Controller for two-way serial transmission and adapter for serial port
First Claim
1. A controller having a two-way serial communication function, comprising:
- a central processing unit; and
a serial communication device connected to said central processing unit, and including an interface having a serial data output port for outputting data transmitted from said central processing unit, and a serial data input port for inputting data transmitted to said central processing unit, said device further including an output buffer circuit, an input buffer circuit, and a data I/O terminal for transferring serial data to and from the outside;
said data I/O terminal being connected to said serial data output port via said output buffer circuit, and said data I/O terminal being connected to said serial data input port via said input buffer circuit, such that two-way serial data communication with said central processing unit can be conducted via said data I/O terminal and said serial data output and input ports.
1 Assignment
0 Petitions
Accused Products
Abstract
A controller performs two-way serial communications between a plurality of devices at one time through a reduced number of data communication lines by use of a serial communication line and a serial port adapter connected to a CPU and an external device. The controller includes the CPU, a serial communication device constituting the adapter, and a discriminator. The serial communication device includes an interface having output and input ports, an output buffer circuit, an input buffer circuit and a data I/O terminal for transferring data. The output port is connected via the output buffer circuit to the data I/O terminal. The data I/O terminal is connected also to the input port via the input buffer circuit. A single two-way serial data communication line is thus formed. The discriminator is provided in the CPU when a specified identification code is inputted to the input port of the serial communication device, data can be received.
-
Citations
21 Claims
-
1. A controller having a two-way serial communication function, comprising:
-
a central processing unit; and a serial communication device connected to said central processing unit, and including an interface having a serial data output port for outputting data transmitted from said central processing unit, and a serial data input port for inputting data transmitted to said central processing unit, said device further including an output buffer circuit, an input buffer circuit, and a data I/O terminal for transferring serial data to and from the outside; said data I/O terminal being connected to said serial data output port via said output buffer circuit, and said data I/O terminal being connected to said serial data input port via said input buffer circuit, such that two-way serial data communication with said central processing unit can be conducted via said data I/O terminal and said serial data output and input ports. - View Dependent Claims (2, 3, 4)
-
-
5. A controller having a central processing unit with a two-way serial communication function, comprising:
-
a serial port adapter including a serial data output port for outputting data transmitted from said central processing unit, a serial data input port for inputting data transmitted to said central processing unit, an output buffer circuit, an input buffer circuit, and a data I/O terminal for transferring serial data to and from the outside; said data I/O terminal being connected to said serial data output port via said output buffer circuit, and said data I/O terminal being connected to said serial data input port via said input buffer circuit, such that two-way serial data communication with said central processing unit can be conducted via said data I/O terminal and said serial data output and input ports. - View Dependent Claims (6)
-
-
7. A serial port adapter connected between a central processing unit and an external device to establish two-way serial communication between said central processing unit and said external device, comprising:
-
a data I/O terminal for inputting serial data from the external device and outputting serial data to the external device; an output buffer circuit having a serial data input terminal and a control signal input terminal, both connected to said central processing unit, and a serial data output terminal connected to said data I/O terminal, said output buffer circuit transmitting serial data, inputted via said serial data input terminal, to said data I/O terminal in response to a data output control signal inputted via said control signal input terminal; and an input buffer circuit having a serial data input terminal connected to said data I/O terminal and a serial data output terminal connected to said central processing unit, said input buffer circuit also having a signal line for transmitting serial data, inputted via said data I/O terminal, to said serial data output terminal of said input buffer circuit. - View Dependent Claims (8)
-
-
9. A serial port adapter connected to a central processing unit, comprising:
-
a data I/O terminal for outputting data from said central processing unit to an external device, and inputting data from said external device to said central processing unit; a serial data output buffer circuit; and a serial data input buffer circuit; said serial data output buffer circuit being connected to said central processing unit and said data I/O terminal for transferring data from said central processing unit to the external device as serial data via said data I/O terminal, and said serial data input buffer circuit being connected to said central processing unit and said data I/O terminal for transferring to said central processing unit data received from the external device as serial data via said data I/O terminal, such that two-way serial data communication between said central processing unit and the external device can be conducted via said data I/O terminal and said serial data output and input buffer circuits.
-
-
10. Apparatus comprising a plurality of operating units and a corresponding plurality of control units each controlling a respective operating unit,
wherein each said control unit includes a central processing unit and a serial communication device connected to said central processing unit, said serial communication device comprising a serial data I/O terminal, a serial data output port for outputting data transmitted from said central processing unit, a serial data input port for inputting data transmitted to said central processing unit, an output buffer circuit connecting said serial data output port to said serial data I/O terminal, and an input buffer circuit connecting said serial data input port to said serial data I/O terminal, such that two-way serial communication with said central processing unit can be conducted via said serial data I/O terminal and said serial data output and input ports, and wherein the respective serial data I/O terminals of the serial communication devices of said plurality of control units are all connected to a single two-way serial data communication line.
-
16. Apparatus comprising a plurality of operating units and a corresponding plurality of control units each controlling a respective operating unit,
wherein each said control unit includes a central processing unit and a serial port adapter connected to said central processing unit, said serial port adapter comprising a serial data I/I/O terminal, a serial data output buffer circuit connecting serial data I/O terminal to said central processing unit for transferring data transmitted from said central processing unit, and a serial data input buffer circuit connecting said serial data I/O terminal to said central processing unit for transferring data transmitted to said central processing unit, such that two-way serial communication with said central processing unit can be conducted via said serial data I/O terminal and said serial data output and input buffer circuits, and wherein the respective serial data I/I/O terminals of the serial port adapters of said plurality of control units are all connected to a single two-way serial data communication line.
Specification