JPH0429419Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of the Invention] The present invention relates to a disconnection detection circuit, and detects a disconnection in the input line of a game machine management device that counts signals from a ball sensor, etc. installed in a game machine such as a pachinko machine. The present invention relates to a disconnection detection circuit used for detecting a disconnection.

[Background of the idea]

Recently, it has become common for pachinko parlors to use computers to manage various in-store data, such as the number of out and safe balls on pachinko machines, the number of balls handled on prize exchange machines, and sales data on ball lending machines. It's coming.

In this case, a ball sensor such as a switch is installed in the game machine, the prize exchange machine, the ball rental machine, etc. to detect the passing of out balls, safe balls, replacement balls, and rental balls, and the game machine management device is equipped with a signal line, that is, a counting input line. By counting the output of each ball sensor that is input through the ball sensor, each ball or amount data can be calculated.

By the way, if such a count input line is disconnected due to an accident or intentionally disconnected due to fraudulent activity, not only will correct data not be collected;
During this period, even if cash is stolen, it cannot be detected, causing a delay in detection and causing damage. Therefore, a need has arisen to detect disconnection of the input line. When a disconnection is detected, various processes are performed, such as generating an alarm, printing/displaying it, registering it in memory to indicate a decrease in data reliability, and sending information to the manager's house via communication. It is done. However, since the number of input points from which data must be collected in such a gaming machine conduit device is extremely large, there is a strong need to realize such a disconnection detection circuit at low cost.

[Purpose of invention]

In view of the problems with the conventional type described above, the present invention provides an inexpensive wire breakage detection circuit that detects signal line breakage from the side of an electronic device that receives binary signals via a signal line, such as a gaming machine management device. The purpose is to

[Structure and effect of the invention]

The present invention provides a circuit for detecting disconnection in a signal circuit including a switch means for generating a low impedance "1" level signal and a high impedance "0" level signal, and a signal line transmitting an output signal of the switch means. An input end of a general-purpose logic gate element is connected to the output end of the signal line, a first resistor is connected between the output end of the switch means and the high voltage side terminal of the DC power supply, and the signal line is connected to the input end of the general-purpose logic gate element. A second resistor is connected between the output end of the line and the low voltage side terminal of the DC power supply, and the voltage dividing ratio of the first and second resistors is set to the above value when the output of the switch means is at a low level. The potential of the signal line is set to be higher than the input threshold voltage of the general-purpose logic gate element, and the output level of the general-purpose logic gate element when the potential of the signal line becomes lower than the input threshold voltage. The present invention is characterized in that a disconnection of the signal line is detected.

Here, "low impedance "1" level signal" is a relatively high level signal that is output when the switch means is in a closed state and the switch means becomes low impedance when the switch means includes a switch etc. means. Furthermore, "high impedance "0" level signal" refers to a relatively low level signal that is output when a switch or the like is in an open state and the switch means is in a low impedance state.

According to the present invention having the above configuration, a bias voltage is applied to the signal line by resistor division, and when the voltage of the signal line changes to a level lower than this bias voltage, an inexpensive general-purpose logic gate element (for example, CMOS) is used.
Since detection is performed at the threshold level (input threshold voltage) of , it is possible to realize disconnection detection at a much lower cost than when using a general comparator.

[Explanation of Examples]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a disconnection detection circuit according to an embodiment of the present invention. In the figure, X is an input contact for counting, which is turned on (closed) once for each out ball as an out ball sensor for a pachinko machine, for example. As a result, a “1” level signal of voltage V ₁ is applied to the input terminal of the disconnection detection circuit 1 via the signal line 2 . In this disconnection detection circuit 1, in order to detect a disconnection between l, a resistor _R1 is connected in parallel with the contact X,
Together with the resistors R ₂ and R ₃ in the detection circuit 1, a closed loop is formed from the positive pole of the power supply V ₁ to the negative pole of the power supply V ₂ via the resistors R ₁ , R ₂ and R ₃ . IC ₁ and IC ₂ are inexpensive CMOS logic gate ICs, and here IC ₁
is used to detect disconnection, and IC ₂ is used to output pulses for counting. Resistor _R5 and capacitor C are an integrating circuit for absorbing contact X chattering.
D is when the power supply voltage V ₁ is higher than the rated voltage of IC ₁
This is a diode to protect the input terminal of IC ₁ .

