JPH04231884A - State monitor apparatus in electronic machinery - Google Patents

Abstract

PURPOSE:To provide electronic machinery capable of making shift with one input wire to a CPU when the states of a plurality of switches detecting the kind of a connected option board or the states of respective parts are monitored by the CPU. CONSTITUTION:By converting the analogue data (voltages) outputted from the option boards 4-7 selectively mounted on the CPU 2 of electronic machinery to digital signals, many option boards 4-7 are discriminated by the CPU 2 using one input wire. In the same way, even when the switches detecting the states of the respective parts of the electronic machinery are monitored, various switches connected to the CPU 2 are connected to a power supply through resistors having different resistance values and the analogue data (voltages) inputted from those switches are converted to digital signals to discriminate the states of many switches by the CPU 2 using one input wire.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a status monitoring device for electronic equipment.

0002

2. Description of the Related Art For example, some electronic devices such as printers are designed to selectively connect a plurality of option boards for the purpose of functional expansion. In this case, it is necessary to determine the type of option board selected. A conventional structure for this determination is shown in FIG. 4 below. 1 is the main body of the electronic device, and inside is an option board 15
, 16, 17 is provided. These option boards 15, 16, 1
7 outputs digital signals (H, H) (H, L) (L, H), respectively, so the CPU 14 controls the option boards 15, 16, 17 connected by the digital signals input to the P1 and P2 ports. Discern.

Furthermore, electronic equipment has switches for detecting the status of each part, and it is necessary to control various operations by monitoring these switches. For example, as shown in Figure 5, in a printer, the cover open switch, the switch that detects the position of the gap set lever that adjusts the print gap, and the position of the release lever that selects between friction feed and tractor feed for each print paper are detected. Various switches 10, such as switches for
11, 12 are provided in the main body 1 of the printer, and these switches 10, 11, 12 are connected to the power supply 3, and the CPU
Connect to 14 P1, P2, and P3 ports, and connect these P1
, P2, and P3 ports to monitor the status of each part.

0004

[Problem to be solved by the invention] What is shown in FIG.
Since the PU 14 recognizes the option boards 15, 16, and 17 based on the combination of the input signals H and L, it can only identify the three types of option boards 15, 16, and 17 even if it has two input ports P1 and P2. If this is not possible and more optional boards are required, a CPU with multiple ports must be used.

In the system shown in FIG. 5, only one switch can be connected to one port, and a CPU having many ports must be used to monitor the status of many switches.

[0006]

[Means for Solving the Problem] The invention of claim 1 provides a plurality of option boards having different output voltages, and a CPU having an analog terminal to which these option boards are selectively connected is provided in the main body of an electronic device. Ta.

The invention of claim 2 provides a plurality of option boards having different output voltages, an A/D conversion means to which these option boards are selectively connected, and a CPU constantly connected to the A/D conversion means. and are provided on the main body of the electronic device.

According to a third aspect of the invention, the input terminals of a plurality of switches indicating the operating state of each part are connected to a power source through resistors having different resistance values, and the analog terminal is connected to an output terminal of the switch. A CPU is installed in the main body of an electronic device.

[0009]

[Operation] According to the invention of claim 1, since the analog data output from each option board with different voltages is converted into various digital signals and discriminated by the CPU itself, only one input line is required for the CPU. , it is possible to increase the number of option boards to be determined.

[0010] In the invention of claim 2, the analog data output from each option board with different voltages is converted into various digital signals by the A/D conversion means and discriminated by the CPU. Only one means and one input line for the CPU is required, and it is possible to increase the number of option boards to be determined.

[0011] According to the third aspect of the invention, when each switch is turned on, the potentials of the resistors connected to these switches are different, so that the analog data input from each switch to the analog terminal of the CPU is controlled by the CPU itself. Since it is converted into various digital signals and discriminated, the CPU
Only one input line is required for the switch, and the number of switch determinations can be increased.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention according to claim 1 will be explained based on FIG. Reference numeral 1 indicates the main body of an electronic device such as a printer. The input side of the CPU 2 and the power supply 3 provided in this main body 1
A resistor R0 is connected between the two. Option boards 4, 5,
Resistors R1, R2, R3, and R4 provided at 6 and 7 are connected. These resistors R1, R2, R3, and R4 have one end grounded and have different resistance values.

In such a configuration, when any of the option boards 4, 5, 6, 7 is connected to the CPU 2,
The option boards 4, 5,
The voltage input to the CPU 2 from 6 and 7 changes. This analog data with different voltages is converted into various digital signals and discriminated by the CPU 2 itself.
Only one input line for U2 is required, and it is possible to increase the number of option boards to be determined.

Next, an embodiment of the invention of claim 2 is shown in FIG.
The explanation will be based on. Components that are the same as those in the embodiment described above are designated by the same reference numerals, and description thereof will be omitted (the same applies hereinafter). Main body of electronic device 1
is provided with an A/D conversion means 8 and a CPU 9 connected to each other, a resistor R0 is connected between the input side of the A/D conversion means 8 and the power supply 3, and the resistor R0 and the input side of the CPU 2 are connected to each other. The resistors R1 of option boards 4, 5, 6, and 7 are connected between
R2, R3, and R4 are connected.

