JPH0435255A - Transmission terminal equipment - Google Patents

Abstract

PURPOSE:To send a reason of improper command message by analyzing a received command message so as to discriminate whether or not the content is proper, generating when improper a fault reply message and generating when proper a normal reply message and sending the message. CONSTITUTION:A data analysis section 4A discriminates whether or not a received command message sent from a central control monitor and received by a reception section 3 is addressed to its own station and discriminates whether or not the command content in the command message is proper when addressed to its own station. Then a reply message generating section 6A generates a fault reply message when the content of the command message is improper and generates a normal reply message when the content of the command message is proper and sends the result via a transmission section 7. Thus, the reason of improper command message is sent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission terminal device for inputting and outputting analog data, pulse data, digital data, etc.

[Conventional technology] The configuration of a conventional example will be explained with reference to FIG.

FIG. 4 is a block diagram showing a conventional transmission terminal device.

In FIG. 4, a conventional transmission terminal device (2) is connected to a receiving section (1) connected to a central monitoring device (1) via a transmission line.
3) and a data analysis unit (
4), a data processing section (5) connected to this data analysis section (4) and inputting, for example, analog data, and a response message generation section (6) connected to this data processing section (5),
The response message generating section (6) is connected to a transmitting section (7). Note that the output side of the transmitter (7) is connected to the central control and monitoring device (1) via a transmission line.

Next, the operation of the conventional example described above will be explained.

A command message transmitted from the central control and monitoring device (1) is received by a receiving section (3), and the contents of the command message are analyzed by a data analysis section (4). For example, if the command message is a request to input analog data, the data processing section (5) inputs the corresponding analog data.

Based on the input analog data, a response message is generated by the response message generation section (6) and transmitted to the central control and monitoring device (1) by the transmission section (7).

[Problems to be Solved by the Invention] In the conventional transmission terminal device as described above, there is no response when the command message is inappropriate, so it is difficult to determine whether the content of the command message is inappropriate or not. There was a problem in that the central control and monitoring device could not determine whether the transmission line between the transmission terminal devices was unresponsive due to hardware such as wires.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a transmission terminal device that can transmit the reason for the inappropriateness of a command message.

[Means for Solving the Problems] A transmission terminal device according to the present invention includes the following means.

[1] A data analysis unit that analyzes the command message received via the reception unit and determines whether the contents are inappropriate.

[2] If the content of the command message is inappropriate, an abnormal response message is generated, and if the content of the command message is compatible, a normal response message is generated and sent via the transmitter. Response message generator to send.

[Operation] In the present invention, the data analysis section analyzes the command message received via the reception section, and determines whether the contents are inappropriate.

Then, the response message generation unit generates an abnormal response message when the contents of the command message are inappropriate, and generates a normal response message when the contents of the command message are compatible. and is transmitted via the transmitter.

[Embodiment] The configuration of an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram showing an embodiment of the present invention, which includes a receiving section (3), a data processing section (5), and a transmitting section (7).
is exactly the same as that of the conventional device.

In FIG. 1, one embodiment of the present invention has a device that is exactly the same as the conventional device described above, and has an input side connected to a receiving section (3) and an output side connected to a data processing section (5). Data analysis section (4A) and this data analysis section (4A)
and a response message generation section (6A) whose input side is connected to the data processing section (5) and whose output side is connected to the transmission section (7).

FIG. 2(a) shows the structure of a command message consisting of a priority code, own address, partner address, control code, stationery, command contents, data, and frame check character, and FIG. The structure of the response message for an abnormality is shown in FIG. This figure shows the structure of a normal response message consisting of an address, a control code, a message, command contents, data, and a frame check character.

The priority code indicates the priority of the message, and in the case of a collision between messages (for example, when there are multiple central control monitoring devices and they are simultaneously transmitting to the same transmission terminal device), the priority code is the highest priority. The one that sent the message survives, and the others stop transmitting.

Furthermore, the stationery indicates the contents of the command and the number of bytes of data, and the frame check character is used for error control.

Next, the operation of the above-described embodiment will be explained with reference to FIG.

