Recording apparatus with controlled power supply

A recording apparatus that receives data from a data supply apparatus and performs recording based on the received data, said recording apparatus comprising:

• interface signal control means for controlling input of a signal received through a signal input line from the data supply apparatus and controlling at least one signal output line that outputs a signal to the data supply apparatus to go to a high signal level or a low signal level;
• pull-up means for pulling up the at least one signal output line;
• power supply means for supplying electric power to said pull-up means and for constantly supplying electric power to said interface signal control means;
• input for inputting a power off instruction;
• control means, responsive to the power off instruction, for controlling said interface signal control means to control the at least one signal output line to go to a low signal level and controlling said power supply means to stop power supply to said pull-up means;
• and
• image forming means for forming an image on a recording medium based on the data received from the data supply apparatus.

A control method for communicating with an associated apparatus, said control method comprising the steps of:

• controlling, with an interface signal control circuit, input of a signal received through a signal input line from the associated apparatus and controlling at least one signal output line that outputs a signal to the associated apparatus to go to a high signal level or a low signal level;
• pulling up the at least one signal output line with a pull-up resistor;
• supplying electric power to the pull-up resistor and constantly supplying electric power to the interface signal control circuit with a power supply circuit;
• inputting a power off instruction;
• and
• controlling, in response to the power off instruction, the interface signal control circuit to control the at least one signal output line to go to a low signal level and controlling the power supply circuit to stop power supply to the pull-up resistor.

A recording method for receiving data from a data supply apparatus and performing recording based on the received data, said recording method comprising the steps of:

• controlling, with interface signal control means, input of a signal received through a signal input line from the data supply apparatus and controlling at least one signal output line that outputs a signal to the data supply apparatus to go to a high signal level or a low signal level;
• pulling up the at least one signal output line with pull-up means;
• supplying electric power to the pull-up means and constantly supplying electric power to the interface signal control means with power supply means;
• inputting a power off instruction;
• controlling with control means, in response to the power off instruction, the interface signal control means to control the at least one signal output line to go to a low signal level and controlling the power supply means to stop power supply to the pull-up means;
• and
• forming an image on a recording medium based on the data supplied from the data supply apparatus.