JPS60163552A - Serial transmission monitor - Google Patents

Abstract

PURPOSE:To attain ease of analysis of serial data over wide range by analyzing a received serial data according to protocol, converting it into a readable data and displaying or recording at least the data. CONSTITUTION:A CPU5 reads that the protocol of a serial transmission line to be supervised is inputted by an operating board 6 and sets initially it to a data reception circuit 7. The serial data generated on the transmission line is received by the circuit 7 and converted into a parallel data. Then the circuit 7 outputs a signal A informing the incoming of data to the CPU5, which receives the signal A and then receives a data transmitted successively from the circuit 7 and reads the kind of the incoming data by the operation of the keyboard 6. The data is converted into a data according to the preset display format and stored (8). Then the CPU5 displays the converted data to an external display circuit 10 or records it in an external memory 12.

Description

[Detailed Description of the Invention] [Technical Field to Which the Invention Pertains] The present invention relates to a serial transmission monitoring device that receives and monitors serial data transmitted through a serial transmission path connecting between devices or two stations such as a system. especially,
The received serial data is visualized in chronological order and output to an external display device or recording device.

[Prior art and its problems] In general, in serial data transmitted through a serial transmission line, the previous and subsequent data interact with each other in chronological order, so observing only the data signal waveform received at each point in time will not reveal the data. Not only is the content difficult to understand and understand, but the data structure itself is such that, in addition to the information bits in the JIS 8-bit format, start bits, parity bits, end bits, etc. are added before and after to increase reliability. This makes it even more difficult to understand.

Therefore, with regard to serial data, it is not possible to determine what kind of information is being transmitted by simply observing the received signal waveform with a synchroscope or by analyzing the received signal waveform with a data recorder.

In order to observe such serial data, a monitor device called an online scope or an online simulator has conventionally been used. The functions of this type of conventional serial data monitor device are shown in the following table.

Note that, as described later, the serial transmission monitoring device according to the present invention has a function similar to that of an online scope.

If this type of online scope or online simulator is used, serial data can generally be converted and displayed in an easy-to-understand format according to its chronological nature, so that the information content can be visually checked. Therefore, it is easy to judge what kind of information is being transmitted by serial transmission between devices or in the system m1.
This is extremely useful for analyzing behavior between devices or systems. Additionally, the main difference between online scopes and online simulators is that they have a data sending function, as seen from the table above, and therefore, the simulators can be used in combination with equipment or systems to conduct operational tests. be.

However, online scopes and online simulators, which are conventional serial transmission monitoring devices, have the following problems in use.

(2) The equipment is large and generally expensive. That is,
It is large because it has a built-in CR7 display device and has other functions, and it is also expensive because it has many components that are used only as a serial transmission monitor.

2) Since the usage form of serial transmission lines is generally limited and each form is dedicated, it is difficult to use a monitor device for various types of serial transmission lines.

3) Because the device is large, it is inconvenient to bring it to a test site for equipment, systems, etc., and it is especially inconvenient to bring it to a test site to immediately respond to trouble occurrences for trouble analysis. It is.

4) In general, it does not have the function to monitor the serial transmission path for a long time, nor does it have the function to check the transmitted data retrospectively, so it is inconvenient for testing and adjusting the operation of equipment and systems. be.

[Object of the Invention] An object of the present invention is to eliminate the above-mentioned conventional problems, and to provide a function capable of receiving data on a serial transmission line through various interfaces and displaying and outputting the data. The object of the present invention is to provide a serial transmission monitor device that is small and inexpensive.

Another object of the present invention is to provide a serial transmission monitoring device that is easy to test and adjust the operation of devices and systems that perform serial transmission, and that can be used continuously for long periods of time.

Still another object of the present invention is to provide a serial transmission monitor device that can reproduce received and recorded serial data as needed, or can retrospectively display and output the received and recorded serial data.

