JP2946047B2 - Electronic device and control method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an information device using an RS-232-C line.

[Prior Art] When there is a possibility that a plurality of types of barcode readers and terminal devices may be connected to one RS-232-C interface, in use, a user should connect a barcode reader or a terminal device. Further, when connecting a barcode reader, the communication speed and control commands differ depending on the barcode reader, so it has been necessary to input and specify the type of barcode reader to be connected from the operation unit. When connecting a barcode reader, use RS-232
When power is supplied to the bar code reader through the C interface connector and terminal equipment is connected, RS-232
The power supply was controlled by a user's instruction so as not to output power to the C interface connector.

[Problems to be Solved by the Invention] When a user makes a mistake in selecting a device to be connected to the RS-232-C interface, not only a normal operation is not performed, but also a power supply to terminal devices other than a barcode reader. Is supplied, an overcurrent flows in the power supply, and there is a possibility that the power supply unit of the terminal device or the system is destroyed. An object of the present invention is to provide a device which is automatically determined even if a device connected to a terminal portion is not a specific person in charge.

[Means for Solving the Problems] In order to achieve the above object, an electronic device according to the present invention includes a transmission terminal for transmitting data to a connected terminal device, and a plurality of reception terminals for receiving a signal from the terminal device. Comparing the predetermined data output to the transmission terminal with the data input from the reception terminal, and determining the type of the terminal device according to the reception terminal to which the same data as the output data is input If there is no receiving terminal to which the same data as the output data is input, the device determining means determines that the terminal device is not connected, and power is supplied to the terminal device in accordance with the output of the device determining means. And switch means for permitting or prohibiting.

Further, the electronic device of the present invention, a transmission terminal for transmitting data to a terminal device to be connected, an interface means including a plurality of reception terminals for receiving signals from the terminal device,
The predetermined data output to the transmission terminal is compared with the data input from the reception terminal, and the type of the terminal device is determined according to the reception terminal to which the same data as the output data is input,
If there is no receiving terminal to which the same data as the output data is input, the terminal device determines that the terminal device is not connected, and the terminal device needs to use the terminal device according to the output of the device determining device. Control means for setting.

Further, the control method of an electronic device according to the present invention is a control method for an electronic device having an interface unit having a transmission terminal for transmitting data to a connected terminal device and a plurality of reception terminals for receiving a signal from the terminal device. A transmitting step of outputting predetermined data to a transmitting terminal, a receiving step of inputting data from a receiving terminal, a comparing step of comparing output data and input data, and a method according to a result of the comparing step. ,
The type of the terminal device is determined according to the receiving terminal to which the same data as the output data is input. If there is no receiving terminal to which the same data as the output data is input, the terminal device is determined to be unconnected. It is characterized by including a device discriminating step and a power supply step of permitting or prohibiting the supply of power to the terminal device according to the result of the device discriminating step.

Further, the method of manufacturing an electronic device according to the present invention is a method for controlling an electronic device having an interface unit having a transmission terminal for transmitting data to a connected terminal device and a plurality of reception terminals for receiving a signal from the terminal device. A transmitting step of outputting predetermined data to a transmitting terminal, a receiving step of inputting data from a receiving terminal, a comparing step of comparing output data and input data, and a method according to a result of the comparing step. ,
The type of the terminal device is determined according to the receiving terminal to which the same data as the output data is input. If there is no receiving terminal to which the same data as the output data is input, the terminal device is determined to be unconnected. It is characterized by comprising a device discriminating step and a control step of making settings necessary for using the terminal device according to the result of the device discriminating step.

Embodiment FIG. 1 shows the configuration of the present system.

Reference numeral 1 denotes a device including a CPU (Central Processing Control Unit), a memory, and peripheral circuits, which controls the present system. As the CPU, a general CPU such as 8 bits or 16 bits is used.

The operation unit 2 is a part where the user operates the system, and the display unit 4 is a part where the system shows information to the user.

The UART3 is a start-stop synchronous communication controller for performing RS-232-C communication, and uses, for example, 8251 or the like from Intel Corporation. Driver and receiver are TTL level and RS-232
This is for performing signal level conversion between -C level.

Q1 is a transistor that controls power supplied to a barcode reader connected to the system, and is controlled by the CPU.

PORT in 1 is a port for controlling the transistor Q1 and is constituted by a latch and decode circuit. The resistor R is used to determine a base current flowing through Q1.

The RS-232-C connector 5 is a connector for connecting an external device to the system.

2 and 3 show the configuration of the barcode reader.
FIG. 2 shows a bar code reader of a type which scans manually, and FIG. 3 shows a bar code reader which scans automatically. The reading sections 22 and 32 are sections for reading the reflected light from the bar code. The control units 21 and 31 have a function of decoding the read signal and transmitting the decoded signal to the outside. The drivers and receivers 23 and 33 are parts for performing conversion between the TTL level and the RS-232-C level. The bar code reader that performs manual scanning is connected to TXD and DSR of the RS-232-C signal. Barcode readers that scan automatically
TXD and CTS of the RS-232-C signal are connected.

FIG. 4 shows a flowchart of the mounting judgment of the barcode reader.

