JP2000097783A - Microcomputer type heat sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent omission of report and inoperativeness of a fire warming lamp, etc., caused by wrong connection polarity at a signal processing part and sensor part, by providing a signal processing part where the connection polarity of a sensor part is discriminated and an alert is outputted if the connection polarity is reversal. SOLUTION: The micro computer type heat sensor comprises a sensor part 2 where a temperature detecting element RTH and a fire warning lamp LED are connected in parallel and a signal processing part 1 comprising input/output control ports PORT1-4 and an A/D conversion circuit 12. The signal processing part 1 discriminates connection polarity of the sensor part 2, and if the connection polarity is correct, it takes in the signal from the sensor part 2 through the input/output control port under the condition for discriminating occurrence of a fire. Meanwhile, the signal processing part 1 outputs an alarm if the connection polarity of the sensor part 2 is reversal. Thus, an erroneous connection is easily known through an ear without test operation. Further, it is easily discriminated visually through illumination of flashing of a fire warning lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a microcomputer type heat sensor having a microcomputer as a signal processing unit.

[0002]

2. Description of the Related Art A microcomputer type heat sensor 103 of this kind is
It has a configuration as shown in FIG.
Is compared with a reference value prepared in advance by a signal processing unit 100 composed of a microcomputer, and when the temperature data exceeds the reference value, a fire signal is transmitted to the receiver 104, and at the same time, Fire confirmation lamp 10
By lighting 2, the fact that the alarm has been issued is also notified at the site. The receiver 104 that has received the fire signal determines whether or not it is a real fire, and then outputs an alarm to notify the user. It has become. FIG. 10 shows a connection mode between the sensor unit 101 and the signal processing unit 100. The sensor unit 101 has connection terminals a and b, and the signal processing unit 100 corresponds to the connection terminals a and b. Since the connection terminals (plugs) A and B are provided, the sensor unit 101 connects the connection terminals a and b to the signal processing unit 10.
The microcomputer-type heat detector is constructed by inserting the connection terminals (plugs) A and B corresponding to 0 in FIG. FIG. 11 (a),
(B) shows an electrical connection circuit between the sensor unit and the signal processing unit of the microcomputer type heat sensor. Sensor unit 101
, A thermistor RTH for temperature detection and an LED constituting a fire confirmation lamp are connected in the directions shown in the figure, and the sensor unit 101 and the signal processing unit 100 are normally connected as shown in FIG. Is used in the simple connection relations aA and bB.

A microcomputer constituting the signal processing unit 100 includes input / output control ports 1-4 (PO) to the A / D conversion circuit 12, the power supply terminal VDD, and the ground terminal GND.
RT1 to RT), a temperature detecting resistor R1 and a current limiting resistor R2 are additionally connected to the ports 1 and 2, respectively, and the port 3 is connected to the A / D conversion circuit 12.
In such a microcomputer-type heat sensor, the temperature data is taken in from the sensor unit 101 by variously changing the port setting conditions, the fire confirmation lamp LED is turned on when a fire is determined, and the signal processing unit 100 is connected to the microcomputer. By applying a constant voltage to a temperature detection circuit configured by connecting a thermistor RTH connected between ports 1 and 4 and the temperature detection resistor R1 in series among the input and output control ports, the thermistor RTH is applied to the thermistor RTH. The generated voltage is taken into the A / D conversion circuit 12 as temperature data, converted into a digital signal, and then compared with a prepared fire determination level (reference level). Then, the signal processing unit 100
If the temperature data exceeds or falls below the fire determination level, it is determined that a fire has occurred, a fire signal is transmitted to the receiver 104, and the fire confirmation lamp LED is turned on at the same time. . In the signal processing unit 100,
A temperature measurement routine for taking temperature data from the sensor unit 101 to perform temperature measurement and a fire determination routine for determining a fire are executed as programs. In these routines, the equivalent circuits shown in FIGS. As shown, necessary control is performed by variously changing the port setting conditions. By the way, it should be noted that in such a microcomputer type heat sensor, since the sensor unit 101 employs an LED having a connection polarity as a fire confirmation lamp, a signal composed of the sensor unit 101 and the microcomputer is used. The connection relationship with the processing unit 100 is that various problems occur in the operation of the heat detector unless the connection is in a corresponding connection form as shown in FIG.

