JP6269057B2 - ID information setting circuit - Google Patents

Description

  The present invention relates to an ID information setting circuit that sets ID information for identifying a plurality of electronic devices as different analog voltage values for each electronic device and supplies the analog information to an A / D conversion port of a microcomputer.

  In a data collection system constructed by connecting a plurality of electronic devices to a microcomputer, different ID information is set for each electronic device. The microcomputer is configured to identify the plurality of electronic devices from the ID information and collect data (see, for example, Patent Document 1). Incidentally, the ID information is set by writing the ID information from an external device to the built-in memory of each electronic device using, for example, software of the microcomputer. Or, simply, for example, different ID information is set for each electronic device by turning on / off the switches provided in the electronic device.

  FIG. 10 shows an example of the ID information setting circuit 1 provided in the electronic apparatus. Reference numerals 2a, 2b, 2c, and 2d are resistance elements to which a predetermined power supply voltage Vcc is applied at one end. Reference numerals 3a, 3b, 3c and 3d denote switch elements for selectively grounding the other ends of the resistance elements 2a, 2b, 2c and 2d. These switch elements 3a, 3b, 3c, 3d are so-called rotary switches or dip switches. These switch elements 3a, 3b, 3c, 3d are used to set 4-bit ID information. The level of the other end of the resistance elements 2a, 2b, 2c, 2d is set to L (0) by an ON operation. , Plays a role of setting to H (1) by an off operation. Therefore, in this example, 16 steps of different ID information consisting of [0000] to [1111] are set by the selective operation of the switch elements 3a, 3b, 3c, 3d.

  Thus, ID information set for each of a plurality of electronic devices is inputted in parallel to the I / O ports 5a, 5b, 5c, 5d of the microcomputer 4 and is identified by the microcomputer 4.

JP 2010-198511 A

  As described above, in the method of setting ID information using an external device, it is difficult to individually confirm the ID information set in the built-in memory for each electronic device. Incidentally, in order to confirm the ID information, for example, a display for confirming the recorded contents of the built-in memory is required. In this regard, according to the technique using the switch elements 3a, 3b, 3c, and 3d, the ID information can be easily visually recognized from the operation state of the switch elements 3a, 3b, 3c, and 3d.

  On the other hand, in order to provide the microcomputer with the ID information set as described above, a plurality of I / O ports 5a, 5b, 5c, 5d corresponding to the number of bits of the ID information are prepared in the microcomputer 4. There is a need to. Moreover, it cannot be denied that the number of interface wirings with the microcomputer 4 also increases. Furthermore, there is a problem that use in the microcomputer 4 having a small number of I / O ports is restricted.

  The present invention has been made in view of such circumstances, and an object of the present invention is to easily set the ID information for each electronic device so as to be visible, and to set the ID information set in the electronic device as I / O. An object of the present invention is to provide an ID information setting circuit that can be given to a microcomputer without restriction on the number of O ports.

In order to achieve the above object, the ID information setting circuit according to the present invention is provided in each of a plurality of electronic devices connected to the microcomputer,
A voltage dividing circuit for setting the ID information given to the microcomputer as an analog voltage value obtained by dividing a predetermined voltage, and an ID information selecting means for variably setting the voltage dividing ratio of the voltage dividing circuit are provided. .

  In the microcomputer, the analog voltage value is input to an A / D conversion port to identify the ID information.

  Preferably, the ID information selection means includes a switch circuit that selectively selects a plurality of voltage dividing circuits having different voltage dividing ratios, for example.

Specifically, the voltage dividing circuit, for example, includes a first resistance element to which the predetermined voltage is applied, and a plurality of analog voltage values that are selectively connected in series to the first resistance element and have different voltage dividing ratios. A plurality of second resistance elements to be set,
The ID information selection means is realized as a switch circuit that selectively connects the second resistance element to the first resistance element to selectively set the analog voltage value.

Alternatively, the voltage dividing circuit includes, for example, a first resistance element to which the predetermined voltage is applied, and a variable resistor that is connected in series to the first resistance element and sets an analog voltage value.
The ID information selection means is realized as a lock mechanism that can selectively set the variable resistor to a plurality of predetermined resistance values by giving a selective sliding resistance to the sliding piece of the variable resistor. The

Further, the voltage dividing circuit is configured as, for example, a first resistance element to which the predetermined voltage is applied, and a variable resistor that is connected in series to the first resistance element and sets an analog voltage value,
The ID information selection means may be realized as a display that is lit and driven by receiving an ID information identification signal output from the microcomputer when the microcomputer identifies the ID information.

