JPS62221239A - Serial transmission monitor device - Google Patents

Abstract

PURPOSE:To obtain a monitor device of high real-time display performance by inputting data on a transmission line to a character generator corresponding to the code system of data by switching to generate a display pattern. CONSTITUTION:Transmission data DI on a serial transmission line L is stored in a RAM 3 through a receiver 1 by a microprocessor muP2. Data to be displayed out of data in the RAM 3 are written in a video RAM 4. A code system setting circuit 8 selects a character generator CG Ai corresponding to the code system of data on the transmission line L through a character generator switching circuit 11, and data from the RAM 4 is converted to a display pattern by the selected CG Ai. The display pattern is displayed on a display device 7.

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

The present invention relates to a serial transmission path monitoring device that receives and displays transmission data flowing through a serial transmission path on a display device, and performs monitoring operations such as discovering, warning, and analyzing transmission failures. Note that in the description of each figure below, the same reference numerals indicate the same or corresponding parts.

[Prior art and its problems]

Conventionally, this type of device has been known by names such as online and online scope. FIG. 2 is a block diagram showing the main structure of this type of monitor device. In the figure, L is a serial transmission path through which upstream and downstream serial transmission data flows. DI is transmission data taken into this monitor device from the transmission path for monitoring purposes. The receiving circuit 1 extracts and temporarily stores individual net data (data code) consisting of a predetermined bit configuration such as 7 bits, 8 bits, etc. from the start bit and stop bit of each individual transmission data. A microprocessor (also abbreviated as μP) 2 is a receiver circuit 1
The data codes temporarily stored in the data code are retrieved one after another and subjected to predetermined simple processing as necessary (for example, for a 7-bit data code, 1-bit data is added to the beginning to make it 8 bits (1 byte)). The data are transferred to the RAM 3 one after another while performing the following operations. 4 is a RAM having a storage area corresponding to each data area on one display screen of the display device 7 consisting of a CRT, LCD, etc.;
The data to be displayed on the display 7 is stored for each data code. μP2 is in the data stored in RAM3,
Data codes to be displayed on the display 7 are sequentially extracted and stored in the video RAM 4. CG is a character generator consisting of ROM etc.
Characters corresponding to each data code in the video RAMA (characters here refer to characters in a broad sense including numbers, symbols, etc.)
Another display pattern is stored in advance. Reference numeral 6 denotes a display control circuit which periodically sends each data code in the video RAMd to the character generator CG in the order of display (in the order of screen scanning of the display 7), and generates data (pattern) representing the display pattern of the data code. Data) PD is received from the character generator CG, and its display pattern is displayed at the corresponding display position on the screen of the display 7. 8 is a code system setting circuit that determines the transmission data DI, and therefore the code system to which each data code for display in the video RAMA complies (here, the code is ASCI I. Also called a standard code for information processing such as JIS 8.EBCDIC, This is a rule that predetermines the correspondence between the bit configuration of individual binary data (data code) corresponding to each character and the character it represents. By the way, since this character generator CG only stores display patterns corresponding to each data code according to one code system, it tries to monitor the transmission data DI of a code system different from the code system, and the code system setting circuit When setting this different chord system in 8, 1,
μP2 must convert the data code for display taken out from RAM3 into a data code that can generate the same display pattern as the display pattern to be displayed using the data code, and store it in video RAM4. However, in this code conversion method, the RAM
When storing the display data from 3 to the video RAM 4, it is done by software via μP2, which has the disadvantage that it takes time to decide whether to convert it to the code to be displayed and to convert the code. . Particularly when most of the code systems have different code assignments or when there are many code systems that need to be supported, the amount of memory and time required for the above-mentioned code conversion judgment and conversion work becomes large, and the load on μP2 increases. becomes very large. However, even if the load on the μP becomes large, priority must be given to data reception from the serial transmission line, which results in a delay in display. This leads to deterioration of real-time display performance, which is one of the performance characteristics of the monitor device. In addition, there are new chord display patterns that should be supported.
There is also the drawback that if the display pattern is completely different from the one stored in the character generator CG, it cannot be realized because there is only one character generator CG.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks, displays transmitted data according to multiple code systems without converting data codes by software, and is capable of displaying transmitted data according to a plurality of code systems. The purpose of the present invention is to provide a transmission monitoring device.

[Key points of the invention]

The gist of the present invention is to include a video RAM that has a storage area corresponding to one screen of a display means (display device, etc.) and stores data to be displayed on the display means for each data code;
While sequentially inputting the transmission data on the serial transmission path, after performing simple processing on this transmission data as necessary,
In a serial transmission monitor device that performs operations such as storing data to be displayed in the video RAM and displaying it on a display means, each data code of the display data stored in the video RAM is configured to conform to a compliant code system. A character generator that stores a display pattern for each data code for each of a plurality of code systems, and means (code system setting circuit, CG switching circuit, etc.); and means (display control circuit, etc.) for displaying a display pattern corresponding to each data code in the video RAM on the display means via the enabled character generator. The point is that it is equipped with the following.

