JP2000184005A - Terminal adapter - Google Patents

Abstract

(57) [Summary] [Problem] To extend the lighting time of an LED regardless of the amount of communication data included in one frame of transmission / reception data and improve the visibility of the lighting display of a terminal adapter. A terminal adapter used for data communication includes a CPU, a flip-flop, and an LED. The flip-flop 3 turns on the LED 4 from when communication data included in one frame of transmission / reception data is first detected until the end of the frame, based on the frame synchronization signal and the transmission / reception data input via the CPU 2. A high-level drive signal is output to the LED 4, thereby extending the lighting time of the LED 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal adapter for improving the visibility of a lit display by extending the lit time of an LED lit when transmitting and receiving communication data.

[0002]

2. Description of the Related Art Conventionally, a terminal adapter used for data communication is configured, for example, as shown in FIGS. This terminal adapter 51 is shown in FIG.
As shown in (a), the CPU 52, a buffer 53 and an LED 54 are provided in series.

In this conventional example, transmitted and received data is
As shown in (b), when one frame includes a large number of communication data (for example, a LOW level portion in transmitted / received data), the communication data is transmitted to the CPU 52 and the buffer 5.
3, the LED 54 is turned on (lights up) during a period corresponding to the communication data, and is turned off (lights off) in other periods. Therefore, when the transmitted / received data includes a large number of communication data in one frame, the LED 54 lights up intermittently, so that the lighting time of the LED 54 becomes longer and the visibility is secured.

[0004]

However, if the transmitted / received data contains only a very small number (for example, one) of communication data in one frame as shown in FIG. LED54 only during the period
Are turned on (lit), and are otherwise kept off (extinguished), so that the LED 54 only lights up momentarily during one frame, and the lighting time is shortened. Therefore, the user's eyes appear to be lit darkly, and visibility cannot be ensured.

The present invention improves the visibility of the lighting display of the terminal adapter by extending the lighting time of the display element regardless of the amount of communication data contained in one frame of transmitted / received data. With the goal.

[0006]

According to a first aspect of the present invention, there is provided a terminal adapter used for data communication, wherein communication data included in transmitted / received data is detected for each frame. Detecting means;
Display means for turning on a display element from the time when the communication data is first detected by the communication data detection means to the end of the frame.

According to a second aspect of the present invention, in the first aspect, the specific data discrimination is performed to determine whether or not the communication data detected by the communication data detecting means is only predetermined specific data. Means are additionally provided so that the display element is turned off when the detected communication data is only the specific data specified in advance.

According to the first aspect, communication data included in data transmitted and received by the terminal adapter is detected for each frame by the communication data detecting means, and is displayed from when communication data is first detected until the end of the frame. The display element is turned on by the means. Since the communication data is generally included in a portion (for example, a HIGH level portion) located within a predetermined range from the beginning of the frame synchronization signal that defines one frame, the display element is switched after the detection of the communication data. It will continue to light. Therefore, even when transmitted / received data includes only a very small number of communication data in one frame, the lighting time of the display element is extended, and the visibility is improved.

According to the second invention, in the first invention, the display element is turned off when the communication data detected by the communication data detecting means is only the specific data specified in advance. The lighting time of the display element is not unconditionally extended, and the display element is not turned on when the transmitted / received data is only specific data (for example, a flag). Therefore, only when the transmitted / received data includes the communication data desired by the user, the lighting time of the display element is extended.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1A is a block diagram showing a circuit configuration of the terminal adapter according to the first embodiment of the present invention, and FIGS. 1B and 1C are time charts for explaining the operation. The terminal adapter according to the present embodiment includes a CPU 2, a flip-flop 3, and an LED 4, as shown in FIG.

The flip-flop 3 receives a frame synchronization signal from a frame synchronization signal generator (not shown) at an input terminal CK, and inputs and receives data transmitted and received via the CPU 2 (hereinafter referred to as transmission / reception data) to an inverted input terminal CL. At the same time, the power supply voltage is applied to the terminal D, and a drive signal is output from the inverted output terminal / Q to the LED 4, whereby the LED 4 is turned on or off.

Next, the operation of the present embodiment will be described. When the transmission / reception data includes a large number of communication data (for example, a LOW level portion in the transmission / reception data) in one frame as shown in FIG. 1B, the flip-flop 3 first detects the communication data (LOW level). Time (in the example shown,
After the start of one frame), a HIGH-level drive signal is output to the LED 4 from the inverted output terminal / Q.
D4 lights up. The lighting of the LED 4 is continued until the end of the frame (in the illustrated example, since the transmission / reception data is at the HIGH level at the end of the frame, the LED 4 is turned off at the start of the next frame).
The LED 4 is turned on in the entire area of the frame.