  In this case, the microcomputer may be configured to identify ID information and output an ID information identification signal when the analog voltage value is included in a plurality of predetermined voltage ranges determined in advance.

  According to the ID information setting circuit configured as described above, the ID information can be converted into an analog voltage value simply by selectively setting the voltage dividing ratio of the voltage dividing circuit by selecting the switch circuit or sliding the variable resistor. It can be given to the A / D conversion port of the microcomputer. In addition, the ID information set in the electronic device can be easily recognized from the operating state of the switch circuit and the setting position of the sliding piece indicated by, for example, the rotation angle of the variable resistor. In this case, it is desirable to attach a scale indicating the set position of the sliding piece to the variable resistor.

Further, since ID information is given by using an A / D conversion port provided in the microcomputer, for example, 2 ⁿ corresponding to the conversion bit number n of the A / D converter of the microcomputer using one interface wiring. It is possible to set stage ID information. Therefore, it is suitable for application to a small-scale data collection system using a microcomputer.

1 is a diagram showing a schematic configuration of an ID information setting circuit according to a first embodiment of the present invention. The figure which shows the relationship between the resistance value of a voltage dividing circuit with voltage selection operation, and voltage dividing ratio. The figure which shows the change of the analog voltage value set by switch selection operation. The figure which shows schematic structure of the ID information setting circuit which concerns on the 2nd Embodiment of this invention. The figure which shows the change of the A / D conversion value with respect to the analog voltage set by operation of a variable resistor. The figure which shows the structural example of the variable resistor used by the 2nd Embodiment of this invention. The figure which shows schematic structure of the ID information setting circuit which shows the 3rd Embodiment of this invention. The figure which shows the change of the analog voltage A / D conversion value set using a variable resistor, and the lighting range of LED. The figure which shows the lighting threshold value of LED with respect to an A / D conversion value. The figure which shows the structural example of the conventional ID information setting circuit which sets ID information using a switch element.

  Hereinafter, an ID information setting circuit according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of an ID information setting circuit 10 according to the first embodiment of the present invention. The ID information setting circuit 10 is configured to generate ID information set for each electronic device as an analog voltage value and supply the analog voltage value to the A / D conversion port 6 of the microcomputer 4. Specifically, the ID information setting circuit 10 changes the analog voltage value that is divided and output by the voltage dividing circuit 11 by selectively setting the voltage dividing circuit 11 and the voltage dividing ratio of the voltage dividing circuit 11. ID information selection means 12 for setting.

  Incidentally, the ID information selection means 12 includes, for example, four switch elements 13a, 13b, 13c, and 13d in parallel, and each switch element 13a, 13b, 13c, and 13d can be turned on and off individually.・ It consists of switches. The voltage dividing circuit 11 includes, for example, a first resistance element 14 to which a predetermined voltage Vcc is applied at one end, and a plurality of second resistance elements 15a connected in series to the other end of the first resistance element 14. , 15b, 15c, 15d. The switch elements 13a, 13b, 13c, 13d are selectively grounded at the other ends of the second resistance elements 15a, 15b, 15c, 15d, so that the second resistance elements 15a, 15b, 15c, 15d is connected in series to the first resistance element 14.

  Incidentally, the resistance value R1 of the first resistance element 14 is set to 10 kΩ, for example. In contrast, the resistance values R2, R3, R4, and R5 of the second resistance elements 15a, 15b, 15c, and 15d are set to different values, for example, 4.7 kΩ, 10 kΩ, 20 kΩ, and 39 kΩ. That is, the resistance values R2, R3, R4, and R5 of the second resistance elements 15a, 15b, 15c, and 15d are determined to have a resistance value ratio relationship that is approximately twice in order.

  The switch elements 13a, 13b, 13c, and 13d selectively connect the second resistor elements 15a, 15b, 15c, and 15d in series with the first resistor element 14 by their selective on / off operations, As a result, the voltage dividing ratio of the voltage Vcc in the voltage dividing circuit 11 is variably set. By the variable setting of the voltage dividing ratio, the analog voltage value output from the voltage dividing circuit 11 is variably set and given to the microcomputer 4 as ID information.

  Here, the voltage dividing ratio and analog voltage value of the voltage dividing circuit 11 set by the selective on / off operation of the switch elements 13a, 13b, 13c, and 13d will be described. When the switch elements 13a, 13b, 13c, and 13d are sequentially turned on / off according to the binary 4-bit value, for example, as shown in FIG. 2, the second resistor connected in series to the first resistance element 14 The combined resistance value of the resistance elements 15a, 15b, 15c, and 15d changes to infinity, 39 kΩ, 20 kΩ, 13.22 kΩ,..., 2.57 kΩ.

