Data transfer unit and method of power supply to the data transfer unit

A power supply arrangement for a data transfer unit interposed between devices for executing data exchange according to a handshaking process based on a signal level, said data transfer unit comprising:

• a power circuit for receiving an electric current via two or more rectifiers respectively connected in a forward direction to two or more signal lines for two or more signals which are output from said devices and not fixed simultaneously at a lower level, and generating a predetermined positive voltage;
• and
• power supply means for supplying an output from said power circuit as power of a logic circuit;
• where in said logic circuit further comprises
• input means for receiving data output from a data transmitting device at a timing of said data transmitting device;
• storage means for storing said data received by said input means;
• and
• output means for sending said stored data to a data receiving device at a timing of said data receiving device.

A method of supplying power to a data transfer unit, which is interposed between devices for executing data exchange according to a handshaking process based on a signal level, said method comprising steps of:

• receiving an electric current via a rectifier connected in a forward direction to a signal line used for handshaking to generate a predetermined positive voltage;
• receiving an electric current via a rectifier connected in a reverse direction to said signal line used for handshaking to generate said predetermined positive voltage;
• and
• supplying said predetermined positive voltage as power of a logic circuit used for data transmission.

A method of supplying power to a data transfer unit, which receives parallel data output from a device of parallel data exchange, converts said parallel data to serial data, and transmits said serial data to a device of serial communications, said method comprising steps of:

• receiving an electric current via a rectifier connected in a forward direction to a signal line output from said device of serial communications to generate a predetermined positive voltage;
• receiving an electric current via a rectifier connected in a reverse direction to said signal line output from said device of serial communications to generate said predetermined positive voltage;
• and
• supplying said predetermined positive voltage as power of a logic circuit used for data conversion and transmission.

A data transfer unit interposed between a crevice of parallel data exchange and a device of serial communications, said data transfer unit being used for transferring data transmitted from one of said devices to the other, said data transfer unit comprising:

• a first power circuit for receiving an electric current via a rectifier connected in a forward direction to a signal line used for handshaking, and generating a predetermined positive voltage;
• a second power circuit for receiving an electric current via a rectifier connected in a reverse direction to said signal line used for handshaking, and generating said predetermined positive voltage;
• and
• a transfer circuit which receives said predetermined positive voltage generated from said first and second power circuits as power, said transfer circuit being used for receiving data transmitted from said one device in accordance with transmission timing of said one device and converting received data to a specific format of data exchanged by the other one of said devices to send converted data to the other device.

A data transfer unit interposed between two devices for executing data exchange with handshaking based on a signal level, said data transfer unit being used for transferring data transmitted from one of said two devices to the other said data transfer unit comprising:

• a power circuit for receiving an electric current via two or more rectifiers respectively connected in a forward direction to two or more signal lines which are connected to said two devices and not fixed simultaneously at a lower level, and generating a predetermined positive voltage;
• a semiconductor storage medium which receives said predetermined positive voltage generated from said power circuit as power, and is capable of reading and writing data;
• and
• a transmit-receive circuit which receives said predetermined positive voltage generated from said power circuit as power, said transmit-receive circuit being used for receiving data transmitted from said one device in accordance with transmission timing of said one device, writing said received data into said semi conductor storage medium and sending said data written into said semi conductor storage medium to the other device.