[Embodiments of the invention]

The present invention will be described in detail below based on FIGS. 1(A) and 1(B). Figures (A) and (B) are block diagrams showing the configuration of main parts as different embodiments of the present invention, and Figure (^)
corresponds to Fig. 2, and Fig. CB) corresponds to a part of Fig. (^). In Fig. 1 (8), the difference from Fig. 2 is that instead of the previous character generator CG, a character generator CGA (C
GAI to CGA3) are provided, and according to the code system settings of the code system setting circuit 8, one of the three character generators CGA is selected via the CG switching circuit 11 (IIA).
The point is that only the code system corresponding to the transmission data DI to be monitored is given an enabling signal (CE flaw signal) to be enabled. In this example, the character generators CGAl to CG
A3 corresponds to each code system of ASCIl and JIS8°EBCDIG. Next, the operation of FIG. 1(A) will be described.
2 stores the data once in RAM3. μP2
is RA when not receiving serial transmission data DI.
Data to be displayed among the data stored in M3 is written to an appropriate address position in the video RAMA for display on the display 7. Each display data code outputted from the video RAM 4 by scanning by the display control circuit 6 becomes a common address to the character generators CGAI to CGA3, and the display pattern corresponding to the data code is set by the code system setting circuit 8. Any one character generator CGA enabled as
The signal is output to the display control circuit 6 and displayed on the display 7. Here, code system setting circuit 8. In order to enable any one of the character generators CC;A1 to CGA3 via the CG switching circuit 11, the setting circuit 8 and the switching circuit 11A may be separated from the internal bus IB of μP2 and made into independent hardware. . Next, in FIG. 1(B), instead of using the three character generators CGA1 to CGA3 as described above, one character generator with a large capacity is used.
Display patterns of a plurality of code systems are stored in the character generator CGB as one ROM, and the output of the CG switching circuit 11 (IIB) is set as the upper address ADH to the character generator CGB.
The output data code from the character generator CG
As the lower address ADL to B, the display pattern corresponding to this input data code may be switched.

【Effect of the invention】

As is clear from the above description, according to the present invention, the code system to which the transmission data to be monitored is based is changed by switching the character generator for each code system. This eliminates the need for code conversion, making it possible to provide a monitor device with high real-time display performance, and also making it possible to monitor transmitted data according to a specific code system by simply changing the character generator. Here, a supplementary explanation will be given regarding the usefulness of the present invention. Even though it is called serial transmission, there are various differences in speed, level, protocol, etc., and the transmission code system is also ASCli JIS8゜JIS7. EBCDIC
In addition to various codes such as , EBCDTK, etc., there is also transparent data transmission that does not use codes. Therefore, supporting various transmission codes is a major feature of a general-purpose serial transmission monitor device. However, supporting many transmission codes using software has the problem of long processing time, as described above, which poses a problem when monitoring high-speed transmission. In other words, since the monitor device must prioritize the reception of data on the serial transmission path, display processing including code conversion is neglected, and the display is delayed relative to the actual received data, making it difficult for the user to use. Become something. - According to the old invention, the software processing up to storing display data in the video RAM can be simplified and does not need to depend on the code system. The only thing that depends on the code system is the switching of the character generator, and the real-time display performance of the monitor device is improved. Furthermore, if the user decides to use a character generator that stores display patterns corresponding to a unique code system, it becomes possible to monitor specific transmissions, such as secret transmissions, without changing the software.

[Brief explanation of drawings]

FIGS. 1(A) and 1(B) are block diagrams showing the main configurations of different embodiments of the present invention, and FIG.
FIG. 2 is a block diagram of a conventional device corresponding to FIG. L digital transmission line, D ■: Transmission data, 1: Receiving circuit, 2: Microprocessor (μP), 3: RAM, 4
:Video RAM, 6:Display control circuit, 7:Display device, 8:
Code setting circuit, 11 (IIA, 11B): CG switching circuit, CGA (CGAI to CGA3), CGB: Character generator. ” Fang Figure 1 (B) Figures 4 and 2

Claims (1)

[Claims] 1) A video RAM having a storage area corresponding to one screen of the display means and storing data to be displayed on the display means for each data code, and sequentially transmitting data on a serial transmission path. In a serial transmission monitor device that performs operations such as performing simple processing on this transmitted data as necessary while inputting it, and storing data to be displayed in the video RAM and displaying it on the display means, the video RAM a character generator that stores, for each of a plurality of code systems, a display pattern for each data code according to a code system to which each data code of display data stored in the display data is based; and a character generator that specifies the code system in advance. means for enabling only the character generator corresponding to this code system; and displaying a display pattern corresponding to each data code in the video RAM on the display means via the enabled character generator. A serial transmission monitor device comprising: a means for displaying information.