Here, the threshold level of IC _{1, 2} is V _TH ,
Assuming that _the forward voltage _of diode _{D is V F} , _{R 1 and} R _{2 + R 3} are Set the resistance value.

Although this condition is not necessarily required, here, by setting the condition in this way, the resistance
The current flowing into resistors R ₂ and R ₃ via R ₄ is made zero to facilitate calculation of the input voltage of IC ₂ .

At this time, the input voltage of IC ₂ when contact X is “open” is V _IN2L
is V _IN2L = V ₁ × R ₃ / R ₁ + R ₂ + R ₃ .

The input voltage V _IN2H of IC ₂ when contact X is "open" is V _IN2H = V ₁ × R ₃ /R ₂ + R ₃ .

_The input voltage V _IN1H of IC ₁ when the two terminals are connected becomes V 2 from V ₁ × (R ₂ + R ₃ )/R ₁ + R ₂ + R ₃ ≧ (V ₂ −V _F ).

The input voltage V _IN1L of IC ₁ when either of the two terminals is open is V _IN1L = (V ₂ - V _F ) x (R ₂ + R ₃ )/R ₄ + R ₂ + R ₃ + V _F. .

Here, V _IN2L <V _TH −(2) V _IN2H >V _TH −(3) V _IN1L <V _TH −(4) and R ₁ , R ₂ , R ₃ , R ₄ to satisfy equation (1). Once determined, the voltages at each part of the detection circuit 1 will become as shown in the time chart of FIG. 2, and IC ₁ can detect a disconnection in the signal line 2. Also,
Since the output level of signal line 2 is binarized or level-shifted by IC ₂ , even if the input threshold of the device that uses the output of contact X is different, the output of contact Malfunctions caused by biasing with resistor _R1 can be prevented.

In other words, the voltage of signal line 2 is V ₁ during normal operation.
(contact X “open”) or V ₁ × (R ₂ + R ₃ )/R _{1 +} R ₂ + _{R 3} (contact When the IC ₁ is turned off, the input voltage V _IN1H =V ₂ and the output voltage of the IC ₁ is "H". On the other hand, when there is a disconnection between 1 and 1, the input voltage V _IN1L of IC ₁ becomes lower than the threshold voltage V _TH according to equation (4),
The output voltage of IC ₁ becomes "L" and becomes a disconnection detection output.

When IC ₂ is normal, the input voltage is “open” at contact
It changes as shown in equations (2) and (3) depending on the "closed" state, thus generating an "L" level signal of voltage 0 and an "H" level signal of voltage _V2 . In addition, when there is a disconnection between l, the voltage of signal line 2 is sufficiently lower than the "open" voltage of contact X when there is no disconnection between l, so the input of IC ₂ is
It is lower than V _IN2L , so the output voltage is at "L" level.

If you use a gate circuit, comparator, or other element that sucks current at the "L" level instead of contact X, connect a diode _D2 as shown in Figure 3 to block the "L" level current. The present invention can be applied by allowing current to flow only at the "H" level.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a disconnection detection circuit according to one embodiment of the present invention, Fig. 2 is a time chart showing the operation of each part of the circuit in Fig. 1, and Fig. 3 is a switch diagram showing another embodiment of the present invention. It is a circuit diagram of a part. 1...Disconnection detection circuit, 2...Signal line, X...Contact, _R1 , _R2 , _R3 ...Resistor, _IC1 ...General-purpose logic gate element, _V1 , _V2 ...DC power supply.

Claims (1)

[Claims for Utility Model Registration] 1. Disconnection of a signal circuit including a switch means that generates a high level signal when the impedance is low and a low level signal when the impedance is high, and a signal line that transmits the output signal of the switch means. In the detection circuit, an input terminal of a general-purpose logic gate element is connected to the output terminal of the signal line, and a first resistor is connected between the output terminal of the switching means and the high voltage side terminal of the DC power supply. , a second resistor is connected between the output end of the signal line and the low voltage side terminal of the DC power supply;
The voltage division ratio of the resistor is set such that the potential of the signal line when the output of the switch means is at a low level is higher than the input threshold voltage of the general-purpose logic gate element, and the potential of the signal line is set to A disconnection detection circuit that detects disconnection of the signal line based on the output level of the general-purpose logic gate element when the level becomes lower than a threshold voltage. 2. The disconnection detection circuit according to claim 1, wherein the switch means is an electrical contact whose one end is connected to the high voltage side terminal of the DC power supply.