Chip and supply item for imaging device, including communication

A method of setting up electrical communications between an imaging device and a supply item installed in the imaging device, the imaging device having a controller configured on a master node of an I2C communications bus and the supply item having a chip configured on a slave node of the I2C communications bus, the chip of the supply item having a memory storing therein a firmware version identifying a current version of firmware in the chip, comprising:

• receiving at the chip of the supply item one or more requests for the firmware version from the controller of the imaging device;
• providing from the chip of supply item to the controller of the imaging device both an unencrypted and encrypted instance of the firmware version;
• and
• determining software features of the chip of the supply item corresponding to the firmware version.

A method of setting up electrical communications between an imaging device and a supply item installed in the imaging device, the imaging device having a controller configured on a master node of an I2C communications bus and the supply item having a chip configured on a slave node of the I2C communications bus, the chip of the supply item having a memory storing therein a firmware version identifying a current version of firmware in the chip, comprising:

• receiving at the chip of the supply item one or more requests for the firmware version from the controller of the imaging device;
• providing from the chip of supply item to the controller of the imaging device both an unencrypted and encrypted instance of the firmware version;
• and
• determining whether a match exists or not between the unencrypted instance and a decrypted instance of the encrypted instance of the firmware version to allow or not imaging operations of the imaging device.

A method of setting up electrical communications between an imaging device and a supply item configured for installation in the imaging device, the imaging device having a controller and the supply item having a chip configured to electrically communicate therewith, comprising:

• providing the chip of the supply item with a memory storing therein a firmware version identifying a current version of firmware in the chip;
• configuring the chip of the supply item to receive one or more requests for the firmware version from the controller of the imaging device;
• configuring the chip of the supply item to provide to the controller of the imaging device both an unencrypted and encrypted instance of the firmware version;
• determining software features of the chip of the supply item corresponding to the firmware version;
• and
• determining whether a match exists or not between the unencrypted instance and a decrypted instance of the encrypted instance of the firmware version to allow or not imaging operations of the imaging device.

A method of setting up electrical communications between an imaging device and a supply item configured for installation in the imaging device, the imaging device having a controller and the supply item having a chip configured to electrically communicate therewith, comprising:

• providing the chip of the supply item with a memory having stored therein a firmware version;
• enabling the chip of supply item to provide to the controller of the imaging device both an unencrypted and encrypted instance of the firmware version;
• and
• determining software features of the chip of the supply item corresponding to the firmware version.

A method of setting up electrical communications between an imaging device and a supply item configured for installation in the imaging device, the imaging device having a controller and the supply item having a chip configured to electrically communicate therewith, comprising:

• providing the chip of the supply item with a memory having stored therein a firmware version;
• enabling the chip of supply item to provide to the controller of the imaging device both an unencrypted and encrypted instance of the firmware version;
• and
• determining whether a match exists or not between the unencrypted instance and a decrypted instance of the encrypted instance of the firmware version to allow or not imaging operations of the imaging device.

A method of setting up electrical communications between an imaging device and a supply item configured for installation in the imaging device, the imaging device having a controller and the supply item having a chip configured to electrically communicate therewith, comprising:

• providing the chip of the supply item with a memory having stored therein a firmware version;
• enabling the chip of supply item to provide to the controller of the imaging device both an unencrypted and encrypted instance of the firmware version,
• wherein the chip of supply item is configured to provide to the controller of the imaging device first the unencrypted instance of the firmware version and later the encrypted instance of the firmware version;
• and
• establishing trust on an I2C communications bus between the controller and the chip upon verification of the encrypted instance of the firmware version.