JP3069409B2 - Self-diagnosis method of interrupt response time of multiplex transmission system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex transmission system used for a lighting control system or a security system in the field of home automation or building automation. The present invention relates to an interrupt response time self-diagnosis method for performing a self-diagnosis as to whether or not a system setting is satisfactory.

[0002]

2. Description of the Related Art A multiplex transmission system comprises a master unit 1 and a plurality of terminals 2 connected via a signal line L as a signal transmission medium, as shown in FIG. It is used for In this multiplex transmission system, a unique address is set for each of the terminals 2, and the base unit 1 transmits a transmission signal having a signal format shown in FIG. This transmission signal includes a synchronization signal SNC for detecting the start of transmission of the signal of the base unit 1 by the terminal device 2, a mode signal MD for defining the data contents of the subsequent address signal AD and the control signal CD, and a transmission destination terminal. An address signal AD indicating the unique address of the terminal 2, turning on a load connected to the terminal 2,
A control signal CD indicating control contents such as an OFF signal, an error detection signal FCC for detecting a transmission error of a transmission signal, and a return signal band RSP provided as a time period for returning a return signal from the terminal 2 to the base unit 1. Consists of

Normally, the master unit 1 transmits the above-mentioned transmission signal to each terminal 2
And signal transmission is performed. For example, the base unit 1 specifies the address of each terminal 2 by the address signal AD of the transmission signal, sequentially accesses each terminal 2 cyclically,
Signal transmission is performed between the parent device 1 and each terminal device 2 mutually. In this type of multiplex transmission system, when the terminal 2 urgently wants to send a reply signal to the master 1, as shown in FIG. 6, the terminal 2 synchronizes with the transmission timing of the synchronization signal SNC (pulse waveform). To send an interrupt pulse IP to request an interrupt. In the base unit 1 that has received the interrupt pulse IP, the mode signal MD of the transmission signal is set to the interrupt address polling mode and transmitted to specify the interrupt request terminal 2.

In the interrupt address polling for specifying the interrupt requesting terminal 2, the master unit 1 sets the address of the terminal 2 in the address signal AD and sequentially accesses each terminal 2 cyclically. When the interrupt request terminal 2 is accessed, data (for example, its own address) indicating that the interrupt request terminal 2 has made an interrupt request is returned to the return signal band RS.
Reply to master 1 to P. Therefore, the terminal 2 to which the master 1 has issued the interrupt request can be specified by the interrupt address polling.

[0005] When the interrupt request terminal 2 is specified in this manner, the master unit 1 sets the mode signal MD of the transmission signal to the monitoring mode and sets the address of the interrupt request terminal 2 to the address signal. Then, a reply signal is received from the interrupt request terminal 2. Then, the base unit 1 sets the mode signal to the response mode and transmits the mode signal to the interrupt request terminal 2, and stops the transmission of the interrupt pulse IP from the interrupt request terminal 2, thereby completing the interrupt processing. .

[0006]

By the way, the terminal 2 that issues this type of interrupt request requires a time (hereinafter referred to as this time) required for the master device 1 to perform an interrupt in response to the interrupt request. Are called interrupt response times.) Some of them need to be fast, and some do not need much response speed.

However, in the case of this type of conventional multiplex transmission system, the interrupt response time required when an interrupt request is actually made from the terminal 2 is determined by the interrupt response time required for the terminal 2. It was not possible to determine whether the response time was satisfactory. In other words, since the interrupt address polling is sequentially performed in the order set in the base unit 1 in advance, if the address of the terminal 2 is erroneously set to the address polled later by the interrupt address polling, the terminal 2 does not satisfy the interrupt response time required. Therefore, the responsiveness of the entire system is deteriorated.

[0008] The present invention has been made in view of the above points, and an object of the present invention is to provide a multiplex transmission system capable of self-determining whether an interrupt response time required for a terminal is satisfied. It is an object of the present invention to provide a method for self-diagnosis of a system interrupt response time.

[0009]

According to the present invention, in order to attain the above object, an interrupt response time required for each terminal is stored for each terminal, and the base unit transmits the interrupt response time by interrupt address polling. Calculate the response time required until an interrupt is specified, compare the interrupt response time stored in the terminal with the actual interrupt response time, and calculate the interrupt response time required for the terminal. They try to determine whether they are satisfied or not.

[0010]

In the above-described manner, at the time of starting the system, the master unit can determine whether or not the interrupt response time required for the terminal unit is satisfied. It is not to be.

[0011]

1 to 3 show an embodiment of the present invention. As shown in FIG. 2, the master unit 1 of the multiplex transmission system according to the present embodiment includes a signal processing unit 10 including a microcomputer,
A signal amplifying unit 11 for amplifying the transmission signal (logic signal) created by the signal processing unit 10 and transmitting the signal to the signal line L;
A return signal detector 12 detects a current mode return signal returned from the terminal 2 to the return signal band RSP via the signal line L. Here, the reply signal detection unit 12
Detects the interrupt pulse IP returned in the current mode at the same time as the synchronization signal SNC, converts the return signal and the interrupt pulse to logic levels, and outputs the logic level to the signal processing unit 10.

As shown in FIG. 3, the terminal 2 has a signal processing unit 20 composed of a microcomputer, a storage device 21 for storing a unique address, and a transmission signal transmitted from the master 1 via a signal line L. Transmission signal detecting section 22 for detecting
And a reply signal sending unit 23 that returns a reply signal in the current mode to the base unit 1. The transmission signal from the base unit 1 is for controlling, for example, a load connected to the terminal device 2, and when the address signal of the transmission signal matches its own address, the signal processing unit 20 gives a control output to a relay or the like. Then, the signal processing unit 20 receives the monitoring input indicating the operation of the load at that time, and returns it to the master unit 1 in the return signal band RSP.

