Abstract: A bus coupler for coupling field devices to a superordinate bus system includes an impedance converter arranged in a series circuit with a terminating resistor between a signal input and a field device output to enable a comprehensive diagnosis option separately for each transmission line and the connected field device, wherein the terminating resistor assumes the function of a line terminating resistor and a current limitation, and where a controllable reference voltage source enables the maximum output current to be defined and the output shut off.

Abstract: A bus coupler for coupling field devices to a superordinate bus system includes an impedance converter arranged in a series circuit with a terminating resistor between a signal input and a field device output to enable a comprehensive diagnosis option separately for each transmission line and the connected field device, wherein the terminating resistor assumes the function of a line terminating resistor and a current limitation, and where a controllable reference voltage source enables the maximum output current to be defined and the output shut off.

Abstract: A connecting apparatus for connection of field devices comprising a bus connection for connection to a bus, a field device connection for connection for a field device, a power supply path and a signal path, wherein the power supply path and the signal path are arranged in parallel with one another between the bus connection and the field device connection such that a supply voltage carried on the bus is isolated from a signal, which is likewise carried on the bus, by a first coupling unit arranged in the power supply path and a second coupling unit arranged in the signal path.

Abstract: A connecting apparatus for field devices in an explosion-hazard zone, comprising an input terminal area for a first connecting line, an output terminal area for a second connecting line, a covering device for protecting at least one of the terminal areas, a first switching element for passing an electric current from the input terminal area to the output terminal area, a control unit for controlling the first switching element, a first sensor device that detects opening of the covering device, where the first sensor device is connected to the control unit and the control unit is configured to operate the first switching element.

Abstract: A connecting apparatus for connection of field devices comprising a bus connection for connection to a bus, a field device connection for connection for a field device, a power supply path and a signal path, wherein the power supply path and the signal path are arranged in parallel with one another between the bus connection and the field device connection such that a supply voltage carried on the bus is isolated from a signal, which is likewise carried on the bus, by a first coupling unit arranged in the power supply path and a second coupling unit arranged in the signal path.