A connection equipment connected to a field device via one of a plurality of terminal ports, the field device being controlled by a control system connected to the connection equipment, the connection equipment comprising: at least one transmitter/receiver configured to receive a first communication signal from the control system, the first communication signal comprising a field device reference of the field device; a memory configured to store a table for associating the field device reference of the field device with an identification of one of the plurality of terminal ports to which the field device is connected; a processor configured to determine a terminal port from among the plurality of terminal ports based on the field device reference included in the received first communication signal, and to instruct the at least one transmitter/receiver to transmit the received first communication signal to the field device via the determined terminal port; an electric power adjustor configured to adjust a level of an electric power signal to be provided to the field device via the determined terminal port based on an input level of an electric power signal received from the control system via a cable; and at least one isolator configured to transmit the electric power signal and the first communication signal via the determined terminal port, the at least one isolator comprising: a first isolation element configured to transmit the first communication signal from the at least one transmitter/receiver to the field device; and a second isolation element configured to transmit the electric power signal from the electric power adjustor. at least one transmitter/receiver configured to receive a first communication signal from the control system, the first communication signal comprising a field device reference of the field device; a memory configured to store a table for associating the field device reference of the field device with an identification of one of the plurality of terminal ports to which the field device is connected; a processor configured to determine a terminal port from among the plurality of terminal ports based on the field device reference included in the received first communication signal, and to instruct the at least one transmitter/receiver to transmit the received first communication signal to the field device via the determined terminal port; an electric power adjustor configured to adjust a level of an electric power signal to be provided to the field device via the determined terminal port based on an input level of an electric power signal received from the control system via a cable; and at least one isolator configured to transmit the electric power signal and the first communication signal via the determined terminal port, the at least one isolator comprising: a first isolation element configured to transmit the first communication signal from the at least one transmitter/receiver to the field device; and a second isolation element configured to transmit the electric power signal from the electric power adjustor. a first isolation element configured to transmit the first communication signal from the at least one transmitter/receiver to the field device; and a second isolation element configured to transmit the electric power signal from the electric power adjustor.