JPH02150142A - Balanced type device erroneous connection discrimination circuit - Google Patents

Abstract

PURPOSE:To discriminate the erroneous connection of an unbalanced type small computer system by providing a discriminator in which another driver circuit is connected in parallel to a driver circuit and a low voltage DC power source is connected to the output of the driver circuit via the discriminator. CONSTITUTION:The driver circuit 7 is connected to a terminal 1 in parallel with the driver circuit 2, and the connection terminal 9 of the low voltage DC power source is connected to the driver circuit 7 via a light emitting diode 8. In the case of connecting the interface of the unbalanced type small computer system, since the terminal 1 is connected to the ground(G), and 'L' (low) is inputted to the driver circuits 2 and 7, no driver circuit operation permission signal is outputted from the driver circuit 2 to a terminal 3. However, a current flows on the light emitting diode 8 from the low voltage DC power source via the terminal 9, then, the light emitting diode 8 is lit. In such a way, it is possible to discriminate the erroneous connection.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a balanced device misconnection determination circuit that warns of misconnection between an interface of a balanced compact computer system and an interface of an unbalanced compact computer system.

[Prior Art] In the balanced and unbalanced small computer system interfaces (SC8I), signals are assigned to connectors 01 to 50, respectively, as shown in Tables 1 and 2, respectively. In the interface of this balanced compact computer system, a signal (DIFFSENS) is generated in advance at the 21st pin of the connector as shown in Table 1, so if this signal (DIFFSENS) is used as the driver operation enable signal, the 4th As shown in the figure, a signal (DIFFSENS) is input to the terminal 1, whereby an operation permission signal is generated from the driver circuit 2 and output from the output terminal 3.

Note that the input terminal 1 is connected to a resistor 4 and the cathode of a diode 5, and the anode of the diode 5 is connected to a terminal 6 to which a low voltage DC power supply (+5 V) is connected.

[Problems to be Solved by the Invention] By the way, as shown in Table 2, the unbalanced type small computer system interface has connectors 01 to 50 like the balanced type small computer system interface, and , the 21st pin of the connector is connected to ground (G).

Therefore, the interfaces of balanced and unbalanced small computer systems have the same connectors 01 to 50.
Because of the pins, it is often the case that an unbalanced small computer system interface is connected instead of a balanced small computer system interface, and each time the small computer system interface becomes inoperable. In order to find out the cause, it is necessary to check whether the interface devices of all the connected small computer systems are balanced or unbalanced, and it takes time to determine whether it is an incorrect connection. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a balanced device misconnection determination circuit that uses a discriminator to determine a misconnection when an interface of an unbalanced small computer system is connected instead of an interface of a balanced small computer system. It is something.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a driver circuit connected to an input terminal, a resistor connected to the driver circuit,
In a balanced driver protection circuit in which a low voltage DC power supply is connected through a diode whose cathode is connected to the resistor, another driver circuit is connected in parallel to the driver circuit, and a light emitting diode is connected to the output of the driver circuit. A discrimination device is provided which is connected to a low-voltage DC power supply via the

Further, in a balanced driver protection circuit in which a driver circuit is connected to an input terminal, a resistor is connected to the driver circuit, and a low voltage DC power source is connected to the resistor through a diode whose cathode is connected, the driver circuit is connected to a data bus, and includes a determining means for determining whether or not the driver circuit outputs an operation permission signal on the data bus immediately after power is turned on, and a display section for displaying a determination result by the determining means. It is something that

[Function] According to the present invention, a discrimination device such as a light emitting diode or a buzzer is provided in parallel with the balanced driver protection circuit, and the discrimination device operates the light emitting diode or the buzzer when the operation permission signal (DIFFSENS) is not input. The device emits light or sounds an alarm to determine that the unbalanced small computer system interface is incorrectly connected instead of the balanced small computer system interface, and also outputs data from the balanced driver protection circuit. connected to the data bus, and when the power is turned on, the determining means determines whether a driver circuit operation enable signal is output from the balanced driver protection circuit onto the data bus;
The determination result is displayed on the display section.

