JPS6025482A - Electronic stopwatch - Google Patents

Abstract

PURPOSE:To prevent important data from disappearing by discriminating whether a printer is connected or not from the state of a control signal input terminal after print data is outputted, and deciding on subsequent control. CONSTITUTION:When a push-button input of a stopwatch appears at an input circuit 21, a control circuit 22 starts and stops the operation of a counting circuit 24 and also transfers the data of the counting circuit 24, so that the data is outputted to a display device 26 through a display circuit 25. Further, the data is outputted to a print data output line 28. The control input line does not change at all unless a printer 27 is connected, but a control signal line becomes active simultaneously with the start of printing when the printer 27 is connected. Consequently, it is discriminated that the printer 27 is connected and a decision on subsequent control is made.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic stopwatch that can be used without a printer and that can be connected to a printer when the printed measurement results are indispensable.

The stopwatch with a printer shows the results measured with a stopwatch, namely the stop time from the start manual input to the /-5 stop input, the step time from the nutart input to the lap manual input, and the stop time from the 74-F input to the lap input. The stop time, the lap time between lap inputs, etc. are printed on the printer. If it is not determined whether the printer is connected or not, the following problems occur.

If the stopwatch has a memory and the printer is connected, the memory is used for temporary storage until the print is finished, and if the printer is not used, KVi is used, and if the former is used to store the measurement results, the former requires only the data before printing. However, the latter requires higher-level data. Therefore, if you do not know whether the printer is connected or not, you will lose important data.

It is an object of the present invention to provide a circuit configuration that overcomes these drawbacks.

The present invention determines whether the printer is attached or not based on the state of the control signal input terminal for outputting print data.2.
Based on this, future control will be determined.

This is explained in detail using drawings below. Figure 941 shows the external appearance of an embodiment of the present invention, with 11 being the main body of the main body, 12 being a liquid crystal panel that is a display device, and 13 being an external controller for inputting start, stop, lap, reset, etc. The push button suirichi which is the working part, 14 is pudding 1
-115 is a connection cable. The stopwatch main body 11 and the printer 14 can be connected and disconnected by a connecting cable 15. The general specifications of this embodiment are as follows. Start, stop, wrap, and reset operations are performed using the two push-button switches, and the results are displayed on the liquid crystal panel KW. When a printer is not connected, the car can store measurement results in memory so that they can be checked after measurement. 11. Since the memory has a visual field, it is first inputted and the measurement results are recorded and stored in the memory. When a printer is connected, the measurement results are printed by the printer, so there is no need to store them in memory, but since there is a limit to printing speed, it is necessary to store all measurement results before printing. Hikorarai. Therefore, we decided to use the memory that stored the upper measurement results when the printer was not connected and use it to store the measurement results before printing. In this way, the method of using memory differs depending on whether or not a printer is connected, so it is necessary to know in advance whether or not a printer is connected. The method @
This will be explained using the following two figures. FIG. 2 is a block diagram of an embodiment of the present invention, in which 20 is an oscillation frequency divider circuit that generates a reference signal, divides the frequency, and supplies necessary signals to each part;
Push-button switch Ichi and its processing input circuit, 2
2 is a control circuit that controls the overall operation, 23 is a memory that stores the measurement results mentioned above, 24 is a counting circuit that counts the time of the stopwatch, and 251 converts the data to be displayed into a signal suitable for the display device. display circuits, 26-screen LCD panels, and 27-screen printers. The main body of the strike watch is made up of 20-26.

28 is a 29-digit control signal input line for sending measured data to the printer after outputting print data, and is a BURY signal indicating that data cannot be input while the printer is printing.

Operation■9. Specifically, when there is an input from the push button of the stopwatch in the input circuit 21, the control circuit 22Vc starts and stops the counting circuit, displays the data of the counting circuit, and displays the data on the display fF4: 26K using the circuit 25. At the same time, data is output to the print data output line 28. If the printer is not connected, the control signal will not change manually, but if the printer is connected, the control signal will become active as soon as printing starts, prohibiting the output of the next print data, and stopping the printer. It is possible to know that the memory is connected, and to decide how to use the memory mentioned above. FIG. 3 is a timing chart of the print data output line 28 and the BUSY signal 29 in FIG. 2. In the section 30, the printer is in a state in which data can be input, and in which no data is input.

Data is being output from the 3m+-t stopwatch and input to the printer. The 32-digit printer starts printing and outputs the BUFY signal to prohibit the stopwatch from outputting data.

At this time, the stopwatch side knows that Prin i- is connected, and can decide on subsequent processing such as changing memory usage. BtJllIY signal 29 Since the printer side cannot perform print processing and data input processing at the same time, the stopwatch is used to prohibit data output, and the determination of the presence or absence of the printer is also determined by the hardware of the car, which uses the same signal line. Eliminating costs.

As described above, according to the present invention, it is possible to determine the presence or absence of a printer by knowing the presence or absence of a printer with a simple configuration, and to determine subsequent control based on this information, it is possible to provide a printer that is much more convenient and inexpensive. can.

[Brief explanation of drawings]

FIG. 1 shows the appearance of one embodiment of the present invention. FIG. 2 is a block diagram of one embodiment of the present invention. Figure 3 shows the timing diagram of the signals used in Figure 2.
to . 1 bed Upper Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In an electronic stopwatch that has at least a reference signal source, an electronic circuit, an external operating member, a power source, a display device, and a printer connection terminal including a data output terminal and a control signal input terminal, print data is output from the data output terminal. The electronic stopwatch is characterized in that it determines whether a printer is attached or not based on the subsequent state of the control signal input terminal, and then determines subsequent control.