NETWORK CONTROLLER

PURPOSE:To expand the use and service of a data collector, by switching terminal charging and center charging based on external charging form information, and selecting the charging form in accordance with the purpose of data communication. CONSTITUTION:When a terminal device 3 sends a calling request signal to a network controller 5, a circuit monitoring circuit 13 monitors the use state of a telephone circuit 1 and after a calling acceptance signal is transmitted, an automatic dialing circuit 11 receives selective dial information and charging form information from the device 3 and sends out a dial signal corresponding to the selective dial information. When the charging information shows a terminal charging form, the circuit 13 detects polarity inversion and when an automatic termination network control circuit 8 receives a center answer signal, the circuit 11 activates a code transmitting circuit 9, thereby holding data communication is held in readiness. When the charging information shows a center charging form, the circuit 8 receives a center answer signal while the circuit 13 does not detect polarity inversion, and then the circuit 11 activates the circuit 9, holding the data communication is held in readiness.