FIG. 3 is a flowchart showing the operation of one embodiment of the present invention.

In steps (10) to (11), the data analysis section (
4A) determines whether the command message shown in FIG. 2(a) transmitted from the central control and monitoring device (1) and received by the receiving section (3) is addressed to the local station.

The self-address of this command message is the central control monitoring device (1)
address, and the destination address is the transmission terminal device (2A
) address. The processing described below is executed only when the other party's address is addressed to the local station.

In steps (12) to (13), it is determined whether the command contents of the command message are inappropriate. If it is unsuitable (error) (YES), for example, if this transmission terminal device (2A) is for inputting analog data, but the command content is a request for input of pulse data, it is determined to be unsuitable and the transmission terminal device (2A) is for inputting analog data. As shown in , a response message for command abnormality is generated. Here, the command content of the command abnormality response message is sent to the central control monitoring device (1).
The error bit in the control code is set to ON (error present). Normally, this error bit is OFF (no error), and the error bit is transmitted from the central control and monitoring device (1) with the error bit OFF. An error code indicating that the command is abnormal is also added. If the command contents are compatible (NO), proceed to the next step.

In steps (14) to (15), it is determined whether the data in the command message is inappropriate. If not suitable (YES)
For example, although this transmission terminal device (2A) is for 4CH (channel) analog data input, the data is 5C.
If H is indicated, it is deemed inappropriate and a response message indicating data abnormality is generated as shown in FIG. An error code indicating that the data is abnormal is also added. The data error response message is the same as the command error response message, and only the error code is different. If the data is compatible (No)
Proceed to the next step.

In steps (16) to (17), if the contents of the command message are normal, after executing data processing according to the contents, a normal response message is sent as shown in FIG. 2(c). generate. In this normal response message, the error bit in the control code remains OFF (no error), the command content remains unchanged, and the data is analog data input from the outside.

In step <18), the abnormal or normal response message is transmitted to the central control and monitoring device (1) via the transmitter (7). At this time, the self address of the response message is the address of the transmission terminal device (2A), and the destination address is the address of the central control and monitoring device (2A).

As described above, in one embodiment of the present invention, when the contents of a command message are inappropriate, the reason for the inappropriateness is sent back to the sender, so that the central control monitoring device ( ) side can check the contents of the command message. This has the advantage of being able to determine whether the hardware is defective or not. In addition, in the case of a system in which there are many types of transmission terminal devices connected to the central control and monitoring device (1), when some operate and others do not operate depending on the contents of the command message, it becomes even more powerful. Demonstrate.

In the above embodiment, the explanation was given for inputting analog data, but it can also be used for inputting digital data or pulse data.
Alternatively, similar behavior can be expected when applied for output.

Further, by dividing the error code into smaller pieces, details of the inappropriateness (error) can be transmitted to the central control monitoring device W(1).

[Effects of the Invention] As explained above, the present invention includes a data analysis unit that analyzes a command message received via a receiving unit and determines whether the content is inappropriate, and a data analysis unit that analyzes a command message received through a reception unit and determines whether the content of the command message is inappropriate. a response message generation unit that generates an abnormal response message when the content of the command message is compatible, and generates a normal response message and transmits it via the transmission unit. Therefore, the reason for the inappropriateness of the command message can be transmitted, and the operation of the central control and monitoring device can be assisted.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of this invention, FIG. 2 is an explanatory diagram showing a message of an embodiment of this invention, and FIG. 3 is a flowchart showing the operation of an embodiment of this invention. Fourth
The figure is a block diagram showing a conventional transmission terminal device. In the figure, (2A) transmission terminal device, <3) receiving section, (
4A) - data processing unit, (5) data processing unit, (6A) response message generation unit, (7) transmission unit. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] a data analysis unit that analyzes the command message received via the reception unit and determines whether the content is inappropriate; and a data analysis unit that generates an abnormal response message when the content of the command message is inappropriate; 1. A transmission terminal device comprising a response message generation unit that generates a normal response message and transmits it via a transmission unit when the contents of the command message are compatible.