[0004] Next, a problem caused by an incorrect connection polarity between the sensor unit and the signal processing unit will be described. First, the connection mode between the signal processing unit 100 and the sensor unit 101 is shown in FIG.
Assume that Aa and Bb are connected to correct polarities as shown in FIG. After performing the initial setting, the signal processing unit 100 executes a temperature measurement routine. In this temperature measurement routine, the port 1 is set to H and the port 4 is set to L
At this time, the port 2 is opened to cut off the power supply to the LED. Then, thermistor RT from port 3
The voltage generated at H is taken into the A / D conversion circuit 12. The fetched voltage is converted into a digital signal as temperature data, a fire determination routine is executed, and compared with a fire determination level prepared in advance. As a result of the comparison, if the temperature data does not reach the fire judgment level, the fire confirmation lamp L
Port setting is performed to turn off the ED. That is,
The port 4 is set to L and the port 2 is set to L to cut off the power supply to the LED. At this time, the ports 1 and 3 are open. On the other hand, if the temperature data exceeds the fire determination level, it is determined that a fire has occurred, and a fire signal is sent to the fire receiver 104. At the same time, port setting is performed to turn on the fire confirmation lamp LED. That is, port 4 is set to H,
The port 2 is set to L, and the LED is energized. At this time, port 1 and port 3 are open.

Next, a signal processing unit 100 and a sensor unit 101
It is assumed that the connection polarity is reversed, and the connection is made to Ab and Ba as shown in FIG. The microcomputer constituting the signal processing unit 100 executes the same program as when the connection is correct. That is, the temperature measurement routine is executed, the port 1 is set to H, the port 4 is set to L, and the port 2 is opened at this time. However, in this port setting, since a forward voltage is applied to the LED connected in parallel to the thermistor RTH, the LED is energized and turned on, and the voltage taken in from the port 3 has a lower resistance than the thermistor RTH. The LED is held at the forward voltage drop level VF, and the temperature change cannot be detected. As a result, even if the signal processing unit 100 executes the fire determination routine for comparing the temperature data taken from the sensor unit 101 with the fire determination level, the signal cannot be determined. If port setting is performed to turn on LED, port 4 becomes H and port 2 becomes L. At this time, port 1 and port 3 are open. In this state, LED is reverse biased and LED can be energized. Therefore, the fire confirmation lamp LED cannot be turned on, and the heat detector
It becomes inoperable.

[0006]

Therefore, in such a microcomputer type heat sensor, when the connection polarity between the sensor section and the signal processing section is wrong, the temperature cannot be measured and it is determined that a fire has occurred. There is no fire confirmation lamp, but the fire confirmation lamp does not light up even if it is judged to be a fire.
And other problems. The present invention has been made in view of such problems, and has been able to solve problems such as a false alarm due to an incorrect connection polarity between a signal processing unit and a sensor unit, and a malfunction of a fire confirmation lamp. It is intended to provide a type heat sensor.

[0007]

In order to achieve the above object, the present invention proposes a microcomputer type heat sensor having the following configuration. The present invention according to claim 1 includes a sensor unit in which a temperature detection element and a fire confirmation lamp having a connection polarity are connected in parallel, a connection unit for connecting the sensor unit, an input / output control port, and an AD conversion unit. And a signal processing section including a microcomputer.The signal processing section determines the connection polarity of the sensor section, and if the connection polarity is correct, the signal processing section determines the connection polarity in the state of the connection polarity. While taking in the signal from the sensor unit through the output control port to determine the occurrence of fire,
If the connection polarity is reversed, an alarm is output. According to the present invention of claims 2 and 3, a fire confirmation lamp which is lit and held at the time of a fire judgment is turned on or blinks at the time of erroneous connection. Further, when the signal processing unit determines that the connection polarity is opposite to the sensor unit, the wrong connection warning lamp is turned on or blinks.