[Summary of the Invention] The serial transmission monitoring device of the present invention is a device that receives and monitors serial data serially transmitted from one station to another, and analyzes the received serial data according to the protocol or data format of the serial transmission. The device is characterized in that it converts the data into readable data and outputs the data to at least one of a display device and a recording device externally attached to the device.

[Embodiments of the Invention] The present invention will be described in detail below with reference to the drawings.

First, FIG. 1 shows an example of a configuration and arrangement in which the device of the present invention is inserted into a serial transmission line and used to monitor serial data transmission.

In the configuration shown in FIG. 1, a branching device 3 is inserted between a data line terminating device 1 such as MODEN and a data terminal device 2, and a branching device 3 is inserted between a data line terminating device 1 such as MODEN and a data terminal device 2. R3-232G or R3-42
Data transmitted serially in bits in a signal format such as 2 is branched and extracted, and is displayed and monitored by the monitor device 4 of the present invention.

FIG. 2 shows an example of the basic configuration showing the above-mentioned features of the serial transmission monitor device of the present invention used in such a configuration.

In the configuration shown in the second figure, there is a data receiving circuit 7 for receiving data on a serial transmission path, an operation board 6 for setting the serial transmission protocol or data format function, and a data receiving circuit 7 for receiving data on a serial transmission line, an operation board 6 for setting the serial transmission protocol or data format function, In addition to analyzing and converting data into easy-to-read display data, it also controls each of the other component circuits.

Central processing unit (CPU)5. and a data storage device 8 that stores display data obtained by converting the received data. Furthermore, a display output circuit 9 for outputting display data to an external display device 10 using a cathode ray tube, electroluminescence, laser, plasma, printer, etc., and an external memory device 12 using a cassette magnetic tape, magnetic disk, etc. By adding an external memory output circuit 11 for outputting display data, the received serial data can not only be displayed externally, but also stored in an external memory device under the control of the CPU 5. It is.

Furthermore, since this monitor device has a built-in data storage device 8, it is possible to monitor data transmission even on a high-speed data transmission path.

FIG. 3 shows an example of the configuration of the apparatus of the present invention, partially showing the basic configuration shown in the second figure in detail.

In the m configuration shown in Figure 3, the central processing unit (CPU5
) controls each circuit device and analyzes received data according to a program written in the read-only memory 13. The operation board 6 inputs information and protocols for various operation control operations such as display and recording, and has keys KE each consisting of a switch and a diode D.
It consists of a key matrix in which Y is arranged in rows and columns.

The data receiving circuit 7 converts the received serial data into parallel data. The data storage device 8 comprises a random access memory (RAM). external display output circuit 9,
External display device 10, external memory output circuit 11, and external memory device 12 are as described above with respect to FIG.

The serial transmission monitor device of the present invention having the configuration shown in FIG. 3 operates as follows.

The CPU 5 reads the protocol of the serial transmission path to be monitored that is input from the operation board 6, and initializes it in the data receiving circuit 7. Serial data generated on the serial transmission path is received by the data receiving circuit 7 and converted into parallel data of, for example, 8 bits.

The data receiving circuit 7 outputs a signal A to the CPU 5 to notify that data has arrived. Having received the signal A, the CPU 5 subsequently receives the data sent from the data receiving circuit 7, reads the type of the incoming data by operating the operation board 6, and displays the data according to a preset display format. The conversion is performed and stored in a random access memory forming the data storage device 8.

Furthermore, the CPU 5 transfers the converted data to the external display device 10 via the display output circuit 9, or
External memory device 12 via external memory output circuit 11
Transfer to and record.

Note that the CP[I5 reads the setting command of the operation code 6 to select which of the external devices 10 and 12 to output the analyzed and converted data to.

The above-described operational aspects of the serial transmission monitoring device of the present invention are shown in FIGS. 4 and 5 in the form of a fuco chart.

In the serial transmission monitor device of the present invention, as described above, the incoming serial data is sent to the data receiving circuit 7,
Central processing unit (CPU) 5. Data storage device (R
AM) 8. Display output circuit 9, external display device w10, external memory output circuit 11, external memory device] It is normal that the data is analyzed according to the flowchart shown in Figure 4 through the route 2, and then displayed or recorded. .

