JPH07129880A - Sensor recognition device - Google Patents

Abstract

PURPOSE:To reduce the cost, simplify wiring, reduce the size of a circuit, and reduce the load by decreasing the number of transmission lines for sending sensor information to one. CONSTITUTION:This device is equipped with plural sensors 11, an analog converting means 12 which converts the outputs of all the sensors 11 into different analog values according to sensor operation, one transmission line 15 which sends the analog sensor information from the analog converting means 12, an A/D converter means 13 which converts the analog sensor information sent from this transmission line 15 into a digital value, and a recognizing means 14 which recognizes a sensor which has operated on the basis of the digital sensor information from the A/D converting means 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor recognition device.

[0002]

2. Description of the Related Art Conventionally, for example, a card reader is known as an information processing apparatus for storing or reading information on a card. In this card reader, for example, in order to recognize where the card is in the conveyance path in the device, or to detect terminals exposed on the card surface,
Many sensors are used. The information of these sensors is transmitted to the CPU via transmission lines (harnesses) connected to the sensors, respectively, and various controls are performed.

[0003]

However, the above card reader has the following problems. That is, as described above, since many sensors are used,
There are problems that the number of transmission lines is large, the cost is high, and the wiring is complicated.

Further, as described above, since the number of transmission lines increases, a large number of input port terminals of the CPU are inevitably required, which causes a problem that the circuit becomes large and the load becomes large.

Therefore, the present invention provides a sensor recognition device in which the number of transmission lines for transmitting sensor information is reduced to one, and the cost is reduced, the wiring is simplified, the circuit is downsized, and the load is reduced. With the goal.

[0006]

In order to achieve the above object, the sensor recognition device of the present invention has a plurality of sensors and an analog conversion means for converting the outputs of all the sensors into analog values having different values according to the sensor operation. A transmission line for transmitting the analog sensor information from the analog conversion means, an A / D converter means for converting the analog sensor information transmitted from the transmission line into a digital value, and the A
And a recognition means for recognizing the operated sensor based on the digital sensor information from the / D converter means.

[0007]

According to the sensor recognition device in such means, since the outputs of all the sensors are converted into analog values having different values according to the sensor operation, the transmission of the sensor information can be performed by one transmission line. With this, the sensor that has operated according to the sensor information can be determined.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a sensor recognition device showing an embodiment of the present invention, and FIG. 2 is a circuit diagram of a front stage portion including a transmission line in FIG. 1, and the sensor recognition device is applied to a card reader.

As shown in FIG. 1, the present sensor recognition device includes a transmission section 20 including a sensor section 11 and a D / A conversion section 12, and a reception section 30 including an A / D conversion section 13 and a recognition section 14. , And a transmission line 15 for transmitting the sensor information of the transmitter 20 to the receiver 30.

As shown in FIG. 2, the sensor section 11 has a first sensor 1, a second sensor 2 and a third sensor 3, and these first, second and third sensors are provided. Transistors Tr1 to 1 are provided in the output stages of 1, 2, and 3.
Each Tr3 is provided.

The emitters of the transistors Tr1 to Tr3 are respectively connected to the ground, and the transistor Tr1
The collector of No. 1 is connected to the 5V power source _Vcc through voltage dividing resistors R01 and R04. The collector of the transistor Tr2 is connected to the connection point of the voltage dividing resistors R01 and R04 via the voltage dividing resistor R02, and the connection point of the voltage dividing resistors R02 and R04 is connected to the transistor Tr3 via the voltage dividing resistor R03.
The collector of is connected. Thus, the outputs of the first, second and third sensors 1, 2 and 3 are so-called transistor open collector outputs.

The resistance values of the voltage dividing resistors R01 to R04 are 1 KΩ, 2.2 KΩ, 3.9 KΩ and 1 KΩ, respectively.
Has become.