According to a fifth aspect of the present invention, there is provided a sensor unit in which a temperature detecting element and a fire confirmation lamp having a connection polarity are connected in parallel, a connection unit for connecting the sensor unit, an input / output control port, and an AD converter. A microcomputer-type heat sensor including a signal processing unit including a microcomputer having a unit, the connection unit includes a connection conversion circuit that changes a connection polarity between the sensor unit and the signal processing unit, The signal processing unit determines the connection polarity of the sensor unit. If the connection polarity is correct, the signal processing unit receives a signal from the sensor unit through the input / output control port and determines whether a fire has occurred while the connection state is correct. If the connection polarity is, the connection conversion circuit is operated to switch the connection polarity of the sensor unit to the correct connection polarity.

According to a sixth aspect of the present invention, in the fifth aspect,
The connection conversion circuit is characterized by being constituted by a cross-type switching circuit. According to a seventh aspect of the present invention, there is provided a sensor unit in which a temperature detection element and a fire confirmation lamp having a connection polarity are connected in parallel, a connection unit for connecting the sensor unit, an input / output control port, and an AD conversion unit. In a microcomputer type heat sensor including a signal processing unit including a microcomputer, the signal processing unit determines the connection polarity of the sensor unit, and according to the determined connection polarity,
After selectively changing the mode for taking in signals from the sensor unit and the arithmetic processing through the input / output control port,
It is configured to determine whether a fire has occurred.

According to an eighth aspect of the present invention, in the first aspect of the present invention, the sensor section has a structure having connection terminals detachable from the connection section, so that the sensor section can be easily attached and detached during assembly. And The invention of claim 9 is
In any one of claims 1 to 8, the fire confirmation lamp is L
It is characterized by being constituted by an ED.

According to a tenth aspect of the present invention, in the first aspect, the AD converter connects the temperature detecting element of the sensor unit to a detection resistor connected to an output control port of the microcomputer. It is characterized in that a voltage generated in the temperature detection circuit configured by this is converted into a digital signal.

[0012]

According to the first aspect of the present invention, the signal processing unit determines the connection polarity between the signal processing unit and the sensor unit. If the connection polarity is opposite, the signal processing unit outputs an alarm. Even if a test operation is not performed, it is possible to easily know by mistake that the connection is incorrect. According to the second to fourth aspects of the present invention, it is possible to easily determine incorrect connection through visual recognition by turning on or blinking the incorrect connection alarm lamp.

According to the fifth aspect of the present invention, when the signal processing unit determines that the connection polarity of the sensor unit is opposite, the signal processing unit operates the connection change circuit to change the connection polarity of the sensor unit to the correct connection polarity. Can be switched. According to the sixth aspect of the present invention, the software for automatically determining the connection polarity of the sensor unit, and changing the input mode of the signal from the sensor unit, the signal capture mode through the output control port, and the arithmetic processing in accordance with the determined connection polarity. It can be handled only by processing.

[0014]

Embodiments of the present invention will be described below. 1 and 2 show an embodiment of a microcomputer type heat sensor according to the present invention. 1 shows the case where the connection polarity between the sensor unit and the signal processing unit is correct, and FIG. 2 shows the case where the connection polarity between the sensor unit and the signal processing unit is reversed. In these figures, a signal processing unit 1 includes a microcomputer 11 (hereinafter abbreviated as a microcomputer), an A / D
It has a conversion circuit 12 and connection portions A and B. Microcomputer 1
1 is provided with a power supply terminal VDD, a ground terminal GND, input and output control ports 1 to 4 (PORTs 1 to 4), and further connects an erroneous connection alarm lamp 14. When the signal processing unit 1 determines that the connection polarity of the sensor unit 2 is reversed, the signal processing unit 1 can notify the fact by lighting or blinking the misconnection alarm lamp 14.
Here, port 1 is a temperature detection resistor R used for temperature measurement.
1, and the port 2 is connected to the connection terminal A via a current limiting resistor R2.
The port 3 is connected to the AD conversion circuit 12 and connected to the connection terminal A, and the port 4 is connected to the connection terminal B. Here, the temperature detection resistor R1 and the current limiting resistor R2 are
One that satisfies the condition of R1 ≠ R2 is adopted.

