3 results about "Modbus" patented technology

The invention relates to a low-voltage electrical appliance communication protocol adapter which comprises double single chips, double Modbus-RTU protocol converting circuits, a Profibus-DP, a DeviceNet protocol converting circuit, an off chip data memory, an LCD (liquid crystal display) screen and a keyboard, wherein on chip universal asynchronous receiver-transmitters of the double single chips are respectively connected with the Modbus-RTU and an RS485 level converting transceiver circuit; an on chip control local area network is respectively connected with double DeviceNet converting transceiver circuits to finish acquiring low-voltage electrical appliance data and responding to bus commands and events; meanwhile, I2C communication modules of the single chips are connected with the off chip data memory based on I2C to finish storing the data and extracting processed low-voltage electrical appliance parameters. Due to the adoption of double processor operations and a caching technology, technical schemes such as response time, and the like when other adapters are operated are reduced so as to ensure that the low-voltage electrical appliance communication protocol adapter becomes a centralized controller, a small network server and an adapter. The adapter can hang at most three buses, thereby increasing the adaptability of low-voltage electrical appliances during networking and facilitating users mounting.

The invention discloses an integrated monitoring system for a power station steam turbine electric hydraulic control system based on a Modbus protocol, which relates to an automatic control system for generating station unit equipment and particularly relates to a Modbus protocol-based power station equipment DCS (Distributed Control System) integrated monitoring system. The system of the invention is composed of a steam turbine electric hydraulic control system, a unit DCS control system and a data communication network, wherein the data communication network comprises an EHCS (Electric Hydraulic Control System)-side communication interface station and a DCS-side communication interface card; the EHCS-side communication interface station is interconnected with the DCS-side communication interface card via a serial converter. Data communication is realized through the Modbus protocol, the unit DCS control system executes a monitoring operation process on the steam turbine electric hydraulic control system through an operator station, monitoring and operation on all important parameters and equipment of the steam turbine electric hydraulic control system are completed, the training workload and the maintenance workload of an operator can be greatly reduced, and the technical problems of not high information and data sharing degree between the power station steam turbine electric hydraulic control system and the unit DCS control system which are mutually independent and have different regulations and low system integration degree can be solved.

The invention relates to the technical field of intelligent camera communication protocol security, and discloses an intelligent camera, which comprises camera equipment CDsssd which runs deep packet inspection system server software and serves as Modbus slave equipment, and the camera equipment CDsssd is in communication connection with a remote client RCcmd through an industrial Ethernet and by adopting a Modbus/TCP protocol. Deep packet inspection system client software runs on the remote client RCcmd, and the remote client RCcmd is used as a Modbus main device; the deep packet detection system comprises an identity legality detection module, a protocol integrity detection module and a function code use security detection module. The camera equipment CDsssd authenticates whether the communication authority of the remote client RCcmd is legal or not through the identity legality detection module. According to the invention, the technical problem that an attacker will counterfeit a remote client RCcmd as a Modbus master device to maliciously access a camera device CDssd as a Modbus slave device due to the lack of a corresponding identity authentication mechanism in a Modbus/TCP communication process is solved.