JPH05191476A - Protocol analyzer - Google Patents

Abstract

PURPOSE:To quickly monitor and simulate the flow of transmission data together with a communication test by regenerating a protocol based on the specifications. CONSTITUTION:The flow of the data transmitted through a transmission line 13 between the measured devices 11 and 12. The data transmitted from the device 11 through the line 13 are fetched into a buffer memory 6a through a switch 10a, 8 receiver 9a and a communication control part 7a. Meanwhile the data transmitted from the device 12 through the line 13 are fetched into a buffer memory 6b through a switch 10b, a receiver 9b end a communication control part 7b respectively. Then the transmission data flows stored in both memories 6a and 6b are shown on a display device 3 through a central processing part 2 for reference with operation of a keyboard 4 and under the control of the part 2 and a simple program memory 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a data transmission system having a plurality of terminals, monitors a data flow on a transmission line, and simulates one terminal to perform a communication test with the other terminal. Regarding protocol analyzer.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show the configuration of a conventional protocol analyzer.

3 and 4, this example has a central processing unit 2, a display device 3 for displaying data, and a keyboard 4 for setting parameters and performing a simple program input operation. Further, a simple program memory 5, a buffer memory 6 for transmitting and receiving data on an external transmission line, and communication control units 7a and 7b for controlling the baud rate, parity and the like are provided. Further, characteristic matching drivers 8a and 8b and receivers 9a and 9b connected to the transmission line, switches (SW) 10a for switching between the drivers 8a and 8b and receivers 9a and 9b during monitoring and simulation.
10b is provided.

Reference numerals 11 and 12 denote devices to be measured such as terminals, and reference numerals 13 and 14 denote transmission lines for data transmission.

Next, the operation of this configuration will be described.

In the example of FIG. 3, a protocol analyzer M is connected to the transmission line 13 connecting the device under test 11 and the device under test 12 to monitor the transmission data flow.

Bidirectional transmission data on the transmission line 13 includes switches (SW) 10a, 10b, receivers 9a, 9b,
It is taken into the buffer memory 6 through the communication control units 7a and 7b. Then, by operating the keyboard 4 and controlling the central processing unit 2 and the simple program memory 5, the transmission data is displayed on the display device 3 to monitor the transmission data flow.

In the example of FIG. 4, the protocol analyzer M simulates the device under test 11 through the transmission line 14 based on the contents of the simple program memory 5 input by the keyboard 4.

The transmission data from the device under test 12 is transmitted to one side of the transmission line 14, the switch 10b, the receiver 9b,
It is taken into the buffer memory 6 through the communication control unit 7b.
Further, simulated data by operating the keyboard 4 and controlling the central processing unit 2 and the simple program memory 5 is supplied to the device under test 12 through the other of the communication control unit 7a, the driver 8a, the switch 10a, and the transmission line 14, A simulation as the measuring device 11 is performed.

In this case, the buffer memories 6a,
6b is used only for referring to the data on the display 3.

[0011]

By the way, in the case of performing simulation with the protocol analyzer M of the conventional example,
A simple program with protocol specifications is created in a simple language prepared in advance in the protocol analyzer, and simulation is performed using this simple program. For this reason, if the protocol becomes a little complicated, it takes a lot of time to create the simple program, and there is a drawback that rapid development, inspection, and maintenance cannot be supported.

Further, the present invention has the drawback that it is difficult to completely reproduce a protocol according to specifications due to restrictions such as the types of text data patterns that can be handled by a simple program, the number of conditional statements, and the number of timer counters. It is an object of the present invention to solve such a problem and to provide a protocol analyzer capable of reproducing a protocol according to specifications and capable of promptly monitoring, simulating transmission data and performing communication test.

[0013]

To achieve this object, the present invention provides a protocol for monitoring the transmission data flow on a transmission line, or for simulating one terminal and performing a communication test with the other terminal. In the analyzer, a display means for displaying transmission data and control processing contents, an input means for setting parameters, a plurality of connections / communications for transmitting transmission data in a transmission direction in a transmission line and performing communication processing. The control means, a plurality of data buffers connected to the connection / communication control means and transmitting and receiving data bidirectionally, and monitoring the transmission data flow on the transmission line, or simulating one terminal and simulating the other terminal. Memory for the program that stores the control program for performing the communication test of the device and central processing that controls based on the control program It is those with a.

