NOVATEK ELECTRO . ET-485

ET-485 is an ARM Cortex based converter unit designed to provide data exchange between the equipments connected to Ethernet 10BASE-T and 100BASE-T network and the equipments supplied with RS-485 interface and forming Modbus network. The examples of network topology with application of RS-485 are shown in pics. The unit fulfills the functions of a Modbus Server for switching the Modbus clients to the Ethernet network and vise versa. In the RS-485 master mode, the unit redirects Modbus queries from the clients in Ethernet network to the devices in Modbus network and returns the answers from the devices to the clients. In the query redirection to remote server mode, the unit maintains the connection to Modbus TCP server in Ethernet network and in addition directs client queries to this server. In the RS-485 slave mode, the unit in addition accepts RS-485 queries from a Modbus-client within Modbus network. Et-485 has following special features: - flexible addressing within the Ethernet network (overloading MAC-address, static and dynamic IP-address); - different data transfer modes for Modbus network (RTU and ASCII with/without odd-even check, wide range of transmission speeds, selectable delay; - adjustable redirection of queries; - security access (IP address filtration and/or access password for condition reading, for setting the unit, for connection to Modbus network, and for recording/reading within Modbus network). ET-485 meets the following requirements: Information processing equipment Safety Part 1 General requirements (IEC 60950-1:2001). Technology equipment. Radio disturbance characteristics limits and methods of measurement (CISPR 22:2006). Voltage to maintain normal operation: - alternating current 100 - 250 V - direct current 140 – 350 V; Supply frequency: Hz 47 – 63; Supported Ethernet protocols: Modbus TCP, HTTP; Maximum number of connections over the Modbus TCP protocol:11; Integrated servers: Modbus-server, HTTP-server.