The sensor section 2 has connection sections a and b corresponding to the connection sections A and B. The connection sections a and b include an LED as a fire confirmation lamp and a thermistor as a temperature detection element. RTHs are connected in parallel. FIG. 3 is a flowchart showing an outline of a connection polarity automatic determination program executed in the microcomputer type heat sensor.
Steps S1 to S3 and steps S4 to S6 are routines for fetching temperature data while changing the port setting conditions, respectively. In step S7, steps S1 to S3 are performed.
And the temperature data D stored in the RAM
1 and fetched in steps S4 to S6 and stored in the RAM
In step S8, it is determined whether or not the difference ΔD = D1-D2 is zero, and the connection polarity is determined. That is,
Based on the principle described later, if ΔD = 0, it is determined that the connection polarity is correct, and if ΔD = 0, it is determined that the connection is reversed. Then, in this example, if the connection polarity is correct, the next temperature data is taken in without any processing, and the same comparison determination is repeatedly performed, but when it is determined that the connection polarity is reversed. Goes to step S9 and turns on the fire confirmation lamp. When the signal processing unit 1 determines that the connection polarity is opposite, when the fire confirmation lamp LED is turned on and held, there is no need to turn on or blink the incorrect connection alarm lamp 14 shown in FIGS. 1 and 2. The number of parts can be reduced. In such a device, the fire confirmation lamp is turned on immediately after the sensor unit 2 is connected to the signal processing unit 1 and the power is turned on, so that it is easy to determine. In this case, the lighting mode may be made to blink instead of holding the light, and in this case, it is desirable to make the blink cycle extremely fast or slow (see claims 2 and 3). . Next, the principle of discrimination by the automatic discrimination program shown in FIG. 3 will be described based on the case where the connection mode is correct and the case where it is reversed. As shown in FIG. 1, when the connection terminals a and b of the sensor unit are connected to the connection terminals A and B of the signal processing unit, the following results are obtained. That is, in the port setting condition in step S1, since port 1 is H, port 4 is L, and port 2 is open, the LED is reverse-biased, and the temperature detection circuit formed by the thermistor RTH and the temperature detection resistor R1 is used. A current flows, and a voltage generated in the thermistor RTH is taken into the A / D conversion circuit 12. Therefore,
The temperature data in this case is D1 = VDD × RTH / (R
TH + R1). On the other hand, in the port setting condition in step S4, since the port 2 is H, the port 4 is L, and the port 1 is open, the LED is also reverse-biased, and a current is supplied to the circuit composed of the thermistor RTH and the temperature detection resistor R2. Flows, and therefore, of the circuit of the resistor R2 and the thermistor RTH, the thermistor RT
The voltage generated at H is taken into the A / D conversion circuit 12. Therefore, the temperature data in this case is D2 = VD
It is a digital value of D × RTH / (RTH + R2). Therefore, ΔD in this case is ΔD = D1−D2 = VDD × RTH / (RTH + R1)
−VDD × RTH / (RTH + R2) ≠ 0. However, as shown in FIG. 2, when the connection terminals a and b of the sensor unit are connected to the connection terminals B and A of the signal processing unit as shown in FIG. 2, the following result is obtained. In the port setting conditions in step S1, port 1 is H, port 4 is L,
Since port 2 is open, the LED becomes forward biased through the temperature detection resistor R1, and the thermistor RTH is set to L.
Short circuit due to forward voltage drop VF of ED. Therefore, the temperature data in this case is a digital value of D1 = VF. On the other hand, in the port setting conditions in step S4, since the port 2 is H, the port 4 is L, and the port 1 is open, the LED is also forward biased through the current limiting resistor R2, and the thermistor RTH causes the LED forward voltage drop ΔVF Short circuit. Therefore, the temperature data in this case is a digital value of D2 = VF. Therefore, ΔD in this case is ΔD = D1−D2 = V
F-VF = 0. As a result of the determination of ΔD in step S8, if ΔD ≠ 0, since the connection polarity is correct, the process returns to step S1 again, and the same port setting and determination of ΔD are performed. However, the result of determining ΔD in step S8 , ΔD
If = 0, the connection polarity is reversed, so that step S9
Proceed to and hold the fire confirmation lamp. In this case, the port setting is such that port 2 is set to H, port 4 is set to L, and ports 1 and 3 are opened, so that the voltage is not taken into the AD conversion circuit 12, and the LED is set to the current limiting resistor R.
Since the current flows through 2, the lighting is maintained in a safe state. FIGS. 4A and 4B show equivalent circuits in which the port setting conditions in steps S1 and S2 correspond to the connection mode.

