JPS6318450A - Abnormal operation detector for terminal equipment - Google Patents

Abstract

PURPOSE:To improve the processing speed of a protocol converter, by providing a protocol converter which regards a telegraphic message arriving from an external device invalid and cancels the message while the power supply to a terminal is disconnected by means of a power-saving detecting signal from the terminal. CONSTITUTION:When a terminal 32 receives a reception forcing instruction from a network and center 31 through a protocol converter 33, the terminal 32 automatically sends an answer indicating that the reception forcing instruction is accepted to the converter 33. Then the converter 33 is set to a waiting state which waits for an interruption accepting telegraphic message from the terminal 32. If the operator of the terminal 32 sets the power source to the power-saving mode under such state, the converter 33 detects that the power supply to the terminal 32 is set to the power-saving mode by means of its built-in power-saving mode detecting timer. Upon detecting this, the converter 33 cancels the interruption forcedly accepting telegraphic message waiting state and, simultaneously, its holding forcing telegraphic message. Therefore, it can be done to make both the device 33 and terminal 32 synchronous to each other and, at the same time, it becomes unnecessary to check the business header of any telegraphic message from the terminal 32. Accordingly, the communication processing speed of the protocol converter 33 can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a protocol conversion device that is installed between a center and a terminal that have different communication protocols, and is used in a protocol conversion device or the like to convert communication protocols. This invention relates to a detection device.

Conventional technology Fig. 3 is a block diagram of a conventional abnormality detection device for terminal equipment, Fig. 4 is a diagram of the transmission format of a response message from a conventional example from a center, etc., and Fig. 5 is a diagram of a transmission format of a response message from a center, etc. according to the conventional example. FIG. 6 is a diagram of the transmission format of the forced reception message from the conventional example in the power saving mode, and FIG. 7 is a diagram of the transmission format of sequence abnormality detection of the conventional example.

In Figures 3 to 6, the meaning of the transmission code is JISC6
Based on 362. POLL is polling,
This shows a process for prompting a data station to transmit to only one station at a time. SEL is selecting, and indicates processing for prompting one or more data stations to receive data. EOT is a transmission end character, STX is a text (telegram) start character, E'rx is a text end character, DI and g are transmission control extension characters, ACK is an acknowledgment character, and NACK is a negative response character.

In FIG. 3, 1 is a communication network and center that connects with a plurality of terminals 2 and transmits and receives data respectively, 3 is a signal 4 for basic transmission control sent from the terminals 2, and a communication network and center. This is a protocol conversion device that enables communication by converting signals 5 and other communication protocols sent from 1 and 5 respectively. In FIG. 4, reference numeral 11 indicates an interim message from the terminal to the center etc. via the protocol conversion device, and 12 indicates a reply message from the center etc. to the terminal in response to the interim message 11. In addition, in Fig. 6, 13 (interrupt reception message generated when the operator of the terminal presses the forced interrupt reception key in response to a forced reception instruction from the center, etc.), and 14 (response message for reception from the terminal) represents the message sent from the center etc. in response to the message.

The transmission sequence between the protocol converter 3 and the terminal 2 is as shown in FIGS. 4 and 5. FIG. 6 shows the relationship between the power state of the terminal 2 and the transmission sequence at that time. In FIG. 6, reference numeral 16 indicates a state in which the power of the terminal device is temporarily switched from normal mode to power saving mode and then returned to normal mode, and reference numeral 16 indicates a transmission control unit when the power is returned from power saving mode to normal mode. 17 indicates the process by which the operator operates the terminal to create a makeshift message to the center, etc., and 18 indicates the completion of the creation of the makeshift message. timing, 1
9 indicates that the protocol conversion device recognizes the request message as an interrupt response message, 20 indicates that the terminal recognizes the corresponding message as a makeshift message, and 21 indicates that the protocol conversion device recognizes the corresponding message as a compulsion message. 22 things to do
indicates that the terminal recognizes the corresponding message as a response message for an arrangement.

The operation of FIG. 6 is shown below. First, a forced reception instruction (forced 5EL) is sent from the center etc. 1 via the protocol conversion device 3.
), the terminal 2 sends an automatic response (DLE・() to the protocol converter 3 indicating that it has accepted the forced reception instruction. However, if the operator of the terminal 2 switches the power supply from the normal mode to the power saving mode 15 and then returns to the normal mode, all parts of the terminal 2 other than the transmission control section will be in the initial state initialization mode 16. becomes.

(Note that even if the power supply of the terminal device 2 is set to power saving mode 15, the transmission control unit operates normally, so the protocol converter 3
Terminal 2's EOT-EOT response to POLL from Terminal 2 continues. ) Subsequently, when the operator of the terminal device 2 creates a makeshift message 17 to the center etc. 1 and sends it to the POLL from the protocol conversion device 3, the recognition of this message is changed between the protocol conversion device 3 and the terminal device 2. It's different then. The protocol conversion device 3 recognizes the corresponding message 17 as an interrupt reception message 19, and the terminal device 2 recognizes it as a makeshift message 20. Therefore, the protocol converter 3 also treats the response message to the corresponding message 17 as a forced message.

The terminal device 2 will recognize this as a response message from the center or the like.

Conventionally, as a means to solve this problem, the protocol converter 3 checks the business header of the message sent from the terminal 2 and logically detects an abnormality in the sequence.

FIG. 7 shows a conventional method.

In FIG. 7, 23 represents the timing at which the makeshift message is sent from the terminal, 24 the makeshift message, and 26 the reply message to the makeshift message 241.

