JPH04123692A - Interruption processing system for time division multiplex transmission system - Google Patents

Abstract

PURPOSE:To easily cope with the increase/decrease of the number of groups by varying the pulse width of a start pulse corresponding to an occupied time zone for an interruption request signal varying corresponding to the number of groups. CONSTITUTION:When a central control unit 1 receives an interruption request, it forms a high-order bit for group access used for performing access to a prescribed number of terminal equipment 2 in the lump by changing bits other than the part of the above-mentioned high-order bit in order. It sets four time zones for returning an interruption request signal Vi within the start pulse ST of a dummy transmission signal Vs and specifies the high-order 2 bits of a specific address depending on which of the time zones (a) to (c) within the start pulse ST the interruption request signal Vi is returned to. When the number of groups is increased, the pulse width of the start pulse ST is widened. Thus, a useless signal zone can be eliminated from the pulse width of the start pulse ST and a processing speed can be raised.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a time division multiplex transmission system that transmits signals by time division multiplexing between a base unit and a plurality of terminal devices via a signal transmission medium. This is related to the processing method.

[Prior Art] A remote monitoring and control system is a time division multiplex transmission system that transmits signals by time division multiplexing between a base unit and a plurality of terminals via a signal transmission medium.

This remote monitoring and control system is used in lighting control systems, security systems, and the like. In this remote monitoring and control system, as shown in FIG. A plurality of control terminals 3 for controlling are connected via a pair of signal lines 4, and a transmission signal Vs shown in FIG. 4(a) is transmitted from the central control unit 1 via the signal line 4. Note that each of the terminals 2 and 3 has a unique address set therein. The transmission signal Vs includes a start pulse ST indicating the start of signal transmission, mode data MD indicating the data transmission mode, a terminal device 2 to be accessed,
address data AD indicating address 3 (8 bits);
It consists of control data CD indicating the control contents of the loads L1 to L4, error detection data C8 such as checksum data, and a reply standby signal WT that sets a reply period for monitoring data from the terminal device 2.3, as shown in FIG. The signal is time-division multiplexed and transmitted using a pulse width modulated bipolar (±24 cm) signal shown in (b).

In addition, each terminal device 2.3 operates by rectifying and smoothing the transmission signal Vs transmitted via the signal line 4 from the central control device 1 to create a power supply. When the address data and the own unique address data match, the control data of the transmission signal Vs is taken in, and the monitoring data (operation status monitoring information of the operation switches S1 to S4 ,
Loading, ~L.

operation status information, etc.) as a current mode signal (with signal lines 4 in a substantially short-circuited state) 3! believe in

FIG. 6 is a block circuit diagram showing a schematic configuration of the central control bag W1, which includes a signal processing section 10 consisting of a microcomputer that performs signal processing such as sending the transmission signal VS and receiving the reply signal VS, The signal amplifier 11 amplifies (±24 V) and transmits the amplified signal to the signal line 4, and the current mode reply signal ■ returned from the terminal device 2.3 via the signal line 4.
, and a reply signal detection section 12 that detects.

FIG. 7 is a block circuit diagram showing a schematic configuration of the terminal device 2.3, which includes a signal processing unit 20 consisting of a microcomputer that performs signal processing such as receiving a transmission signal Vs and transmitting a reply signal V, and each terminal. an address setting section 21 that sets a unique address of the device 2.3; a transmission signal detection section 22 that detects a transmission signal Vs transmitted via the signal line 4; and a reply signal that sends out a current mode reply signal V. It is composed of a sending section 23.

By the way, the central control bag W1 includes operation switches 81 to S.
, is operated, an interrupt processing means is provided which detects the operating state by interrupt processing, and constantly transmits a dummy transmission signal Vs with the mode data MD in a dummy mode. The operating switch S1''S4 of the monitoring terminal 2 is operated, and an interrupt request signal Vi as shown in FIG. 5(b) is transmitted from the terminal 2 in synchronization with the start pulse ST of the transmission signal Vs. When this occurs, the interrupt request terminal 2 is searched and identified, the identified interrupt request terminal 2 is accessed using the transmission signal VS in the individual access mode, and the monitoring data is sent back using the transmission signal VS in the current mode. .

Here, when specifying the interrupt requesting terminal 2, first, the central control unit 1 transmits the upper bits of the address data and performs an interrupt address polling in which a predetermined number of multiple terminals 2 are group accessed at once. mode (hereinafter this mode is referred to as search mode) transmits a transmission signal Vs,
Access the terminal device 2 block by block and request an interrupt from the terminal device 2
The lower bits of the address data are sent back from the interrupt request terminal 2, and the upper bits and lower bits are combined.
, and transmits a transmission signal Vs in the individual access mode from the central control bag W11, and individually accesses the identified interrupt request terminal 2 to return the monitoring data.