Next, another embodiment of another microcomputer type heat sensor will be described. The feature of this sensor is that a connection changing circuit 15 is provided at a connection portion of the signal processing unit 1, and the signal processing unit 1 automatically determines the connection polarity, and then determines the connection polarity.
In this case, the connection polarity can be freely switched between forward and reverse without removing the sensor unit 2 from the signal processing unit 1 by outputting the control signal to the sensor unit 2. In FIG.
The microcomputer 11 constituting the signal processing unit is provided with a new port 5 (PORT5), and a switching signal is transmitted from this port 5 to the connection changing circuit 15. The connection change circuit 15 constitutes a cross-type switching circuit having transfer contacts SW1 and SW2.
b. FIG. 6 shows the basic operation procedure of the program executed by the microcomputer type heat sensor. The temperature data D1 and D2 are fetched by changing the setting conditions of the ports 1 to 4, and the difference ΔD Is calculated, and the basic procedure for determining whether it is 0 or not is the same as in the above-described example. After step S8 for determining ΔD, if ΔD ≠ 0, it is determined that the connection polarity is correct, and the port 5 is held at L to inhibit switching of the connection changing circuit 15, but when ΔD = 0, If there is, the connection polarity is determined to be opposite, and the connection changing circuit 15 is switched.

Finally, another embodiment of the microcomputer type heat sensor will be described. The basic configurations of the signal processing unit 1 and the sensor unit 2 are the same as those shown in FIGS. 1 and 2, but differ from FIG. 1 and FIG. 2 in that an incorrect connection alarm lamp is not provided.
The feature of this microcomputer type heat sensor is that the connection polarity between the signal processing unit 1 and the sensor unit 2 is automatically determined by software processing,
Further, according to the determined polarity, the mode for taking in the temperature data and the arithmetic processing are also changed.
The port setting conditions of the input and output control ports are changed according to the determined connection polarity. FIGS. 7 and 8 are flowcharts showing the basic operation procedure of the program executed in that case, and the automatic determination routine shown in steps S1 to S8 of FIG. 7 is the same as that described above.
In steps S11 to S22 in FIG. 8, the temperature is determined based on the connection polarity (shown as connection direction information in the flow of the figure) between the sensor unit 2 and the signal processing unit 1 determined by the automatic determination routine in FIG. The data acquisition mode has been changed, and the arithmetic processing of the acquired temperature data has been changed accordingly. In step S17, steps S16 and S1
The temperature data calculated in step 9 is compared with a previously prepared fire determination level, and as a result of the comparison, if it is determined that the fire is not a fire, the process proceeds to step S18, where the fire confirmation lamp LED is turned off to determine that a fire has occurred. In this case, steps S20, S21,
Proceeding to S22, the fire confirmation lamp LED is turned on and held by changing the setting condition of the port. With reference to FIG. 8, the principle employed in the microcomputer type heat sensor will be described in more detail. If it is determined by the automatic determination routine that the connection polarity between the sensor unit 2 and the signal processing unit 1 is correct, the port setting conditions take in temperature data in the same manner as described above. That is, the port 1 is set to H, the port 4 is set to L, the port 2 is set to open, the LED is reverse-biased, a voltage of a certain level is applied to the temperature detection circuit, and the thermistor R
A current flows through TH, and the voltage generated at the thermistor RTH at that time is taken in from port 3 as temperature data.

The temperature data D in this case is calculated as D = VDD × RTH / (RTH + R1) as described above. However, when the connection polarity is determined to be opposite by the automatic determination routine, the port setting condition is changed. That is, the port 1 is set to L, the port 4 is set to H, the port 2 is set to open, the LED is reverse-biased, a constant level voltage is applied to the temperature detection circuit, and a current flows through the resistor R1 to the thermistor RTH. Is taken in from port 3 as temperature data.