After outputting the transmission data from the UART to TXD (41), the CPU
It is determined whether the same signal as TXD can be read from DSR (42). With a bar code reader that scans manually
Since TXD and DSR are connected, transmission data can be read through DSR. Therefore, the answer is YES and the power is supplied to the barcode reader (43), and the initial setting for using the barcode reader of the manually scanning type is performed (44).
Perform a read operation. (45) If NO in (42), it is determined whether the transmission data can be read from the CTS. (46) In the case of a barcode reader that scans automatically, the transmission data can be read through the CTS because the TXD and CTS are connected. Therefore, the answer is YES, and power is supplied to the barcode reader (47), initialization is performed to use a barcode reader of an automatically scanning type (48), and a reading operation is performed. (45) If NO in both 42 and 46, it is determined that the barcode reader is not connected. (49) In this case, Q1 is not turned on and + 5V is applied to the RS-232-C connector.
Do not supply.

As described above, according to the present invention, it is possible to determine whether or not the user uses the barcode reader and the device connected to the RS-232-C without inputting the type of the barcode reader to be used from the operation unit. Processing can be performed as needed.

Therefore, it is not impossible for the user to perform a normal operation by performing an erroneous operation, and power is supplied to the terminal device other than the barcode reader and connected to the RS-232-C connector of the present system or the power supply of the present system. No parts are destroyed.

[Effects of the Invention] As described above, the electronic device of the present invention includes an interface unit having a plurality of terminals, a device determination unit that determines a type of a terminal device via the interface unit,
Switch means for permitting or prohibiting the supply of power used for the terminal equipment to the terminal of the interface means in accordance with the result of the determination by the equipment determination means. The terminal device or the electronic device is not destroyed.

In this case, the interface means includes a transmission terminal for transmitting data to the terminal device and a plurality of reception terminals for receiving a signal from the terminal device, and the device determination means includes a predetermined terminal output to the transmission terminal. It consists of a controller that compares the data with the data input from the receiving terminal and determines the type of the terminal device according to the receiving terminal where the same data is input. It is possible to determine.

Also, the electronic device of the present invention has an interface means including a transmission terminal for transmitting data to a connected terminal device, a plurality of reception terminals for receiving a signal from the terminal device, and an output device for the transmission terminal. Device determining means for comparing predetermined data with data input from a receiving terminal and determining the type of the terminal device according to the receiving terminal to which the same data has been input; Control means for performing processing according to the necessity of the terminal device, so that the type of the terminal device can be reliably determined with a simple configuration, and the type of the terminal device can be determined based on the determination result. Can be automatically selected and executed.

[Brief description of the drawings]

1 to 3 show a circuit according to the invention, FIG.
The figure is a flowchart of the present invention. 1: CPU, memory, control unit 2: Operation unit 4: Display unit 5: Connector

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Yoshikawa 1-26-5 Toranomon, Minato-ku, Tokyo NTT Data Communication Corporation (72) Inventor Saori Yonekura 1 Toranomon, Minato-ku, Tokyo No. 26-5, NTT Data Communication Co., Ltd. (56) References JP-A-62-78662 (JP, A) JP-A-62-172439 (JP, A) JP-A-62-232058 (JP, A) JP-A-63-201856 (JP, A) JP-A-61-75983 (JP, A) JP-A-61-32157 (JP, A) JP-A-63-27927 (JP, U) Opened Showa 55-81823 (JP, U) Opened Showa 62-162755 (JP, U) Opened Showa 62-66350 (JP, U)

Claims (4)

(57) [Claims] An interface means comprising: a transmission terminal for transmitting data to a terminal device to be connected; a plurality of reception terminals for receiving a signal from the terminal device; and predetermined data output to the transmission terminal. And the data input from the reception terminal, and the type of the terminal device is determined according to the reception terminal to which the same data as the output data is input, and the same data as the output data is input. Device determining means for determining that the terminal device is not connected when the receiving terminal is not provided, and switch means for permitting or prohibiting supply of power to the terminal device according to an output of the device determining means. An electronic device comprising: 2. An interface means having a transmission terminal for transmitting data to a terminal device to be connected, a plurality of reception terminals for receiving a signal from the terminal device, and predetermined data output to the transmission terminal. And the data input from the reception terminal, and the type of the terminal device is determined according to the reception terminal to which the same data as the output data is input, and the same data as the output data is input. Device determining means for determining that the terminal device is not connected when the receiving terminal does not exist, and control means for performing setting necessary for using the terminal device in accordance with an output of the device determining means. An electronic device comprising: 3. A control method for an electronic device having an interface means having a transmission terminal for transmitting data to a terminal device connected thereto and a plurality of reception terminals for receiving a signal from the terminal device, A transmitting step of outputting predetermined data to a transmitting terminal; a receiving step of inputting data from the receiving terminal; a comparing step of comparing the output data with the input data; and, according to a result of the comparing step, The type of the terminal device is determined according to the reception terminal to which the same data as the output data has been input. If there is no reception terminal to which the same data as the output data is input, the terminal device is not connected. And a power supply step of permitting or prohibiting the supply of power to the terminal device according to the result of the device determination step. Method of controlling the vessel. 4. A method for controlling an electronic device having an interface means having a transmission terminal for transmitting data to a terminal device to be connected and a plurality of reception terminals for receiving a signal from the terminal device, A transmitting step of outputting predetermined data to a transmitting terminal; a receiving step of inputting data from the receiving terminal; a comparing step of comparing the output data with the input data; and, according to a result of the comparing step, The type of the terminal device is determined according to the reception terminal to which the same data as the output data has been input. If there is no reception terminal to which the same data as the output data is input, the terminal device is not connected. An electronic device, comprising: a device determining step of determining that the terminal device is used; and a control step of performing setting necessary for using the terminal device according to a result of the device determining step. Control method.