In such a configuration, when any of the option boards 4, 5, 6, 7 is connected to the A/D conversion means 8, the resistances R1, R2, R3, R4 and the inside of the main body 1 are connected. Option board 4 depending on the voltage division ratio with resistor R0
, 5, 6, and 7 to the A/D conversion means 8 changes. This analog data with different voltages is transferred to the A/D
Since the conversion means 8 converts into various digital signals, and the digital signals are discriminated by the CPU 9,
Only one input line is required for the /D conversion means 8 and the CPU 9, and it is possible to increase the number of option boards to be determined.

In the above embodiment, the option board 4
, 5, 6, and 7 are provided with resistors R1, R2, R3, and R4, and a power source 3 connected to these resistors R1, R2, R3, and R4.
was installed on the main body 1 of the electronic device, but the option board 4,
Power sources 5, 6, and 7 may be provided with different voltages.

Furthermore, an embodiment of the invention according to claim 3 is shown in FIG.
The explanation will be based on. The main body 1 of the printer includes various devices such as a cover open switch, a switch that detects the position of the gap set lever that adjusts the print gap, and a switch that detects the position of the release lever that selects between friction feed and tractor feed for each printing paper. Switches 10, 11, 12, 13 are provided, and the input terminals of these switches 10, 11, 12, 13 are connected to the power supply 3 via resistors R1, R2, R3...Rn having different resistance values, respectively. Switch 10, 11, 12, 1
The output terminal 3 is connected to an analog terminal of the CPU 2 provided in the main body 1 and a resistor R0.

In such a configuration, each resistor R1, R
2, R3...Rn have different resistance values, the switches 10,
When switches 11, 12, and 13 are turned on, the resistance R0 changes depending on the number and type of switches 10, 11, 12, and 13 that are turned on.
The voltage input to the CPU 2 changes depending on the voltage division ratio. This analog data with different voltages is converted into various types of digital signals and discriminated by the CPU 2 itself, so only one input line is required for the CPU 2, and the switches 10 and 1
The number of discriminations of 1, 12, and 13 can be increased.

[0019]

[Effects of the Invention] According to the invention as claimed in claim 1, a plurality of option boards with different output voltages are provided, and a CPU having an analog terminal to which these option boards are selectively connected is provided in the main body of the electronic device. Analog data output from each option board with different voltages is converted into various digital signals and discriminated by the CPU itself, so only one input line is required for the CPU, and the number of option boards that can be discriminated can be increased. It has the following effects.

The invention of claim 2 provides a plurality of option boards having different output voltages, an A/D conversion means to which these option boards are selectively connected, and a CPU constantly connected to the A/D conversion means. Since the analog data output from each option board with different voltages is converted into various digital signals by the A/D conversion means and discriminated by the CPU, the A/D Only one input line is required for the conversion means and the CPU, and the number of option boards to be determined can be increased.

According to the third aspect of the present invention, input terminals of a plurality of switches indicating the operating state of each part are connected to a power source through resistors having different resistance values, and the analog terminal is connected to an output terminal of the switch. Since the CPU is installed in the main body of the electronic device, when each switch is turned on, the potentials of the resistors connected to these switches are different.
The analog data that is input from each switch to the analog terminal of the CPU is converted into various digital signals and discriminated by the CPU itself, so only one input line is required for the CPU, and the number of switches that can be discriminated can be increased. It has the following effects.

[Brief explanation of the drawing]

FIG. 1 is an electronic circuit diagram showing an embodiment of the invention according to claim 1.

FIG. 2 is an electronic circuit diagram showing an embodiment of the invention according to claim 2.

FIG. 3 is an electronic circuit diagram showing an embodiment of the invention according to claim 3.

FIG. 4 is an electronic circuit diagram showing a conventional example.

FIG. 5 is an electronic circuit diagram showing a conventional example.

[Explanation of symbols]

1 Main body of electronic device 2
CPU 3 Power supply 4 to 7 Option board 8
A/D converter 9
CPU 10-13 switch

Claims (3)

[Claims] 1. Status monitoring in an electronic device, characterized in that a plurality of option boards with different output voltages are provided, and a CPU having an analog terminal to which these option boards are selectively connected is provided in the main body of the electronic device. Device. 2. A plurality of option boards with different output voltages are provided, and A/D conversion means to which these option boards are selectively connected and a CPU constantly connected to the A/D conversion means are connected to the electronic device. A condition monitoring device for an electronic device, characterized in that it is provided in the main body. 3. Input terminals of a plurality of switches indicating the operating status of each part are connected to a power supply through resistors having different resistance values, and a CPU having an analog terminal connected to the output terminal of the switch is connected to an electronic device. A condition monitoring device for an electronic device, characterized in that it is provided in the main body.