The temperature data D 'in this case is calculated as D' = VDD × R1 / (RTH + R1) as described above. The important thing here is when the former port setting condition,
The difference is that the temperature data taken into the A / D conversion circuit 12 of the signal processing unit 1 differs depending on the latter port setting condition. Therefore, in order to calculate the voltage generated in the thermistor RTH when it is determined that the connection polarity is opposite, D =
VDD−D ′ = VDD (1−R1 / (RTH + R1))
In the step, this value is calculated. With the above procedure, according to the determined connection polarity,
When the temperature data is calculated, the calculated temperature data is compared with a fire determination level prepared in advance. If the temperature data exceeds the fire determination level, it is determined that a fire has occurred, and the fire confirmation lamp is lit and held. That is, the port setting conditions at this time also differ based on the connection direction information. When the connection polarity is positive, the port 4 is set to H, the port 2 is set to L, the ports 1 and 3 are opened, and the LEDs are energized and lit. If the connection polarities are opposite, port 4 is L, port 2 is H, ports 1 and 3 are open, and the LEDs are energized and lit.

[0020]

According to the first aspect of the present invention, when the connection between the signal processing unit and the sensor unit is erroneously connected, an alarm is output, so that the erroneous connection is notified by ear, and the connection due to erroneous connection is lost. Alarms and fire alarm lamps can be disabled. In particular, according to the second to fourth aspects of the present invention, erroneous connection can be easily distinguished by ear and vision.

According to the fifth aspect of the present invention, as a result of automatically determining the positive and reverse polarities of the connection between the signal processing unit and the sensor unit,
Since the connection change circuit provided in the signal processing unit can be operated to switch to the correct connection polarity, the operation required for incorrect connection is not required, and a highly reliable heat sensor can be provided. According to the sixth aspect of the present invention, the connection polarity of the sensor unit connected to the signal processing unit is automatically determined, the temperature data is calculated according to the determined connection polarity, and at the time of fire determination, , Can turn on the fire confirmation lamp. Therefore, it is possible to cope with an erroneous connection without adding a hardware configuration such as a connection changing circuit, so that a highly reliable heat sensor that is easy to operate can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic circuit configuration diagram of a microcomputer type heat sensor (when connection polarity is correct) according to claim 1 of the present invention.

FIG. 2 is a schematic circuit configuration diagram of a microcomputer-type heat sensor of the present invention (when the connection polarity is reversed).

FIG. 3 is a flowchart showing a basic operation of the microcomputer type heat sensor of the present invention.

FIGS. 4A and 4B are equivalent circuit diagrams in a case where normal and reverse connections are made when port setting conditions are changed in a temperature measurement routine.

FIG. 5 is a schematic circuit configuration diagram of a microcomputer-type heat sensor according to claim 3 of the present invention.

FIG. 6 is a flowchart showing a basic operation of the microcomputer type heat sensor according to claim 3;

FIG. 7 is a flowchart showing a basic operation (connection polarity determination routine) of the microcomputer type heat sensor according to claim 5;

FIG. 8 is a flowchart showing a basic operation (temperature measurement, fire determination routine) of the microcomputer type heat sensor according to claim 5;

FIG. 9 is a conceptual explanatory diagram of a fire alarm system using a conventional microcomputer-type heat sensor.

FIG. 10 is a schematic explanatory diagram of connection terminals of a sensor unit and a signal processing unit of the microcomputer-type heat sensor.

FIGS. 11A and 11B are diagrams showing a connection mode between a sensor unit and a signal processing unit in a microcomputer-type heat sensor.

12A and 12B are equivalent circuit diagrams when a port condition in a microcomputer-type heat sensor is changed.

[Explanation of symbols]

 Reference Signs List 1 signal processing unit 2 sensor unit 11 microcomputer 12 A / D conversion circuit 13 connection unit 15 connection change circuit a, b connection terminal of sensor unit A, B connection terminal of signal processing unit LED fire confirmation lamp RTH temperature detection element (thermistor PORT1 to PORT5 input / output control port

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[Procedure amendment]

[Submission date] December 4, 1998 (1998.12.
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

[0012]

According to the first aspect of the present invention, the signal processing unit determines the connection polarity between the signal processing unit and the sensor unit. If the connection polarity is opposite, the signal processing unit outputs an alarm. Even if a test operation is not performed, it is possible to easily know by mistake that the connection is incorrect. According to the second to fourth aspects of the present invention, it is possible to easily determine that there is an erroneous connection visually by turning on or flashing the fire confirmation lamp or the erroneous connection alarm lamp.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

