicated DIM module in the PVSS on the supervisory layer, the ICL located on the control layer and the FeeServers connected to the Front-End-Electronics (FEE) operating on the field devices. The ICL acts as distributor and collector for the system. It distributes commands issued from the supervisory layer to the FeeServers running on the field layer and collects their data and answers before relaying them further to the PVSS. Preparation of command data inside the ICL is achieved via access to the Configuration Database and detector-specific CommandCoders (CoCo) of the respective detectors. Data exchange is performed over well defined APIs (Application Programmers Interface; FEDAPI (Front-End-Device-API), FEE-API, CoCo-API) [1] [2]. Data transport between the different layers employs Distributed Information Management (DIM) as the underlying protocol [3].