  Specifically, when all of the switch elements 13a, 13b, 13c, and 13d are off (0) as shown as a switch operation state [1 (0 in hexadecimal notation)], the voltage Vcc is directly used as an analog voltage value. Is output. When only the switch element 13d is on (1) as shown in the switch operation state [2 (1 in hexadecimal notation)], the voltage is divided by the first resistor element 14 and the second resistor element 15d. A voltage of 0.80 times the voltage Vcc is output as an analog voltage value. When only the switch element 13c is on as shown as a switch operation state [3 (2 in hexadecimal notation)], the voltage divided by the first resistor element 14 and the second resistor element 15c is used. A voltage 0.67 times the voltage Vcc is output as an analog voltage value.

  Further, when only two of the switch elements 13c and 13d are on as shown as a switch operation state [4 (3 in hexadecimal notation)], the first resistor element 14 and the second resistor element 15c A voltage 0.57 times the voltage Vcc divided by the combined resistance (13.22 kΩ) of the second resistance element 15 d is output as an analog voltage value.

  The change in the analog voltage value output from the voltage dividing circuit 11 in accordance with the selective ON / OFF operation of the switch elements 13a, 13b, 13c, and 13d is as shown in FIG. 3, for example. When all of the switch elements 13a, 13b, 13c, and 13d are on as shown as a switch operation state [16 (F in hexadecimal notation)], the analog voltage value is 0.20 times the voltage Vcc. Minimum voltage.

  Here, assuming that an A / D converter (not shown) built in the microcomputer 4 has a resolution of 10 bits, the number of effective digits of the A / D converter is 0 to 1024 digits. As described above, the analog voltage value set by the ID information setting circuit 10 changes within the range of a maximum of 1024 digits and a minimum of 210 digits in the A / D converter. Accordingly, the microcomputer 4 identifies the A / D conversion value of the A / D converter, thereby setting the analog voltage value given from the ID information setting circuit 10 and thus the setting of the switch elements 13a, 13b, 13c, 13d. It becomes possible to recognize the state as ID information.

  When the resistance values R2, R3, R4, and R5 of the second resistance elements 15a, 15b, 15c, and 15d are set as 39 kΩ, 20 kΩ, 10 kΩ, and 4.7 kΩ, for example, 0 to F in hexadecimal display Even if the switch elements 13a, 13b, 13c, and 13d are sequentially turned on / off according to the given set value, the combined resistance value does not simply change with respect to the change in the set value. Accordingly, in such a case, for example, the switching elements 13a, 13b, 13c, and 13d are turned on / off according to the resistance values R2, R3, R4, and R5 of the second resistance elements 15a, 15b, 15c, and 15d. Change off order. Specifically, the order in which the switch elements 13a, 13b, 13c, and 13d are turned on / off is expressed in, for example, hexadecimal display [0, 8, 4, C, 2, A, 6, E, 1, 9, 5 , D, 3, B, 7, F], the analog voltage value can be changed monotonously as shown in FIG.

  Here, even if the on / off order of the switch elements 13a, 13b, 13c, and 13d is devised so that the analog voltage value changes monotonically, the change in the analog voltage value does not become linear. Incidentally, if the change in the analog voltage value is linear, the individual set values in the microcomputer 4 can be easily identified. However, in reality, it is difficult for the ID information setting circuit 10 shown in FIG. 1 to make the change of the analog voltage value linear with respect to the set values of the switch elements 13a, 13b, 13c, and 13d.

  However, as described above, the setting values for the switch elements 13a, 13b, 13c, and 13d and the analog voltage values obtained thereby have a one-to-one correspondence. If the converter has a resolution of, for example, 10 bits, it is possible to reliably recognize the operation state of the switch elements 13a, 13b, 13c, and 13d, that is, ID information, from the A / D conversion value. In practice, there is no problem. In addition, the ID information set in the ID information setting circuit 10 can be easily confirmed by visual observation from the operating states of the switch elements 13a, 13b, 13c, and 13d. Furthermore, since the ID information is only given to the A / D conversion port 6 of the microcomputer 4 as an analog voltage value, the effect is that the interface wiring can be simplified to one.

  FIG. 4 is a schematic configuration diagram of an ID information setting circuit 20 according to the second embodiment of the present invention. The ID information setting circuit 20 sets ID information using a variable resistor 22 instead of the switch elements 13a, 13b, 13c, and 13d described above. That is, the ID information setting circuit 20 performs voltage division by a first resistance element 21 to which a predetermined voltage Vcc is applied at one end and a variable resistor 22 connected in series to the first resistance element 21 and grounded. A circuit 23 is configured. Then, the voltage dividing ratio of the voltage dividing circuit 23 is variably set by adjusting the resistance value of the variable resistor 22, whereby the operation amount of the variable resistor 22, specifically, the slider of the variable resistor 22 is set. An analog voltage value corresponding to the rotation angle is generated as ID information.