[0014]

Embodiments of the protocol analyzer of the present invention will be described below with reference to the drawings. 1 and 2 show the configuration of the embodiment. In the following text and in FIGS. 1 and 2, the same components as those in FIGS. 3 and 4 previously described are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1 and FIG. 2, in this example, a central processing unit 2, a display unit 3 for displaying data, a keyboard 4 for setting parameters and the like, and a central processing unit 2 for bidirectional data transmission / reception. A possible simple program memory 5 is provided. Further, data can be transmitted and received bidirectionally to and from the central processing unit 2, and buffer memories 6a and 6b provided independently for each direction of the signal under measurement, baud rate, parity processing and the like are controlled, and the buffer memories 6a and 6b are controlled. And communication control units 7a and 7b capable of bidirectionally transmitting and receiving data. Further, the drivers 8a and 8b for matching the characteristics with the transmission line between the devices to be measured, the receivers 9a and 9b, and the driver 8 by selecting the monitor mode or the simulation mode.
It has switches 10a and 10b for switching between a and 8b and receivers 9a and 9b.

In FIG. 1, the device under test 11,
The transmission data flow of the transmission line 13 between the devices under test 12 is monitored.

Transmission data from the device under test 11 on the transmission line 13 is taken into the buffer memory 6a through the switch 10a, the receiver 9a and the communication control section 7a.
Further, the transmission data from the device under test 12 on the transmission line 13 includes the switch 10b, the receiver 9b and the communication control unit 7.
It is taken into the buffer memory 6b through b.

Then, by operating the keyboard 4 and controlling the central processing unit 2 and the simple program memory 5, the transmission data flow stored in the buffer memories 6a and 6b is displayed on the display device 3 for reference.

In FIG. 2, the device under test 12 is shown here.
The protocol analyzer M simulates the device under test 11 through the transmission line 14.

The transmission data from the device under test 12 is transmitted to one side of the transmission line 14, the switch 10b, the receiver 9b,
It is fetched by the buffer memory 6a through the communication control unit 7b. Furthermore, the operation of the keyboard 4 and the central processing unit 2,
The simulation data controlled by the simple program memory 5 is transferred to the communication controller 7a, the driver 8a, and the switch 10.
a, and is supplied to the device under test 12 through the other side of the transmission line 14, and the device under test 11 is simulated by the program stored in the simple program memory 5.

[0021]

As is apparent from the above description, the protocol analyzer of the present invention is capable of transmitting data in a plurality of buffer memories for bidirectional data transmission / reception to the outside as it is as simulated data. , The protocol according to the specification can be reproduced, and the effect is that the transmission data flow can be quickly monitored, simulated, and communication tested.

In addition, when the text data of the device under test changes in various ways, there is an effect that the operator can save the labor of key-inputting these text data into the memory for the simple program.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining a configuration and an operation in a first embodiment of a protocol analyzer of the present invention.

FIG. 2 is a block diagram for explaining the configuration and operation of the second embodiment.

FIG. 3 is a block diagram for explaining the configuration and operation of a conventional protocol analyzer.

FIG. 4 is a block diagram for explaining another configuration and operation of a conventional protocol analyzer.

[Explanation of symbols]

 2 Central processing unit 3 Display device 5 Simple program memory 6a, 6b Buffer memory 7a, 7b Communication control unit 8a, 8b Driver 9a, 9b Receiver 10a, 10b Switch 11, 12 Device under test 13, 14 Transmission line M protocol analyzer

Claims (1)

[Claims] 1. A protocol analyzer for monitoring a transmission data flow on a transmission line or for simulating one terminal and performing a communication test with the other terminal, and display means for displaying transmission data and control processing contents. Input means for setting parameters, and transmitting in the transmission direction of the transmission data in the transmission line,
In addition, a plurality of connection / communication control means for performing communication processing, a plurality of data buffers connected to the connection / communication control means for bidirectional data transmission / reception, and a transmission data flow on the transmission line are monitored. Alternatively, a protocol analyzer including: a program memory that stores a control program for simulating one terminal and performing a communication test with the other terminal; and a central processing unit that performs control based on the control program.