A non-transitory storage medium stores a program set readable by a computer of a first information processing apparatus. The program set including a first program and a second program. The first program causes the first information processing apparatus to start the second program, and register the started second program, as a virtual scanner, in an operating system of the first information processing apparatus. The second program causes the first information processing apparatus to transmit a scan command of the first protocol to the external scanner, and receive a read result from the external scanner by the first protocol through the communication interface. The external scanner reads a document in response to receipt of the scan command transmitted from the information processing apparatus.

A communication device may send a first negotiation request including first version information to a first external device via a communication interface of the communication device, execute first communication with the first external device via the communication interface by using the predetermined communication protocol of a second version, send a second negotiation request including second version information to the first external device via the communication interface in a case where an error notification is received from the first external device in the first communication, and execute second communication with the first external device via the communication interface by using the predetermined communication protocol of the first version.

A non-transitory storage medium stores a program set readable by a computer of a first information processing apparatus. The program set including a first program and a second program. The first program causes the first information processing apparatus to start the second program, and register the started second program, as a virtual scanner, in an operating system of the first information processing apparatus. The second program causes the first information processing apparatus to transmit a scan command of the first protocol to the external scanner, and receive a read result from the external scanner by the first protocol through the communication interface. The external scanner reads a document in response to receipt of the scan command transmitted from the information processing apparatus.

In a case where a setting of a function is changed from enabled to disabled, a printing apparatus stops transmission of a Bluetooth Low Energy packet in a format compatible with the function.

A printing device has a print unit for printing on roll paper; a wireless communication unit for communicating wirelessly with a paired control device; and a controller for receiving print data by wireless communication from the control device, and controlling the print unit based on the received print data. When changing from a pairing-disabled mode to a pairing-enabled mode, the controller controls the print unit to print pairing-related information on roll paper, does not process pairing in the pairing-disabled mode, and processes pairing when a pairing request is received in the pairing-enabled mode.

A printing device has a print unit for printing on roll paper; a wireless communication unit for communicating wirelessly with a paired control device; and a controller for receiving print data by wireless communication from the control device, and controlling the print unit based on the received print data. When changing from a pairing-disabled mode to a pairing-enabled mode, the controller controls the print unit to print pairing-related information on roll paper, does not process pairing in the pairing-disabled mode, and processes pairing when a pairing request is received in the pairing-enabled mode.

A communication apparatus may determine whether specific apparatus identification information for identifying a specific external apparatus is stored in a memory in a case where the specific apparatus identification information is received via a second interface from the specific external apparatus, shift an operating state of the communication apparatus from a non-parent station state to a parent station state in a case where it is determined that the specific apparatus identification information is stored in the memory, receive a wireless connection request from the specific external apparatus via a first interface after the operating state has been shifted from the non-parent station state to the parent station state, and form the wireless network in which the communication apparatus operates as the parent station and the specific external apparatus operates as a child station, in a case where the wireless connection request is received from the specific external apparatus.

A communication device may send a first negotiation request including first version information to a first external device via a communication interface of the communication device, execute first communication with the first external device via the communication interface by using the predetermined communication protocol of the second version, send a second negotiation request including second version information to the first external device via the communication interface in a case where an error notification is received from the first external device in the first communication, and execute second communication with the first external device via the communication interface by using the predetermined communication protocol of the first version.

A printing apparatus performs wireless communication based on Bluetooth Low Energy by selecting a format of a Bluetooth Low Energy packet to be transmitted from a plurality of formats and transmits a Bluetooth Low Energy packet in the selected format, where the plurality of formats includes a format associated with a print application of device external to the printing apparatus.

A printing device has a print unit for printing on roll paper; a wireless communication unit for communicating wirelessly with a paired control device; and a controller for receiving print data by wireless communication from the control device, and controlling the print unit based on the received print data. When changing from a pairing-disabled mode to a pairing-enabled mode, the controller controls the print unit to print pairing-related information on roll paper, does not process pairing in the pairing-disabled mode, and processes pairing when a pairing request is received in the pairing-enabled mode.