A TTFields (tumor-treating fields) therapy field generator, comprising: an AC voltage generator; a first serial data transceiver; a first memory; and a single, first connector having a first plurality of pins for outputting an AC voltage generated by the AC voltage generator, and a second plurality of pins for conveying serial data to and from the first serial data transceiver; characterized by: a first controller programmed to execute instructions that cause the field generator to perform the following steps: determining if a transducer interface has been connected to the first connector, after determining that the transducer interface has been connected to the first connector, activating the AC voltage generator so that an AC voltage appears across the first plurality of pins of the first connector, and storing data relating to TTFields treatment in the first memory, determining if a data transfer apparatus has been connected to the first connector, and after determining that a data transfer apparatus has been connected to the first connector, retrieving the data related to TTFields treatment from the first memory and routing the retrieved data to the first serial data transceiver so that the first serial data transceiver outputs the data relating to TTFields treatment via the second plurality of pins of the first connector. an AC voltage generator; a first serial data transceiver; a first memory; and a single, first connector having a first plurality of pins for outputting an AC voltage generated by the AC voltage generator, and a second plurality of pins for conveying serial data to and from the first serial data transceiver; characterized by: a first controller programmed to execute instructions that cause the field generator to perform the following steps: determining if a transducer interface has been connected to the first connector, after determining that the transducer interface has been connected to the first connector, activating the AC voltage generator so that an AC voltage appears across the first plurality of pins of the first connector, and storing data relating to TTFields treatment in the first memory, determining if a data transfer apparatus has been connected to the first connector, and after determining that a data transfer apparatus has been connected to the first connector, retrieving the data related to TTFields treatment from the first memory and routing the retrieved data to the first serial data transceiver so that the first serial data transceiver outputs the data relating to TTFields treatment via the second plurality of pins of the first connector. determining if a transducer interface has been connected to the first connector, after determining that the transducer interface has been connected to the first connector, activating the AC voltage generator so that an AC voltage appears across the first plurality of pins of the first connector, and storing data relating to TTFields treatment in the first memory, determining if a data transfer apparatus has been connected to the first connector, and after determining that a data transfer apparatus has been connected to the first connector, retrieving the data related to TTFields treatment from the first memory and routing the retrieved data to the first serial data transceiver so that the first serial data transceiver outputs the data relating to TTFields treatment via the second plurality of pins of the first connector.