Abstract: A commodity information display apparatus includes a shelf on which a commodity is displayed, and a display unit for displaying the commodity information about the commodity. The commodity information about the commodity related to an RFID tag detected by an antenna and a read device is acquired in advance from a store computer and stored in a storage unit. When the commodity information is displayed, the information is acquired from the storage unit, and displayed on the display unit.

Abstract: An antenna unit includes a plurality of loop antennas; an impedance matching circuit common to the loop antennas; a switching circuit that switches high frequency connection between the impedance matching circuit and the loop antenna; and an antenna control circuit that controls to connect only one loop antenna among the loop antennas in a high frequency manner on the basis of a control signal from a reader.

Abstract: A connection adapter converts in accordance with prescribed rules into a form suitable for a second communication device, transmits or discards data transmitted by high-level equipment for use by a first communication device, and also converts in accordance with prescribed rules into a form suitable for the high-level equipment, transmits or discards data received from the second communication device.

Abstract: A connection adapter is interposed between high-level equipment and a communication module. The connection adapter and a router perform a circuit control and an address conversion processing so that the high-level equipment and a management computer set for the network connection service giving a fixed IP address can use the network connection service giving a dynamic IP address.

Abstract: In the inventory management system managing the inventory status of a commodity displayed in a showcase by using a computer, the showcase is provided with an antenna for communicating with an RFID tag attached to a commodity on a commodity shelf, detecting means for detecting a unique number of the RFID tag by communicating with the RFID tag through the antenna, and transmitting means for transmitting the detected unique number of the RFID tag to the computer through a network. The computer manages the commodity inventory based on the unique number of the RFID tag, the unique number being received from the showcase.

Abstract: A control unit of a reader superimposes a control signal for antenna switching on a high frequency signal outputted into an antenna unit from a high frequency circuit. The antenna unit includes: separators for separating the superimposed signals into high frequency signals and control signals; a switch circuit for switching loop antennas; and a control circuit for controlling the switch circuit based on the control signal separated by the separator.

Abstract: An RFID tag reader having an antenna for communication with an RFID tag, a high frequency circuit for processing a communication signal with the RFID tag, a signal line for connecting the antenna with the high frequency circuit, and an impedance matching circuit for impedance matching between the antenna and the signal line includes: a detection unit for detecting a calibration RFID tag provided in a predetermined reading range; and a calibration unit for calibrating the high frequency circuit or matching circuit so that the calibration RFID tag can be detected by the detection unit.

Abstract: A control unit of a reader superimposes a control signal for impedance adjustment on a high-frequency signal outputted from a high-frequency circuit to an antenna unit to output a superimposed signal. The antenna unit includes a separating unit that separates the superimposed signal into the high-frequency signal and the control signal, a matching circuit that subjects the high-frequency signal separated by the separating unit to impedance matching and input the high-frequency signal to an antenna, and an adjusting unit that controls a circuit constant of the matching circuit on the basis of the control signal separated by the separating unit.

Abstract: A connection adapter is arranged to intervene between a communication device for connection to a radio packet communication network and high-level equipment that performs communication using the communication device. Also, a tunnel is formed between the connection adapter and a network router in a radio packet communication network to pass IP packets pertaining to communication between the high-level equipment and a LAN through the tunnel.

Abstract: A communication device includes a case approximately in a shape of box, data circuit-terminating equipment contained in the case for connecting with a radio packet communication network, and a circuit board provided with a circuit for connecting data terminal equipment and the data circuit-terminating equipment each other and mounted with the data circuit-terminating equipment, with an attachment integrated with the outside of the case.

Abstract: A communication device includes a case approximately in a shape of box, data circuit-terminating equipment contained in the case for connecting with a radio packet communication network, and a circuit board provided with a circuit for connecting data terminal equipment and the data circuit-terminating equipment each other and mounted with the data circuit-terminating equipment, in which the circuit board includes a main circuit board including a first interface circuit for connecting with data terminal equipment and a circuit for intervening communication between the data terminal equipment and the data circuit-terminating equipment, and an auxiliary circuit board including a second interface circuit for connecting the data circuit-terminating equipment and the main circuit board, and the data circuit-terminating equipment is mounted on the auxiliary circuit board.

Abstract: A connection adapter is interposed between high-level equipment and a communication module. The connection adapter and a router perform a circuit control and an address conversion processing so that the high-level equipment and a management computer set for the network connection service giving a fixed IP address can use the network connection service giving a dynamic IP address.

Abstract: A connection adapter converts in accordance with prescribed rules into a form suitable for a second communication device, transmits or discards data transmitted by high-level equipment for use by a first communication device, and also converts in accordance with prescribed rules into a form suitable for the high-level equipment, transmits or discards data received from the second communication device.

Abstract: A connection adapter includes first interfaces, second interfaces for connection to communication devices connected to a radio packet communication network, and a conversion circuit performing mutual conversion between an input/output signal from or to high-level equipment and an input/output signal from or to the communication device. The conversion circuit receives or supplies from or to the high-level equipment a signal simulating the communication device connectable to the high-level equipment and receives or supplies from or to the communication device a signal simulating the high-level equipment connectable to the communication device.

Abstract: A pulse arc welding apparatus feeds a consumable electrode with a constant rate, and arc-welds by applying a welding current constituted of a pulse current of a constant voltage characteristic and a base current of a constant current characteristic between the consumable electrode and a work piece. A pulse frequency correction circuit outputs a frequency correction value f.sub.e to a pulse frequency control circuit, such that when the pulse current upper limit value or lower limit value is selected continuously in a predetermined number of times at a pulse current comparison and adjustment circuit, pulse frequency is increased/decreased by a predetermined value .DELTA.-f by .DELTA.-f in accordance with the selected number of times.

Abstract: The consumable electrode type AC pulse arc welding apparatus is configured so that the pulse width setting circuit 16 includes the pulse width setting device 16a for hard wire, the pulse width setting device 16b for soft wire and the switch SW2 for switching the pulse width setting device. Further, the frequency setting device 20 includes the frequency setting device 20a for hard wire, the frequency setting device 20b for soft wire and the switch SW3 for switching the frequency setting device. By switching the switch SW1 when switching wire type, within the pulse width setting devices and the frequency setting devices, the selection between the hard wire side and the soft wire side can be simultaneously switched, thereby welding can be implemented with a suitable welding condition according to the wire type.

Abstract: A welding wire packaging container of mono-cylinder pail type accommodating a welding wire winding which includes of a multitude of layers of looped wire portions having diameters smaller than the inside diameter of the container and centrally having a cavity of substantially cylindrical form. The container includes a retaining member placed on overlying layers of wire loops and adapted to be lowered by gravity as the wire is withdrawn from the container, the retaining member being centrally formed with a circular wire guide hole to permit wire withdrawal therethrough, and resilient members mounted at least two spaced positions around the outer periphery of the retaining member for contact with the inner wall surface of the container, the guide hole in the retaining member being located in vertically spaced relation with an upper lid of the container.