Note that when the monitoring data is received by the central control device 1,
The central control device 1 transmits the response mode transmission signal 3 to the interrupt request terminal 2, stops the transmission of the interrupt request signal Vi, and ends the interrupt processing.

In addition, in the central control device 1, the operation switch 8 sent back from the monitoring terminal device 2 to the central control device 1 as described above.
The corresponding load based on the operation state information of 1 to S,
At the same time as creating control data to be transmitted to the control terminal device 3 that controls L4, the control data is time-division multiplexed and transmitted to the control terminal device 3 via the signal line 4 to transmit the loads L1 to L4.
, and transmits control data for controlling the blinking of the operation indicator lamp of the monitoring terminal 2 based on the operation state information of the loads L1 to L.

However, in the interrupt processing method of the conventional remote monitoring and control system described above, the transmission signal Vs in which the address data for group access formed by sequentially changing the upper bits is transmitted, and all the terminals 2 are connected to each group. Since the lower address is returned from the interrupt request terminal 2 by sequentially accessing the In this case, it takes time to specify the interrupt request terminal 2, and the operation switch S
There was a problem in that the response time from when S4 was operated until the corresponding load, ~L, was controlled was long.

Therefore, in Japanese Patent Application No. 2-65010, terminal device 2,
3, an interrupt request signal Vi specifying at least some of the upper bits of the unique address is sent back to the central controller 1 in synchronization with the start pulse to issue an interrupt request. At the stage when an interrupt request is received from 2.3, the groups to which the terminal device 2.3 that made the interrupt request may belong are narrowed down to several groups, and the interrupt requesting terminal device 2.
This eliminates the need for the central control unit W1 to access all groups in order to specify the interrupt request terminal 2.3, thereby making it possible to quickly specify the interrupt request terminal 2.3 and shortening the response time. . In other words, the central control unit 1 that has received at least some of the upper bits performs group access to several groups of terminal devices 2.3 corresponding to the upper bits that can be identified from the bit data, and the terminal that has made the interrupt request. When accessing a group that includes the interrupt request terminal 2-3, the interrupt request terminals 2 and 3 send back the lower bits of the unique address to the central control unit 1, and receive the lower bits from the interrupt request terminal 2-3. The central control unit 1 specifies the interrupt requesting terminal 2.3 based on the lower bit and the upper bit for group access. Here, as a method of specifying at least some of the upper bits of the unique address of the terminal device 2.3 in the above-mentioned interrupt processing method, a method is provided in which the occupied time period of the interrupt request signal Vi within the start pulse is varied. For example, at least some of the upper bits were specified based on the number of pulses and pulse width of a current mode pulse signal sent back in synchronization with the start pulse.

[Problems to be Solved by the Invention] However, with the above-mentioned method of varying the number of pulses and pulse width of the interrupt request signal Vi, when the number of groups in which at least some of the upper bits are common increases, the start There was a possibility that the interrupt request signal Vi specifying all groups could not be superimposed within the pulse width of the pulse. Therefore, it is conceivable to add some margin to the pulse width of the start pulse in anticipation of a certain increase in the number of groups, but if the number of groups is small, the problem arises that the pulse width of the start pulse becomes unnecessarily wide. .

The present invention has been made in view of the above points, and its purpose is to provide time division multiplex transmission that can easily accommodate an increase or decrease in the number of groups in which at least some of the upper bits are common. The objective is to provide a system interrupt processing method.

[Means for Solving the Problems] In order to achieve the above object, the present invention allows the pulse width of the start pulse to be adjusted as appropriate depending on the time period occupied by the interrupt request signal.

[Function] By having the above-described configuration, the present invention makes it possible to vary the pulse width of the start pulse according to the occupied time period of the interrupt request signal, which varies according to the number of groups, thereby eliminating waste. The pulse width of the start pulse becomes wider,
This is to prevent the system from being unable to cope with an increase in the number of groups.

[Example] An embodiment of the present invention is shown in FIGS. 1 and 2.

Before explaining this embodiment, let us explain the conventional terminal device 2.3.
A specific example of a method for specifying at least some of the upper bits of the unique address will be described below.

In the conventional remote monitoring and control system, for example, when an interrupt request is made from the terminal device 2, the terminal device 2 sends a signal specifying a part (2 bits) of the upper bits (4 bits) of the unique address to the dummy transmission signal Vs. The central control unit 1 sends an interrupt request by replying to the central control bag W1 in synchronization with the start pulse ST. Upon receiving this interrupt request, the central control unit 1 accesses a predetermined number (16) of terminal devices 2 at once. The upper bits (4 bits) for group access for
A search mode transmission signal V is formed by sequentially changing bits other than the 2 bits b+, bz) shown in FIG. 8, and uses the upper bits for group access as address data.
s is transmitted to perform group access, the lower address (4 bits) of the address data is returned from the interrupt request terminal 2, and the upper and lower bits are combined to identify the interrupt request terminal 2 (8 bits). Then, the specified interrupt request terminal 2 is accessed by the transmission signal Vs of the individual access mode transmitted from the central control bag W1, and the monitoring data is sent back.