The sensor section 2 has connection sections a and b corresponding to the connection sections A and B. The connection sections a and b include an LED as a fire confirmation lamp and a thermistor as a temperature detection element. RTHs are connected in parallel. FIG. 3 is a flowchart showing an outline of a connection polarity automatic determination program executed in the microcomputer type heat sensor.
Steps S1 to S3 and steps S4 to S6 are routines for fetching temperature data while changing the port setting conditions, respectively. In step S7, steps S1 to S3 are performed.
And the temperature data D stored in the RAM
1 and fetched in steps S4 to S6 and stored in the RAM
In step S8, it is determined whether or not the difference ΔD = D1-D2 is zero, and the connection polarity is determined. That is,
Based on the principle described later, if ΔD = 0, it is determined that the connection polarity is correct, and if ΔD = 0, it is determined that the connection is reversed. Then, in this example, if the connection polarity is correct, the next temperature data is taken in without any processing, and the same comparison determination is repeatedly performed, but when it is determined that the connection polarity is reversed. Goes to step S9 and turns on the fire confirmation lamp. When the signal processing unit 1 determines that the connection polarity is opposite, when the fire confirmation lamp LED is turned on and held, there is no need to turn on or blink the incorrect connection alarm lamp 14 shown in FIGS. 1 and 2. The number of parts can be reduced. In such a device, the fire confirmation lamp is turned on immediately after the sensor unit 2 is connected to the signal processing unit 1 and the power is turned on, so that it is easy to determine. In this case, the lighting mode may be made to blink instead of holding the light, and in this case, it is desirable to make the blink cycle extremely fast or slow (see claims 2 and 3). . Next, the principle of discrimination by the automatic discrimination program shown in FIG. 3 will be described based on the case where the connection mode is correct and the case where it is reversed. As shown in FIG. 1, when the connection terminals a and b of the sensor unit are connected to the connection terminals A and B of the signal processing unit, the following results are obtained. That is, in the port setting condition in step S1, since port 1 is H, port 4 is L, and port 2 is open, the LED is reverse-biased, and the temperature detection circuit formed by the thermistor RTH and the temperature detection resistor R1 is used. A current flows, and a voltage generated in the thermistor RTH is taken into the A / D conversion circuit 12. Therefore,
The temperature data in this case is D1 = VDD × RTH / (R
TH + R1). On the other hand, in the port setting condition in step S4, since the port 2 is H, the port 4 is L, and the port 1 is open, the LED is also reverse-biased, and a current is supplied to the circuit composed of the thermistor RTH and the temperature detection resistor R2. Flows, and therefore, of the circuit of the resistor R2 and the thermistor RTH, the thermistor R
The voltage generated at TH is taken into the A / D conversion circuit 12. Therefore, the temperature data in this case is D2 = VD
It is a value obtained by digitizing D × RTH / (RTH + R2). Therefore, ΔD in this case is: ΔD = D1−D2 = VDD × RTH / (RTH + R1)
−VDD × RTH / (RTH + R2) ≠ 0. However, as shown in FIG. 2, when the connection terminals a and b of the sensor unit are connected to the connection terminals B and A of the signal processing unit as shown in FIG. 2, the following result is obtained. In the port setting conditions in step S1, port 1 is H, port 4 is L,
Since port 2 is open, the LED becomes forward biased through the temperature detection resistor R1, and the thermistor RTH is set to L.
Short circuit due to forward voltage drop VF of ED. Therefore, the temperature data in this case is a value obtained by digitizing D1 = VF. On the other hand, in the port setting conditions in step S4, since the port 2 is H, the port 4 is L, and the port 1 is open, the LED is also forward biased through the current limiting resistor R2, and the thermistor RTH causes the LED forward voltage drop ΔVF Short circuit. Therefore, the temperature data in this case is a digitized value of D2 = VF. Therefore, ΔD in this case is ΔD = D1−D2
= VF-VF = 0. As a result of discriminating ΔD in step S8, if ΔD ≠ 0, the connection polarity is correct, and the next processing (temperature measurement, etc.) is performed.
As a result of the determination of D, if ΔD = 0, the connection polarity is reversed, so the process proceeds to step S9, and the fire confirmation lamp is turned on and held. In this case, the port setting is such that the port 2 is set to H, the port 4 is set to L, and the ports 1 and 3 are opened, so that the voltage input to the AD conversion circuit 12 is prohibited, and the LED receives the current through the current limiting resistor R2. Since it flows, the lighting is maintained in a safe state. FIGS. 4A and 4B show equivalent circuits in which the port setting conditions in steps S1 and S4 correspond to the connection mode.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

