A method of electrical communication between a slave node of an I2C communication bus positioned on a replaceable supply item installed in an image forming device and a controller of the image forming device as a master node of the I2C communication bus, comprising: receiving a first write command by the slave node on the replaceable supply item from the controller of the image forming device; comparing by the slave node on the replaceable supply item a value of a transmission cycle bit (tc n) contained in a header of the first write command with a value of a transmission cycle bit (tc n-1) contained in a header of a second write command received by the slave node on the replaceable supply item from the controller of the image forming device previous to the first write command; and if the value of the transmission cycle bit (tc n) contained in the header of the first write command is equal to the value of the transmission cycle bit (tc n-1) contained in the header of the second write command, comparing by the slave node on the replaceable supply item a value of a command ID (Command n) of the first write command with a value of a command ID (Command n-1) of the second write command; and if the value of the command ID (Command n) of the first write command is equal to the value of the command ID (Command n-1) of the second write command, sending (409 by the slave node on the replaceable supply item to the controller of the image forming device a response to the second write command without executing the first write command. receiving a first write command by the slave node on the replaceable supply item from the controller of the image forming device; comparing by the slave node on the replaceable supply item a value of a transmission cycle bit (tc n) contained in a header of the first write command with a value of a transmission cycle bit (tc n-1) contained in a header of a second write command received by the slave node on the replaceable supply item from the controller of the image forming device previous to the first write command; and if the value of the transmission cycle bit (tc n) contained in the header of the first write command is equal to the value of the transmission cycle bit (tc n-1) contained in the header of the second write command, comparing by the slave node on the replaceable supply item a value of a command ID (Command n) of the first write command with a value of a command ID (Command n-1) of the second write command; and if the value of the command ID (Command n) of the first write command is equal to the value of the command ID (Command n-1) of the second write command, sending (409 by the slave node on the replaceable supply item to the controller of the image forming device a response to the second write command without executing the first write command. comparing by the slave node on the replaceable supply item a value of a command ID (Command n) of the first write command with a value of a command ID (Command n-1) of the second write command; and if the value of the command ID (Command n) of the first write command is equal to the value of the command ID (Command n-1) of the second write command, sending (409 by the slave node on the replaceable supply item to the controller of the image forming device a response to the second write command without executing the first write command.