SINEAX DME 440 is a programmable multi-transducer with a RS 485 bus interface (MODBUS®). It supervises several variables of an electrical power system simultaneously and generates 4 proportional analogue output signals. The RS 485 interface enables the user to determine the number of variables to be supervised (up to the maximum available). The levels of all internal energy meters that have been configured (max. 4) can also viewed. Provision is made for programming the SINEAX DME 440 via the bus. A standard EIA 485 interface can be used, but there is no dummy load resistor for the bus. The transducers are also equipped with an RS 232 serial interface to which a PC with the corresponding software can be connected for programming or accessing and executing useful ancillary func- tions. This interface is needed for bus operation to configure the device address, the Baud rate and possibly increasing the telegram waiting time (if the master is too slow) defined in the MODBUS® protocol. The usual methods of connection, the types of measured variables, their ratings, the transfer characteristic for each output and the type of internal energy meter are the main parameters that can be programmed. The ancillary functions include a power system check, provision for displaying the measured values, data storage, system fault diagnosis, serial communication, and external device connection.