However, when monitoring a high-speed data transmission path that does not fit in time with the acquisition of incoming data and the operation of an external device, follow the 20-chart shown in Figure 5.
Interrupt processing is performed with the top priority being to capture and store incoming data in the data storage device (RAM) 8, and during idle periods when there is no data on the serial transmission line 2, the data storage device The data stored in 8 is read out, subjected to necessary subsequent processing, and then output to an external display device 10 or memory device 12.

That is, in the flowchart shown in FIG. 4, as the main routine, the operation hoard 6 is
In the next step S2, the contents of the protocol are determined. Depending on the result of the determination, in steps S3, S4, and S5, the data receiving circuit 7 is set to synchronous, asynchronous, and holding modes, respectively.

Next, the process advances to step S6, where it is determined whether or not there is an input character. If there is no input character, the process advances to step S7 to repeatedly wait for an interrupt.

If there is an input character, the process advances to step S8, where the accumulated data is read from the data storage device (RAM) 8.

In the next step S8, the output designation from the operation board 6 is read, and then, in step SIO, the content of the output designation is determined, and according to the result of the determination, step S
Proceed to either S12 or S13.

In these steps Sll, S12 and S13, an external memory device (GMT) 12, an external display device (
After outputting the accumulated data to the CRT))0 and both, the process returns to step S6.

The flowchart shown in FIG. 5 is a data signal routine, and in step S21, the data receiving circuit 7
The incoming data is taken in, and the display format set by the operation board 6 is read in the next step S22. Next, in step S23, the content of the display format is determined. Depending on the result of the determination, the process proceeds to one of steps S24 to S28, where the captured serial data is respectively ASC:ii code, binary code, HExml-code, EBCDic=1-code, JI code.
Convert to S8=+-do. Next, the process proceeds to step 5211, where the conversion data is stored in the data storage device (RAM).
8, and then the process moves to step S6 in the main routine shown in FIG.

Next, the timing of the serial transmission monitoring operation of the device of the present invention described above is determined at the sixth timing for the serial transmission line, the A signal generated in the data receiving circuit 7, and the CPU 5, respectively.
They are shown in contrast to each other in Figures (A), (B) and (G).

That is, among the serial data sequentially transmitted on the serial transmission path, the first data (A) is taken into the data receiving circuit 7 as a basic operation. Since the data reception signal A has not arrived from the data reception circuit 7 at that time, the reception data (A) is displayed as is.

On the other hand, sequentially consecutive data (B), (C),
Regarding (D), the data reception signal A for data (B) is received from the data reception circuit 7 and the data (B) is R.
At the time when the data is stored in AM8, the data reception signal A for the next data (C) is being issued from the data reception circuit 7, so the stored data (B) is not displayed.
Data (C) is taken in and stored in RAM8. Similarly, at the time when data (D) is captured and stored, no subsequent data has been received, so the data reception signal A is not generated, and under the control of the CPU 5,
Data accumulated so far (B), (C), (
D) is displayed continuously.

In the serial transmission monitor device of the present invention, all the serial data generated on the serial transmission path is temporarily stored on the data storage device (RAM) 8, so that the operation board 6 stores the stored contents of the data storage device (RAM) 8. If you set the function to read the central processing unit (C
PU) 5 can retroactively output accumulated data in a data storage device (RAM) 8 to external devices 10 and 12 in response to instructions from an operation board 6.

The flowchart of this accumulated data display routine is shown in the seventh section.
As shown in the figure. In the illustrated flowchart, if the data storage device (RAM) 8 can store data for 1.00 screens of 1° of the external display device, the key matrix of the operation board 6 will contain 1 to 32H for ±50 screens. shall be set. Here, if the MSB is set, accumulated data from the past will be displayed, and if the MSB is not set, incoming accumulated data from that point onwards will be displayed.

