Abstract: A communication system includes a network cradle provided on a network, and a handy terminal connected to the network through the network cradle. The handy terminal includes a control unit generating a header in an IP protocol including a MAC address of the handy terminal as a transmission source MAC address, generating first data obtained by adding the header to data to be transmitted, and generating second data obtained by adding a header in a P2P protocol to the first data, and a communication unit transmitting the second data to the network cradle by the P2P protocol. The network cradle includes a mobile terminal communication unit that receives the second data transmitted from the handy terminal, and a network communication unit transmitting the first data obtained by removing the header in the P2P protocol from the second data, to the network.

Abstract: A cash drawer device includes a command receiving and outputting circuit for receiving a plurality of open commands and outputs the open commands, and a simultaneous open inhibiting circuit for inhibiting the command receiving and outputting circuit from simultaneously outputting more than one of the open commands when more than one of the open commands are simultaneously received by the command receiving and outputting circuit. A first simultaneous open inhibiting circuits includes an exclusive OR gate. A second simultaneous open inhibiting circuit includes first and second D flip-flops. The cash drawer device may further include a concurrent open inhibiting circuit having a timer responsive to one of the open commands for inhibiting the command receiving and outputting circuit from outputting another of the open commands for a predetermined interval. Thus, power consumption of driving a plurality of drawers can be suppressed. The invention also includes a method of controlling cash drawers.

Abstract: It includes first and command receiving and outputting circuit for receiving a plurality of open commands and outputs the open commands; and a simultaneous open inhibiting circuit for inhibiting the command receiving and outputting means from simultaneously outputting more than one of the open commands when more than one of the open commands are simultaneously received by the command receiving and outputting circuit. The first simultaneous open inhibiting circuits comprises an exclusive OR gate. The second simultaneous open inhibiting circuit comprises first and second D flip-flops. It may further comprise a concurrent open inhibiting circuit including a timer responsive to one of the open commands for inhibiting the command receiving and outputting circuit from outputting another of the open commands for a predetermined interval. The corresponding method is also disclosed. Thus, simultaneous power consumption of driving a plurality of drawers can be suppressed.

Abstract: An image-data-system host computer outputs image data, the protocol of which is not disclosed. The image data outputted from the image-data-system host computer is transmitted via an image-data-system terminal and a video control unit to a data management unit. On the other hand, the data management unit decrypts in accordance with a protocol and acquires text data outputted from a text-system host computer whose protocol is disclosed. A signal transmitting unit transmits the image data and the text data outputted from the data management unit via a coaxial cable to a display unit. The display unit displays images in response to the image data and the text data received from the signal transmitting unit.