  Specifically, the first resistance element 21 is a fixed resistor of 10 kΩ, and the variable resistor 22 is a so-called trimmer resistor whose resistance value can be variably set in a range of 0 to 10 kΩ. The ID information setting circuit 20 changes the analog voltage value output from the voltage dividing circuit 23 by variably setting the resistance value of the variable resistor 22, and uses the analog voltage value as ID information to the microcomputer 4. Output. Incidentally, the change in the analog voltage value accompanying the operation of the variable resistor 22, that is, the change in the A / D conversion value in the microcomputer 4, is, for example, a resistance set in the variable resistor 22 as shown in FIG. It corresponds to the value.

  Specifically, when the variable resistor 22 is set to a minimum value of 0Ω, the analog voltage value is 0V, and when the variable resistor 22 is set to a maximum value of 10 kΩ, the first resistor element 21 and The voltage Vcc is divided to [Vcc / 2] V. Therefore, if the A / D converter built in the microcomputer 4 has a resolution of 10 bits, for example, it is possible to recognize the analog voltage value in a range from a maximum of 512 digits to a minimum of 0 digits. The analog voltage value set by the variable resistor 22 can be easily confirmed by visually recognizing the operation amount indicated as the rotation angle of the slider in the variable resistor 22.

  Incidentally, for example, as shown in FIG. 6, the variable resistor 22 protrudes from a case 25 of an electronic device in which the ID information setting circuit 20 is incorporated with a rotating shaft 24 that slides a slider 22 a of the variable resistor 22. Provided. Then, by rotating the operation knob 26 attached to the tip of the rotary shaft 24, the resistance value of the variable resistor 22 is set in accordance with the rotation angle that is the operation amount of the operation knob 26. Is provided.

  Here, the case 25 of the electronic device is provided with a plurality of indexes 27 composed of numerical values [1] to [10] indicating the rotation angle of the operation knob 26. The resistance value of the variable resistor 22 is alternatively set by selectively matching a marker 26a attached to the operation knob 26 to one of these indexes 27. Further, the rotating shaft 24 is provided with a protrusion 24a for defining a rotational operation position of the rotating shaft 24, for example. The case 25 is provided with a plurality of fitting recesses 25a as stopper mechanisms for fitting into the protrusions 24a to define the rotational operation position of the rotary shaft 24.

  The variable resistor 22 provided in this way constitutes ID information selecting means for selectively setting the voltage dividing ratio of the voltage dividing circuit 23. The rotation shaft 24 of the variable resistor 22 is rotated by a predetermined rotation angle with a predetermined click feeling by the fitting of the protrusion 24a and the fitting recess 25a. Then, the resistance value of the variable resistor 22 is selectively set to a predetermined resistance value for each operation position of the operation knob 26 indicated by the index 27, in other words, for each rotation position of the rotary shaft 24.

  Thus, according to the variable resistor 22 incorporated in the electronic device, the ID information setting circuit 20 is set only by selectively matching the marker 26a of the operation knob 26 to one of the plurality of indexes 27. The analog voltage value to be set can be easily set as the ID information of the ID information setting circuit 20. Further, the ID information set in the electronic device can be easily visually recognized from the index 27 to which the marker 26a of the operation knob 26 is combined. Accordingly, the same effects as those of the first embodiment described above can be obtained. Further, as compared with the first embodiment, the voltage dividing circuit 23 and the ID information are not required because the plurality of second resistance elements 15a, 15b, 15c, 15d and the switch elements 13a, 13b, 13c, 13d are not required. There is an advantage that the selection means can be configured easily.

  By the way, it is also possible to provide a display for confirming the setting of ID information, for example, the LED 28 in the electronic device so that the setting of a predetermined analog voltage value can be confirmed. FIG. 7 is a schematic configuration diagram of a main part according to the third embodiment of the present invention configured as described above. A voltage dividing circuit 23 that generates an analog voltage value as ID information is the same as that of the second embodiment. The first resistor element 21 and the variable resistor 22 are included.

  Particularly in this embodiment, the LED 28 is provided, for example, in the vicinity of the operation knob 26. The ID information setting circuit 30 turns on the LED 28 by using an ID information identification signal output from the I / O port 7 of the microcomputer 4 when the microcomputer 4 detects a predetermined analog voltage value. Configured to drive. In the third embodiment, no click feeling is given to the operation of the operation knob 26 for the variable resistor 22. When the LED 28 is turned on, the analog voltage value is selected and set by stopping the operation knob 26 at the operation position.