The output terminal 20a of the transmitter 20 is connected to the connection point of the voltage dividing resistors R03 and R04, and between the output terminal 20a and the input terminal (analog input terminal) 30a of the receiver 30 in the subsequent stage. Is provided with a transmission line 15 having one end connected to the output terminal 20a and the other end connected to the input terminal 30a of the receiver 30. Between the transmission unit 20 and the reception unit 30, a 5V power supply line 1 for connecting both 5V power supplies to each other
6 and ground power supply lines 17 for connecting the two ground power supplies are respectively wired. The 5V power supply line 16, the ground power supply line 17, and the transmission line 15 are bundled in a cable (not shown).

As shown in FIG. 1, the input terminal 30a is connected to a known A / D conversion means 13 for converting the analog-transmitted sensor information into a digital signal. The A / D conversion means 13 is connected to the input terminal 30a. The recognition means 14 is connected to.

The recognition means 14 is an A / D conversion means 13
This is a so-called microcomputer that is configured to recognize the operated sensor based on the digital sensor information output from the storage device, and has a storage device (ROM, ROM, etc.) that stores programs, setting values, and data tables.
RAM) is provided. Therefore, the operation is as follows.

That is, when any one of the transistors operates, the divided analog voltage is transmitted from the transmitting section 20, but the voltage dividing resistors R01 to R04 have weights as described above. Therefore, the recognizing means 14 can determine which transistor has operated according to the analog voltage. This determination can be made not only when each sensor operates independently, but also when a plurality of sensors operate simultaneously, which sensor operates based on the analog voltage.

As described above, in the present embodiment, the number of transmission lines 15 for transmitting the sensor information, which has been conventionally required in large numbers, can be reduced to one, thus reducing the cost and wiring. It is possible to simplify.

Further, as described above, since the number of the transmission lines 15 can be one, the number of terminals 30a of the input port of the CPU can be one, so that the circuit can be downsized and the load can be reduced. It is also possible to plan.

Furthermore, in this embodiment, the resistors R01 to R0 are used as means for D / A converting the sensor information.
Since the voltage division method using 4 is adopted, the configuration is simple and economical.

In the resistance voltage dividing system shown in FIG. 2, the number of sensors is limited to about 3 because of accuracy, but the accuracy of D / A conversion and A / D conversion can be improved. If
It is also possible to support more sensors.

Although the invention made by the present inventor has been specifically described based on the embodiments, the invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, for example, in the above-mentioned embodiment, the sensor of the open collector output type of the transistor has been described, but a sensor with a built-in pull-up resistor is also possible. But,
In that case, it is necessary to insert a diode to cut off the influence of the pull-up resistor.

The sensor output is not limited to the transistor output as long as it is an on / off or high / low output, and may be a contact output of a switch or the like.

Furthermore, in the above embodiment, an example in which the sensor recognition device is applied to a card reader is described, but the sensor recognition device can be applied to all devices having a plurality of sensors. Needless to say.

[0024]

As described above, according to the sensor recognition apparatus of the present invention, a plurality of sensors, an analog conversion means for converting the outputs of all the sensors into different analog values according to the sensor operation, and the analog conversion means. One transmission line for transmitting the analog sensor information from the conversion means, an A / D converter means for converting the analog sensor information transmitted from this transmission line into a digital value, and a digital sensor from this A / D converter means Since the recognizing means for recognizing the operated sensor based on the information is provided, the number of transmission lines for transmitting the sensor information becomes one, and the cost can be reduced and the wiring can be simplified.

Since the number of transmission lines is one, C
The number of input ports of the PU is also one, so that the circuit can be downsized and the load can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a sensor recognition device showing an embodiment of the present invention.

FIG. 2 is a circuit diagram of a front stage portion including a transmission line in FIG.

[Explanation of symbols]

 1, 2 and 3 sensor 11 sensor part 12 D / A conversion means 13 A / D conversion means 14 recognition means 15 transmission line R01 to R04 voltage dividing resistance

Claims (1)

[Claims] 1. A plurality of sensors, an analog converting means for converting outputs of all the sensors into analog values having different values according to sensor operation, and one transmission line for transmitting analog sensor information from the analog converting means. A / D converter means for converting the analog sensor information transmitted from the transmission line into a digital value, and a recognition means for recognizing the operated sensor based on the digital sensor information from the A / D converter means, A sensor recognition device comprising: