Monitoring the dark noise of photomultiplier tubes (PMT) is important for maintaining the operation of the Borexino detector. For this purpose, a dark noise monitoring system was developed on the basis of the CAN network and the DeviceNet upper-level protocol. The system consists of a set of CAN controllers, which digitize PMT signals and transmit data over the CAN to the host computer. The software creates a DeviceNet protocol stack, ensuring data collection and transmission. The user interface is built on the basis of dynamic WEB pages.
$^1$Institute of Nuclear Physics, Moscow State University, Leninskie gory, Moscow, 119992, Russia
$^2$Russian Research Center “Kurchatov Institute,”, Moscow, 123182, Russia
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