  In this case, in the microcomputer 4, for example, as shown in FIG. 8, when the analog voltage value becomes an A / D conversion value indicating a predetermined voltage value, the microcomputer 4 is connected via the I / O port 7. The ID information identification signal for driving the LED 28 to turn on is output. Specifically, for example, as shown in FIG. 9, an A / D conversion value obtained by identifying the analog voltage value with respect to a theoretical A / D conversion value for a set value of ID information allows for a predetermined deviation. The ID information identification signal is output via the I / O port 7 when included in the normal setting determination range.

  According to the ID information setting circuit 30 configured as described above, the operation knob 26 is rotated according to the index 27, and when the LED 28 is lit, the rotation operation of the operation knob 26 is stopped. It is possible to easily set the analog voltage value at the level indicated by the index 27. That is, in this embodiment, the LED 28 functions as ID information selection means. The ID information associated with the analog voltage value can be easily visually recognized from the index 27 to which the marker 26a of the operation knob 26 is combined. Accordingly, the same effects as those of the second embodiment described above can be obtained.

  Further, whether or not an analog voltage value that can be clearly identified by the microcomputer 4 is set according to whether or not the LED 28 is turned on when the variable resistor 22 is operated to the position indicated by the index 27. Can be easily visually recognized. In other words, by operating the variable resistor 22 so that the LED 28 is turned on, the resistance value of the variable resistor 22 can be easily variably set when selecting and setting ID information including a desired analog voltage value. It becomes possible to do. Therefore, effects such as the ability to easily and accurately set analog voltage values that define a plurality of ID information can be achieved.

  The present invention is not limited to the embodiment described above. For example, in the first embodiment, an analog voltage value corresponding to a 4-bit set value is set as ID information, but the number of set values (number of bits) may be determined according to specifications. In the second and third embodiments, the analog voltage value as the ID information is set as 10 levels, but it is sufficient to determine the number of levels according to the specification.

  Further, various modifications can be made to the method of giving a click feeling to the operation of the variable resistor 22 and, of course, a linear slide type variable resistor can be used instead of the rotary type variable resistor 22. Furthermore, a marker may be provided on the case 25 of the electronic device, and a plurality of indicators may be provided on the operation knob 26 itself. Further, here, a system for collecting data from a plurality of electronic devices connected to the microcomputer 4 has been described as an example, but the present invention is also applicable to a network system for communicating information between a plurality of electronic devices and the microcomputer 4. Is applicable as well. In addition, the present invention can be variously modified and implemented without departing from the scope of the invention.

4 Microcomputer 10, 20, 30 ID information setting circuit 11 Voltage dividing circuit 12 ID information selection means 13a, 13b, 13c, 13d Switch element 14 First resistance element 15a, 15b, 15c, 15d Second resistance element 21 Resistance Element 22 Variable resistor (ID information selection means)
22a Slider 23 Voltage dividing circuit 24 Rotating shaft 24a Projection 25 Case 25a Fitting recess 26 Operation knob 26a Marker 27 Index 28 LED (display; ID information selection means)

Claims (3)

An ID information setting circuit that is provided in each of a plurality of electronic devices connected to a microcomputer and sets different ID information for each electronic device,
A voltage dividing circuit for setting ID information given to the microcomputer as an analog voltage value obtained by dividing a predetermined voltage;
ID information selection means for variably setting the voltage dividing ratio of the voltage dividing circuit ;
Equipped with,
The voltage dividing circuit includes a first resistance element to which the predetermined voltage is applied, and a variable resistor that is connected in series to the first resistance element and sets an analog voltage value.
The microcomputer identifies ID information and outputs an ID information identification signal when the analog voltage value is included in a plurality of predetermined voltage ranges determined in advance,
The ID information selection circuit, wherein the ID information selection means includes a display that is lit and driven in response to the ID information identification signal output from the microcomputer. The resistance value of the variable resistor changes according to the operation amount of the operation knob,
The ID information setting circuit is housed in a case, and the case is provided with a plurality of indicators indicating the operation amount of the operation knob, and the operation knob is provided with a marker. The ID information setting circuit according to claim 1. The resistance value of the variable resistor changes according to the operation amount of the operation knob,
The ID information according to claim 1, wherein the ID information setting circuit is housed in a case, the case is provided with a marker, and the operation knob is provided with a plurality of indexes. Setting circuit.