Ink jet printer and ink jet head

An ink jet head, comprising:

• a nozzle in fluid communication with an ink chamber;
• an actuator configured to change a volume of the ink chamber to eject ink via the nozzle;
• a connector at which a signal line from an ink jet head control circuit can be connected to supply a control signal and register setting data;
• a driver circuit connected to the signal line and configured to generate a drive waveform for driving the actuator according to the control signal and the register setting data;
• and
• a non-volatile memory connected to the signal line and configured to store register setting data supplied via the signal line from the ink jet head control circuit.

An ink jet head control circuit, comprising:

• a drive control circuit configured to output a control signal to a driver circuit of an ink jet head via a signal line;
• a non-volatile memory control circuit that controls access to a non-volatile memory of the ink jet head via the signal line;
• and
• a control switch that electrically connects the signal line to a ground potential when the control signal is supplied to the driver circuit of the ink jet head via the signal line, wherein
• data is supplied to the non-volatile memory of the ink jet head via the signal line, and
• the data specifies a period and a shape of a drive waveform generated in the ink jet head in response to the control signal.