First, in step S31, the setting value S of the operation board 6
Read DA. Here, suppose that the CPU 5 reads the set value 82)1 as data for two screens, and then in step S
The process proceeds to step 32, where it is determined whether the MSB is vertical. Here, if the MSB is set, it is recognized in step S34 that past data is displayed, and the current RA
After subtracting the address for two screens from the M address to calculate the start address of the past data to be displayed, the process moves to step S35. On the other hand, if the MSB is not set, the process proceeds to step S33 to calculate the current RAM address, and then proceeds to step S35.

In either case, clear the count to O.

Next, the process proceeds to step S38, where the data storage device (R
AM) Read the accumulated data from 8 and proceed to the next step S3.
At step 7, the display designation on the operation board 6 is read. In the next step S38, step S38. S40. Proceed to one of S41. These steps S39. In S40 and S41, the accumulated data is output to the external memory device 12, the external display device 10, and both of them, respectively. After that,
Proceeding to step S42, the count is incremented by one.

Next, the process advances to step S43, where the count reaches 20.
It is determined whether the count reaches 00 or not, and the above process is repeated until the count reaches 2000.

In the serial transmission monitor device of the present invention having the above-mentioned functions, since the display device is externally attached, the device can be constructed in a small size and at low cost.

Further, according to the present invention, since the external memory output circuit 11 is provided, even when used at a test site for equipment or systems, only the small monitor device of the present invention and an external memory device are brought in. After performing the necessary monitoring work, the accumulated data is brought back and displayed on an external display device, making it possible to perform the necessary trouble analysis in an extremely convenient manner.

Furthermore, since the monitor device of the present invention is also provided with a data storage device, it is possible to perform necessary monitoring operations by once storing data on the high-speed serial transmission path.

It should be noted that with respect to the external memory device, it is possible to record data dating back to quite a while ago, so it is possible to easily analyze past data when analyzing data.

[Effects of the Invention] As is clear from the above description, according to the present invention, the following remarkable effects can be achieved.

(1) Since a display device and a memory device can be added as external devices to the serial transmission monitor device, analysis of a wide range of serial data can be made relatively easily by using any combination of the monitor device, display device, and memory device. It can be carried out.

(2) Since top priority is given to storing serial data in the memory device built into the monitor device, data transmission can be monitored even on a high-speed serial transmission path.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing how the serial transmission monitor device is used, FIG. 2 is a block diagram showing an example of the basic configuration of the serial transmission monitor device of the present invention, and FIG. 3 is a detailed configuration example thereof. FIG. 4 is a flowchart showing the main routine of the operation, FIG. 5 is a flowchart showing the data reception routine of the operation, and FIGS. 6(A) to (C) are the various steps of the operation. FIG. 7 is a time chart showing an example of the timing, and a flow chart showing the accumulated data display routine of the operation. DESCRIPTION OF SYMBOLS 1... Data line termination device, 2... Data terminal device, 3... Branching device, 4... Monitor device, 5... Central processing unit (CPU), 6... Operation board, 7...Data receiving circuit, 8...Data storage device (RAM), 9...Display output circuit, IO...External display device, 11...External memory output circuit, 12...External memory Device, 13... Read-only memory. Patent applicant: Fuji Electric Manufacturing Co., Ltd. ++11. :(Yoshi Tani, patent attorney)

Claims (1)

[Claims] (1) A device for receiving and monitoring serial data serially transmitted from a station to another station, capable of analyzing and reading the received serial data according to the protocol or data format of the serial transmission. What is claimed is: 1. A serial transmission monitor device, characterized in that the data is converted into data and outputted to at least one of a display device and a recording device externally attached to the device. 2. The device according to claim 1, further comprising a memory means, which receives the serial data preferentially and temporarily stores the serial data or the readable data in the memory means each time the serial data is received. ,
A serial transmission monitor device characterized in that output is performed sequentially during an idle period of serial transmission. (Hereafter, margin)