When the terminal 2 having the above-described configuration is connected to a load, for example, a switch for lighting control,
When a switch or the like is operated, this state is changed to the signal processing unit 20.
Determines from the monitoring input, and sends an interrupt pulse IP to the base unit 1 via the reply signal sending unit 23 to cause an interrupt. At this time, the master unit 1 specifies the interrupt request terminal 2 that has issued the interrupt request by the interrupt address polling. As an example of this interrupt address polling, a plurality of terminals 2 are grouped as shown in FIG. 1 and upper several bits of the addresses of the terminals 2 belonging to each group (for example, when the address is 8 bits, When the base unit 1 performs the interrupt address polling by setting the above 4 bits) to the same value, the address signal AD
There is a method of performing so-called group access in which a plurality of terminals 2 are sequentially accessed in a group by setting an upper address of the terminal 2 in a group.

If there is an interrupt request terminal 2 in the group accessed by the group access, the master unit 1 accesses each of the terminals 2 sequentially only within the group, and makes an interrupt. The requesting terminal 2 is specified. When the group is accessed, instead of the base unit 1 accessing each terminal 2 only sequentially within the group, the interrupt request terminal 2 returns a lower address (4 bits) of its own address from the interrupt request terminal 2. The signal band RSP may be returned to the master unit 1 to specify the interrupt request terminal 2.

When the interrupt request terminal 2 is specified in this manner, as described above, the master unit 1 sets the mode signal MD of the transmission signal to the monitoring mode, and sets the address of the interrupt request terminal 2 to the monitor mode. Is set as an address signal, and a reply signal is received from the interrupt request terminal 2. Then, the base unit 1 sets the mode signal to the response mode and transmits the mode signal to the interrupt request terminal 2, and stops the transmission of the interrupt pulse IP from the interrupt request terminal 2, thereby completing the interrupt processing. .

The features of this embodiment will be described below. In the case of the present embodiment, each terminal 2 stores a unique interrupt response time individually required for itself. The interrupt response time is stored in the storage device 21.
When the system is started (including the case where the terminal 2 is added and restarted), the interruption response time is
Is registered in the master unit 1 in response to the request. The transmission of the interrupt response time at this time is performed by the master device 1 sequentially accessing the terminal device 2 cyclically and returning it to the reply signal band RSP of the transmission signal as reply data.

In this way, the base unit 1 that has registered the interrupt response time of each terminal 2 obtains the actual interrupt response time as follows. For example, a case in which the interrupt request terminal 2 is specified by the interrupt address polling shown in FIG. 1 will be described as an example. To what group each terminal 2 belongs to and at what number of terminals 2 in that group If it is known, the interrupt response time can be obtained.

Now, it takes 10 msec for one polling, and the interrupt request terminal 2 is the third
If it is the third, the interrupt response time is 3 (third group) × 10 + 3 (third terminal) × 10 + 1
0 (data read time) = 70 msec. Therefore, by comparing the actual interrupt response time obtained as described above with the registered interrupt response time, it is determined whether or not the interrupt response time required for the corresponding terminal 2 is satisfied. I do. In this case, it is preferable that master device 1 obtains the actual interrupt response time in consideration of the worst state.

If the user is not satisfied, for example, an alarm is issued to notify the user, and the installer moves the group to which the terminal 2 belongs to, for example, the group to which the interrupt address is polled first (result). The upper address of the address is changed). This can prevent the responsiveness of the system from deteriorating.

It is needless to say that the present invention can be applied to an interrupt address polling for specifying the interrupt request terminal 2 which employs another method.

[0021]

According to the present invention, as described above, the interrupt response time required for each terminal is stored, and the master specifies the terminal by the interrupt address polling and the interrupt is applied. To determine the response time required for the terminal, and compare the interrupt response time stored in the terminal with the actual interrupt response time to determine whether or not the interrupt response time required for the terminal is satisfied. Therefore, when the system is activated, it is possible to determine whether or not the parent device satisfies the interrupt response time required for the terminal device, thereby preventing the responsiveness of the system from deteriorating.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a method for obtaining an interrupt response time of a parent device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a schematic configuration of a master unit.

FIG. 3 is a block diagram illustrating a schematic configuration of a terminal.

FIG. 4 is a system configuration diagram of a multiplex transmission system.

FIG. 5 is a signal format of a transmission signal of a master unit.

FIG. 6 is an explanatory diagram of a method for a terminal to interrupt.

[Explanation of symbols]

 1 Base unit 2 Terminal L Signal line

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 12/40

Claims (1)

(57) [Claims] 1. A base unit and a plurality of terminals each having a unique address set are connected via a signal transmission medium, and the base unit specifies the address of each terminal and individually accesses each terminal. The terminal sends an interrupt request without being specified by the master unit. When the master unit receives an interrupt request from the terminal unit, it performs polling of the interrupt address and performs the interrupt request. In the multiplex transmission system that specifies the terminal that performed the interrupt, the interrupt response time required for itself is stored for each terminal, and the master identifies the terminal by interrupt address polling and the interrupt is applied. To determine the response time required, and compare the interrupt response time stored in the terminal with the actual interrupt response time to determine whether the interrupt response time required for the terminal is satisfied. Interrupt of multiplex transmission system characterized by comprising Response time self-diagnosis method.