According to the fifth aspect of the present invention, as a result of automatically determining the positive and reverse polarities of the connection between the signal processing unit and the sensor unit,
Since the connection change circuit provided in the signal processing unit can be operated to switch to the correct connection polarity, the operation required for incorrect connection is not required, and a highly reliable heat sensor can be provided. According to the seventh aspect of the present invention, the connection polarity of the sensor unit connected to the signal processing unit is automatically determined, the temperature data is calculated according to the determined connection polarity, and at the time of fire determination, , Can turn on the fire confirmation lamp. Therefore, it is possible to cope with an erroneous connection without adding a hardware configuration such as a connection changing circuit, so that a highly reliable heat sensor that is easy to operate can be obtained.

[Procedure amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Claims (10)

[Claims] 1. A sensor unit in which a temperature detecting element and a fire confirmation lamp having a connection polarity are connected in parallel, a connection unit connecting the sensor unit, an input / output control port, and an AD conversion unit. A signal processing unit including a microcomputer including the microcomputer.The signal processing unit determines the connection polarity of the sensor unit, and if the connection polarity is correct, the signal processing unit determines the connection polarity. , Through the output control port, the signal from the sensor unit is taken in to determine whether a fire has occurred, while if the connection polarity is reversed,
A microcomputer-type sensor that outputs an alarm. 2. The microcomputer type heat sensor according to claim 1, wherein the signal processing unit turns on or blinks a fire confirmation lamp when the sensor unit judges that the sensor unit has the opposite connection polarity. 3. The microcomputer type heat sensor according to claim 1, wherein when the signal processing section determines that the sensor section has the opposite connection polarity, the fire confirmation lamp is turned on and off at a cycle different from that of the fire determination. . 4. The apparatus according to claim 1, further comprising: a misconnection alarm lamp, wherein the signal processing unit turns on or blinks the misconnection alarm lamp when the sensor unit determines that the sensor unit has the opposite connection polarity. Microcomputer type heat sensor. 5. A sensor unit in which a temperature detection element and a fire confirmation lamp having a connection polarity are connected in parallel, a connection unit for connecting the sensor unit, an input / output control port, and an AD conversion unit. A microcomputer-type heat sensor including a signal processing unit including a microcomputer, wherein the connection unit includes a connection conversion circuit that changes a connection polarity between the sensor unit and the signal processing unit; The unit determines the connection polarity of the sensor unit. If the connection polarity is correct, the unit fetches a signal from the sensor unit through the input / output control port in the connection state to determine whether a fire has occurred. If so, a microcomputer-type sensor configured to operate the connection conversion circuit to switch the connection polarity of the sensor unit to the correct connection polarity. 6. The microcomputer type heat sensor according to claim 5, wherein said connection conversion circuit is constituted by a cross-type switching circuit. 7. A sensor unit in which a temperature detecting element and a fire confirmation lamp having a connection polarity are connected in parallel, a connection unit for connecting the sensor unit, an input / output control port, and an AD conversion unit. Microcomputer type heat sensor comprising a signal processing unit including a microcomputer
The signal processing unit determines a connection polarity of the sensor unit,
A microcomputer-type sensor configured to selectively change a mode for taking in a signal from a sensor unit and an arithmetic process through the input / output control port according to the determined connection polarity to determine whether a fire has occurred. 8. A microcomputer type heat sensor according to claim 1, wherein said sensor section has a connection terminal detachable from said connection section. 9. The microcomputer type heat sensor according to claim 1, wherein the fire confirmation lamp is constituted by an LED. 10. The temperature conversion device according to claim 1, wherein the AD conversion unit is configured by connecting a temperature detection element of a sensor unit to a detection resistor connected to an output control port of a microcomputer. A microcomputer-type heat sensor that converts the voltage generated in the detection circuit into a digital signal.