JPH0454520Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial use) This invention describes the mounting state (type and number of electronic devices) of various electronic devices or electronic circuits housed in a nest, etc.
The present invention relates to a mounting state identification device for identifying.

(Prior art) Various electronic circuits (including electronic circuits formed on printed boards) that have been conventionally housed in nests, etc.
As a device for identifying the implementation status of the device, it connects signal lines to the data buses and address buses of various devices to be identified, and sends various data and addresses for identification to the devices to be identified, and also sends back information. There are some devices that are configured to receive data and learn the implementation status from this data.

(Problem that the invention attempts to solve) However, such conventional identification devices,
It is necessary to connect multiple signal lines to the data bus and address bus of the identified device, and the identified device is mounted in a backplane nest (a device with multiple signal lines prepared for each PCB slot). ), there was a problem that it could not be used.

The present invention was developed in view of these problems, and it is possible to improve the mounting state of electronic devices or electronic circuits that have a nested structure that is not based on the backplane method.
The present invention attempts to realize a mounting state identification device that can be identified using a pair of signal lines.

(Means for Solving the Problems) FIG. 1 is a block diagram of the configuration of the device of the present invention. In the figure, reference numerals 1a to 1n denote a plurality of identified devices, and 2 denotes an identification device main body connected to the plurality of identified devices 1a to 1n via a pair of identification signal lines 3.

In the plurality of identified devices 1a to 1n, 11 inputs the voltage of a pair of identification signal lines 3, and the voltage value is a predetermined set voltage value for the own device.
Voltage monitoring means 12 monitors whether the voltage exceeds ES1 to ESn, and reference numeral 12 indicates a pair of identification signal wires 3, in which a current of a constant current value predetermined by a signal from the voltage monitoring means is detected.
This is a constant current output means that supplies a constant current to the current.

In the identification device main body 2, reference numeral 21 denotes a voltage application means for sequentially applying predetermined set voltages ES1 to ESn to the identified device via a pair of identification signal lines 3, and 22 a set voltage application by the voltage application means 21. Current detection means 23 detects the current flowing through the pair of identification signal lines 3 at the time; This is an identification means for identifying the mounting status of a plurality of identified devices from the values.

(Operation) The discrimination means 23 detects one through the voltage application means 21.
Set voltage values assigned to identified devices that may be connected to the pair of identification signal lines are applied in sequence, and the type and number of connected identified devices are identified from the output of the current detection means 22 for the applied voltage values.

(Embodiment) FIG. 2 is a configuration and connection diagram of an embodiment of the present invention. In the figure, parts corresponding to those in FIG. 1 are designated by the same reference numerals. Each identified device 1a~
1n, the voltage monitoring means 11 monitors the voltage of the identification signal line 3 and the set voltage ES assigned to it.
1, and the current output means 12 includes a Zener diode ZD,
A comparator is connected in series to a pair of identification signal lines 3.
It is configured to include a transistor Q through which a constant current corresponding to the Zener diode ZD flows based on the output of COP1.

In the identification device main body 2, a microprocessor μP is used as the identification means 23. The voltage application means 21 includes a D/A converter that converts the voltage setting value given from the microprocessor μP into an analog signal, and a voltage outputted from the analog setting value from the D/A converter to the identification signal line 3. A comparator COP2 compares _the voltage _Ed corresponding to Transistor _Q1 that outputs
Consists of _Q3 . The current detection means 22 also includes a current detection resistor R ₃ that is connected in series to the identification signal line 3 and generates a voltage e _i corresponding to the current flowing therethrough, and an amplifier OP that amplifies this voltage e _i . and an A/D converter that converts the output of the amplifier OP into a digital signal and supplies it to the microprocessor μP.

The operation of the device configured in this manner will be described next. In the following explanation, the identification signal line 3 is connected to electronic circuits No. 1 to No. 6 (named AA to No. 6) as shown in FIG.
DD) is implemented, and the unique voltage values assigned to each electronic circuit are determined as shown in the figure.

FIG. 4 is a flowchart showing an example of the operation. Microprocessor 23 as identification means
First, clear the identification result table prepared internally, and set the initial value of the identification voltage to 9.5V (this voltage value is a value lower than the unique voltage value set for each electronic circuit No. 1 to No. 6). ) is output via the D/A converter (steps 1 and 2). In this state, the current flowing through the identification signal line 3 is detected by the current detection means 2.
2. Read through the A/D converter and initialize an internally prepared loop counter with the value (step 3).

Next, the identification voltage is updated, and the identification voltage of, for example, 10.5V is output from the voltage applying means 21 via the D/A converter (step 4). In this state, the current flowing through the identification signal line 3 is detected, and the difference between the A/D converted value and the identification current before updating is determined.
This is the constant current value for identification per device.
Divide by ICONST to find the number of devices installed. This number of mounted devices is stored in the identification result table as the identification result (step 5).

Subsequently, the identification current value is updated and the loop counter is increased (steps 6 and 7). Next, check whether only the types of electronic circuits No. 1 to No. 6 (here, 4 types) have been determined (the value m of the loop counter is 4).
(step 8), and repeat steps 4 to 8 until m=4. m=
When it reaches 4, 0V is applied to the identification signal line 3 and the process ends.

FIG. 5 shows the voltage V _OUT applied to the identification signal line 3.
6 is a diagram showing the relationship between the current and the identification current flowing at that time, and FIG. 6 is a diagram showing the identification result in the case of FIG. 5.

(Effect of the invention) As explained above, according to the device of the invention,
The type and number of mounted electronic circuits or electronic devices can be identified using a pair of identification signal lines, and it can be easily applied to devices that do not have a backplane structure.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the configuration of the device of the present invention, FIG. 2 is a configuration and connection diagram of an embodiment of the present invention, FIG. 3 is an explanatory diagram of the electronic circuit connected to the identification signal line, and FIG.
5 is a flowchart showing an example of the operation, FIG. 5 is a diagram showing the relationship between the voltage applied to the identification signal line and the identification current, and FIG. 6 is a diagram showing the identification result in the case of FIG. 1a to 1n... Device to be identified, 2... Identification device main body, 3... Identification signal line, 11... Voltage monitoring means, 12... Constant current output means, 21... Voltage application means, 22... Current Detection means, 23...Identification means.

Claims (1)

[Claims for Utility Model Registration] Consisting of a plurality of identified devices and an identification device main body connected to the plurality of identified devices via a pair of identification signal lines, the plurality of identified devices are: , a monitoring means for inputting the voltage of the pair of identification signal lines and monitoring whether the voltage value exceeds a predetermined voltage value for the device; and an output from the monitoring means. constant current output means for causing a current of a predetermined constant current value to flow through the pair of identification signal lines; a voltage applying means for sequentially applying set voltages determined respectively to the voltage applying means; a current detecting means for detecting a current flowing through a pair of identification signal lines when the set voltage is applied by the voltage applying means; Mounting state identification characterized by having an identification means for identifying the mounting state of the plurality of devices to be identified based on the voltage value applied to the pair of identification signal lines and the current value detected by the current detection means. Device.