[Embodiment] Referring to FIG. 1, in the balanced device misconnection determination circuit of the embodiment of the present invention, 1 is a terminal, 2 is a driver circuit, 3 is an output terminal, 4 is a resistor, 5 is a diode, and 6 is a This is a connection terminal for low current direct current @ (+5V), and since these configurations are the same as the conventional example above, the explanation will be omitted. In this example, the driver circuit is connected to terminal 1 in parallel to driver circuit 2. 7 is connected to the driver circuit 7, and a terminal 9 for connecting a low voltage DC power supply (+5 V) to the driver circuit 7 is connected via a light emitting diode 8.

In the balanced device misconnection detection circuit of this embodiment configured as described above, if the connection of the interface of the balanced small computer system is correct and the driver operation permission signal (DIFFSENS) is input from terminal 1, the driver operation is disabled. The permission signal (DIFFSENS) is “H” (high)
'', the driver operation permission signal is output from the driver circuit 2 to the output terminal 3. Note that 1 light emitting diode 8
Since no current flows through the terminal 9 from the low voltage DC power supply, the light emitting diode 8 does not light up.

If an unbalanced small computer system interface is connected, terminal 1 is connected to ground (G).
, and L (low)'' is input to the driver circuit 2.7, so the driver circuit operation enable signal is not output from the driver circuit 2 to the terminal 3. However, the light emitting diode 8
A current flows from the low-voltage DC power source through the terminal 9, and the light emitting diode 8 lights up, indicating that there is an incorrect connection.

Note that, instead of the light emitting diode 8, a buzzer may be used as the discrimination device to generate an alarm sound.

Referring to FIG. 2, in the balanced device misconnection determination circuit of the present invention, 1 is a terminal, 2 is a driver circuit, 3 is an output terminal, 4 is a resistor, 5 is a diode, and 6 is a low voltage DC f
This is a connection terminal for the fi source (+5 V), and since these configurations are the same as those in the conventional example above, the explanation will be omitted. is a storage device 12 such as a ROM or hard disk that stores control programs, etc., and a CR that displays the result of misconnection determination.
A display device 13 such as a T-display is connected.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG. First, the operation permission signal (DIFFSEMS) is treated as data and determined by the software of the interface of the small computer system. First, immediately after power is turned on, a signal (DIFF
The CPU II determines whether the signal (DIFFSENS) is output, and if the signal (DIFFSENS) is detected, the SEM of the interface of the balanced small computer system
If S) is not detected, the 1 determination result is displayed on the display device 13, and the CPU II stores the storage device l! By stopping the interface control program stored in 12, the operation of the interface of the small computer system is stopped.

In this way, in the embodiment of the present invention, it is possible to easily know whether the interface of the unbalanced small computer system is incorrectly connected to the interface of the balanced small computer system.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to easily determine whether or not the interface of an unbalanced small computer system is incorrectly connected by light emission and alarm sound. It is possible to eliminate the time during which the system malfunctions, and since such erroneous connections can be determined on software, there is an advantage that erroneous connections can be reliably determined in a short time.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a balanced device misconnection determining circuit according to one embodiment of the present invention, FIG. 2 is a circuit diagram of a balanced device misconnection determining circuit according to another embodiment of the present invention, and FIG. A flowchart explaining the operation of the circuit shown in FIG. 2, and FIG. 4 a circuit diagram of a conventional balanced device misconnection determination circuit. DESCRIPTION OF SYMBOLS 1...Terminal, 2...Driver circuit, 3...Output terminal, 4...Resistor, 5...Diode, 6...Connection terminal, 7...Driver circuit, 8... Light emitting diode, 9...terminal, 10...data bus, 11...C
PU, 12... Storage device, 13... Display device.

Claims (1)

[Claims] 1. Balanced driver protection in which a driver circuit is connected to the input terminal, a resistor is connected to the driver circuit, and a low voltage DC power supply is connected to the resistor via a diode whose cathode is connected. A balanced device characterized in that the circuit is provided with a discrimination device in which another driver circuit is connected in parallel to the driver circuit, and a low voltage DC power supply is connected to the output of the driver circuit via a discrimination device. Misconnection detection circuit. 2. In a balanced type driver protection circuit in which a driver circuit is connected to an input terminal, a resistor is connected to the driver circuit, and a low voltage DC power source is connected via a diode whose cathode is connected to the resistor, the driver A determining means for connecting an output of the circuit to a data bus and determining whether or not the driver circuit outputs an operation permission signal on the data bus immediately after power is turned on; and a display section for displaying a determination result by the determining means. A balanced device misconnection determination circuit characterized by providing a balanced device misconnection determination circuit.