Controller, head system, and printer

A head system comprising:

• a plurality of head units including a first head unit, a second head unit, and a third head unit, each of the plurality of head units having a nozzle;
• and
• a controller including a plurality of control circuits connected to respective ones of the plurality of head units, the plurality of control circuits including:
• a first control circuit configured to control the first head unit, the first control circuit including a first interface for connecting to the first head unit;
• a second control circuit connected to the first control circuit in series to perform communication, the second control circuit being configured to control the second head unit;
• and
• a third control circuit connected to the second control circuit in series to perform communication, the third control circuit being configured to control the third head unit,
• the first control circuit being configured to:
• receive basic data for controlling at least one of the plurality of head units, the basic data including first head data for controlling the first head unit;
• transmit the first head data to the first interface;
• delete the first head data from the basic data;
• and
• transmit first data to the second control circuit, the first data being obtained by deleting the first head data from the basic data, the first data being data for controlling at least one of the plurality of head units,
• the second control circuit being configured to transmit second data to the third control circuit, the second data being data for controlling at least one of the plurality of head units,
• a data amount of the second data being smaller than a data amount of the first data.

A printer comprising:

• a head system including:
• a plurality of head units including a first head unit, a second head unit, and a third head unit, each of the plurality of head units having a nozzle;
• and
• a controller including a plurality of control circuits connected to respective ones of the plurality of head units;
• and
• a conveyor configured to convey a print medium on which printing is performed with liquid ejected from the first head unit, the second head unit, or the third head unit,
• the plurality of control circuits including:
• a first control circuit configured to control the first head unit, the first control circuit including a first interface for connecting to the first head unit;
• a second control circuit connected to the first control circuit in series to perform communication, the second control circuit being configured to control the second head unit;
• and
• a third control circuit connected to the second control circuit in series to perform communication, the third control circuit being configured to control the third head unit,
• the first control circuit being configured to;
• receive basic data for controlling at least one of the plurality of head units, the basic data including first head data for controlling the first head unit;
• transmit the first head data to the first interface;
• delete the first head data from the basic data;
• and
• transmit first data to the second control circuit, the first data being obtained by deleting the first head data from the basic data, the first data being data for controlling at least one of the plurality of head units,
• the second control circuit being configured to transmit second data to the third control circuit, the second data being data for controlling at least one of the plurality of head units,
• a data amount of the second data being smaller than a data amount of the first data.