When the makeshift message 23 in FIG. 7 is sent from the terminal 2 to the protocol conversion device 3, the protocol conversion device 3 checks the business header of the message to detect an abnormality. The protocol conversion device 3 discards the forced message 21 that it held, and recognizes the corresponding message as a temporary message 246 from the terminal device 2. In this manner, the conventional method of checking the business header of the message also detects abnormal operation of the terminal and synchronizes the operations of the protocol conversion device 3 and the terminal 2.

Problems to be Solved by the Invention However, in the conventional method of checking the business header of messages sent from the terminal, all messages sent from the terminal are checked, which slows down the processing of the protocol conversion device. was there.

The present invention aims to improve the processing speed of the protocol conversion device by omitting this check.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a protocol conversion device that converts signals exchanged with an external device with a terminal into a desired communication protocol, and a power-saving method from the terminal. It is equipped with a function to detect a detection signal, and is configured to discard messages received from external devices as invalid during power saving.

According to the present invention, with the above configuration, the protocol conversion device can immediately detect a change in the power state of the terminal, and synchronize the operation of the protocol conversion device with the operation of the terminal, thereby enabling the protocol conversion device to immediately detect a change in the power state of the terminal, and synchronize the operation of the protocol conversion device with the operation of the terminal. Since it is not necessary to check all of the above, the processing speed of the protocol conversion device can be improved.

Embodiment FIG. 1 is a transmission format diagram of a device for detecting an abnormality in operation of a terminal according to an embodiment of the present invention, and FIG. 2 is a block diagram of the same embodiment.

In FIG. 2, 31 is connected to a plurality of terminals 32,
A communication network and sensor P, 3 that transmit and receive data, respectively.
Reference numeral 3 denotes a protocol conversion device that converts the basic transmission control signal 34 sent from the terminal 32 and the signal 36 based on other communication rules sent from the communication network and center 31 to enable communication. . Reference numeral 36 denotes a power saving detection signal for detecting whether or not the power supply of the terminal 32 is in a power saving mode. In FIG. 1, 37 is a power saving state in which the power of the terminal 32 is once changed from normal mode to power saving mode and then returned to normal mode, and 38 is a state in which the power is changed back from power saving mode to normal mode. The initialization state 39 is where the state of each part of the terminal 32 except the transmission control section is initialized, and the message creation state 40 is an intermediate state where the operator operates the terminal 32 to create a makeshift message to the center etc. 31. A creation completion state indicating the timing of completion of creation of the temporary message, 41 indicates the temporary message, 42 indicates a reply message to the temporary message 41, and 43 indicates the protocol conversion device 33 detects the power supply of the terminal 32 by the power saving mode detection timer. This represents the power saving detection timing for detecting that the device is in power saving mode.

Next, the operation of the above embodiment will be explained. In the above embodiment, first, when the terminal 32 receives a forced reception instruction (forced SEL) from the center etc. 31 via the protocol converter 33, the terminal 32 automatically responds 44 to the effect that it has accepted the forced reception instruction. (DLE・() is sent to the protocol conversion device 33. The protocol conversion device 33 enters a message waiting state 45 when accepting an interrupt from the terminal device 32. At this time, the operator of the terminal device 32 changes the power from the normal mode to the power saving mode. mode, the protocol converter 33 detects that the power supply of the terminal 32 has entered the power save mode using the built-in power save mode detection timer.At this point, the protocol converter 33 waits for a message before accepting a forced interrupt. The state is canceled 46 times, and the forced message held at the same time is discarded.

Therefore, the operations of the protocol conversion device 33 and the terminal device 32 can be synchronized, and at the same time, there is no need to check the business header of the message from the terminal device 32, and the communication processing of the protocol conversion device 33 can be improved. .

Effects of the Invention As is clear from the above embodiments, the present invention detects a power saving detection signal from a terminal in a protocol conversion device that converts signals exchanged between the terminal and an external device into a desired communication protocol. The protocol converter immediately detects a change in the power status of the terminal, and changes the operation of the protocol converter and the terminal. This has the effect that the processing speed of the protocol conversion device can be improved because it is not necessary to check all the messages from the terminal.

[Brief explanation of the drawing]

FIG. 1 is a transmission format diagram of a device for detecting an abnormality in the operation of a terminal device according to an embodiment of the present invention, FIG. 2 is a block diagram of the same embodiment, and FIG. Figure 4 is a transmission format diagram of a reply message from a center etc. according to the same conventional example, Figure 5 is a transmission format diagram of a reception forced message from a center etc. according to the same conventional example, and Figure 6 (
1 is a diagram of the transmission format in the t-saving mode of the conventional example. FIG. 7 is a diagram of the transmission format of sequence abnormality detection in the conventional example. 31°°゛Communication network and center, 32...Terminal, 33
...Protocol conversion device, 34... Signal for HESIC transmission control, 36... Power saving detection signal, 36...
Signals according to other communication regulations, 37...power saving state,
3B...Initialization state, 39...Message creation state, 40
...Creation completion status, 41...Memory message, 42.
...Response message, 43...Power saving detection timing, 44
...Automatic response, 45... Forced interrupt acceptance is in waiting state, 46... Interrupt acceptance is released from waiting state. Name of agent: Patent attorney Toshio Nakao and 1 other person 2A
2 figure

Claims (1)

[Claims] A terminal device that transmits data with the outside by means of basic transmission control means, and can manually turn off the power to parts other than the transmission control part when not in use; and a terminal device that is installed between this terminal device and an external device, When the terminal is powered off by the power saving detection signal from the terminal, the message received from the external device is invalidated and discarded, and the operation with the terminal is mutually converted. An operation abnormality detection device for a terminal device, comprising a protocol conversion device for matching the protocol.