Similarly, when the transmission / reception data includes only one communication data in one frame as shown in FIG. 1C, the flip-flop 3 first detects the communication data (in the illustrated example, , At the start of one frame)
Drive the IGH level drive signal from the inverted output terminal / Q to the LED
4, the LED 4 is turned on. This LED4
Continues until the end of the frame (in the illustrated example, the transmission / reception data is HIGH at the end of the frame).
Level, so that the LED 4 is turned off at the start of the next frame).
Lights up.

According to the terminal adapter of the present embodiment, not only when the transmission / reception data includes a large number of communication data in one frame, but also when the transmission / reception data includes a very small number of communication data in one frame. Since the lighting time of the display element is extended to "from the time when communication data is first detected to the time when the frame ends", visibility is improved.

FIG. 2A is a block diagram showing a circuit configuration of a terminal adapter according to a second embodiment of the present invention, and FIG. 2B is a time chart for explaining its operation. The terminal adapter of the present embodiment is shown in FIG.
In this embodiment, a comparator 5 is added between the CPU 2 and the flip-flop 3 of the terminal adapter according to the first embodiment, and the other parts are configured similarly to the first embodiment.

The comparator 5 compares transmission / reception data input via the CPU 2 with specific data specified in advance (a signal which always flows when communication is established, for example, using a flag). , If they match, H
A signal that goes to the high level and goes to the low level when they do not match is output to the inverting input terminal CL of the flip-flop 3.

Next, the operation of the present embodiment will be described. When the transmitted / received data includes only the specific data in one frame as shown in FIG. 2B, the comparator 5 sets the HI in the frame.
In order to keep outputting the signal of the GH level, the flip-flop 3 which has inputted this signal to the inverting input terminal outputs the driving signal of the LOW level to the LED 4 from the inverting output terminal / Q, whereby the LED 4 is turned off. In addition, this LED
The turning off of LED 4 is continued until the communication data that is not the specific data is detected in the next frame, so that the LED 4 turns off in the whole area of the frame.

According to the terminal adapter of the present embodiment, when extending the lighting time of the LED 4, the LED 4 is turned off only when the communication data included in the transmission / reception data is only the specific data specified in advance. Thus, the lighting time of the LED 4 is not unconditionally extended, and the lighting time of the LED 4 is extended only when the transmission / reception data includes the communication data desired by the user.

In the second embodiment, when the transmitted / received data includes only the specific data in one frame, L
Although the ED 4 is turned off, the LED 4 may be turned on only when the transmission / reception data includes only specific data in one frame.
In this case, as shown in FIG. 3, the comparator 5 outputs a signal that goes low only when the transmission / reception data and the specific data (for example, a flag) match at the low level.
May be configured.

[0020]

As described above, according to the terminal adapter of the first aspect of the present invention, not only the case where the transmitted / received data includes a large number of communication data in one frame, but also the very small number of the transmitted / received data in one frame. Even when only communication data is included, the lighting time of the display element is extended, and the visibility is improved.

Further, according to the terminal adapter of the second invention, when the transmitted / received data includes only predetermined specific data included in one frame, the display element is turned off. Only when the transmitted / received data includes communication data desired by the user, the lighting time of the display element is extended.

[Brief description of the drawings]

FIG. 1A is a block diagram showing a circuit configuration of a terminal adapter according to a first embodiment of the present invention, and FIGS. 1B and 1C are time charts for explaining the operation thereof.

FIG. 2A is a block diagram showing a circuit configuration of a terminal adapter according to a second embodiment of the present invention, and FIG. 2B is a time chart for explaining its operation.

FIG. 3 is a time chart for explaining an operation of a modification of the second embodiment.

FIG. 4A is a block diagram showing a circuit configuration of a conventional terminal adapter, and FIGS. 4B and 4C are time charts for explaining the operation thereof.

[Explanation of symbols]

 Reference Signs List 1 terminal adapter 2 CPU 3 flip-flop 4 LED (display element) 5 comparator

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuo Kitamura 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Inventor Takashi Matsumoto 3- 192-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Nippon Telegraph and Telephone Corporation (72) Inventor Seiji Matsunami 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo F-Term within Nippon Telegraph and Telephone Corporation 5K030 GA18 HA08 JA03 KA21 MA04 MA08 MB09 5K034 AA18 EE11 FF09 HH04 KK04 TT02 5K101 LL03 MM06 NN17 PP06 9A001 BB06 CZ02 JZ12 LL00

Claims (2)

[Claims] 1. A terminal adapter used for data communication, comprising: communication data detection means for detecting communication data included in transmitted / received data for each frame; and communication data detection means for detecting communication data for the first time by the communication data detection means. A terminal adapter comprising: display means for turning on a display element until the end of a frame. 2. A specific data discriminating means for judging whether or not communication data detected by the communication data detecting means is only predetermined specified data is additionally provided, and the detected communication data is designated in advance. 2. The terminal adapter according to claim 1, wherein the display element is turned off when only the specified data is received.