Here, a description will be given of how a part of the upper bits (b+, b2) of the unique address is specified using the interrupt request signal Vi in the conventional interrupt processing method described above. Here, a case will be explained in which each terminal device 2 having the same upper two bits of its unique address is divided into four groups A to D. In other words, in this case, the interrupt request signal Vi is a dummy transmission signal V that is returned as a current mode pulse signal.
Set four time periods in which the interrupt request signal Vi is returned within the start pulse ST of s (indicated by a%e in Fig. 9), and interrupt in any time period a''-C within the start pulse ST. The top two unique addresses depending on whether the request signal Vi is returned
Identify the bit. Note that time periods a"-c correspond one-to-one to groups A-D, respectively. Now, for example, if the terminal device 2 returns an interrupt request signal Vi in time period C, the interrupt This indicates that the request was made from terminal 2 of group C.

In this way, when an interrupt request is received from the terminal device 2 in the central control bag W1, the groups to which the terminal device 2 that made the interrupt request may belong can be narrowed down to several groups. There is no need to access all groups, and one interrupt requesting terminal 2 can be quickly identified, and the corresponding load, ~L, can be determined after the operation switch S, ~S, is operated.

The response time until it is controlled can be shortened.

That is, in the worst case, the interrupt requesting terminal 2 can be identified by accessing 64 groups.

By the way, there is no problem when the number of groups is small as described above, but when the number of groups increases and the number of pulse signals forming the interrupt request signal vi that specifies the two upper bits increases, As shown in FIG. 13, the interrupt request signal Vi cannot be superimposed on the start pulse ST, and the system cannot be expanded.

Therefore, in the fifth embodiment, as shown in FIG. 1, when the number of groups increases as described above, the pulse width of the start pulse ST can be widened accordingly.

On the other hand, as shown in FIG. 14, when the number of groups is small, the pulse width of the start pulse ST becomes unnecessarily wide, so in this case, as shown in FIG.
This allows the pulse width of T to be narrowed. In this way, when the number of groups is small, it is expected that the pulse width of the start pulse ST will eliminate unnecessary signal bands and increase the processing speed, and it will also be possible to obtain expandability to accommodate a large number of groups. becomes possible.

The present embodiment can also be applied to a method in which a part of the upper bits (b+, bz) of a unique address is specified using the interrupt request signal Vi as described below. As shown in FIG.
+, bl), and as shown in Fig. 11, the interrupt request signal Vi is composed of two pulse signals, and the pulse intervals of the two pulse signals indicate groups A-D. or a combination of FIGS. 9 and 10, which sets two time periods for returning the interrupt request signal Vf of the start pulse ST as shown in FIG. For example, the pulse width of the returned pulse signal is of two types, and four groups A to D are specified by a combination of the response time period and the pulse width. Note that it is also possible to indicate the number of pulses of the interrupt request signal Vi, and it goes without saying that it is also possible to use a combination of any two of the three individual methods described above, or a combination of all of them. Basically, the terminal device 2.
As long as the method for specifying at least some of the upper bits of the unique address in step 3 is a method in which the time period occupied by the interrupt request signal Vi within the start pulse ST is varied, this applies to all methods. Can apply the invention.

[Effects of the Invention] As described above, the present invention allows the pulse width of the start pulse to be adjusted as appropriate depending on the time period occupied by the interrupt request signal. The pulse width of the start pulse can be varied according to the occupied time period, and when the number of groups is small, it is expected that the processing speed will be increased by eliminating unnecessary signal bands from the pulse width of the start pulse. This has the advantage of being scalable to accommodate a large number of groups.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams showing a method of varying the pulse width of a start pulse according to the number of groups according to an embodiment of the present invention, and FIG. 3 is a schematic system configuration diagram of a remote monitoring and control system. Fig. 4 is an explanatory diagram of the transmission signal same as above, Fig. 5 is an explanatory diagram of the interrupt request method as above, Fig. 6 is a block diagram showing the schematic circuit configuration of the central control unit, and Fig. 7 is a schematic diagram of the terminal device. A block diagram showing the configuration, FIGS. 8 and 9 are explanatory diagrams of a method for specifying some bits using an interrupt request signal, and FIGS. 10 to 12 are illustrations of specifying some bits using other interrupt request signals, respectively. 13 and 14 are explanatory diagrams of the method and the problems of the conventional interrupt processing method. 1 is the central control unit, 2.3 is the terminal device, 4 is the signal line, VS
is a transmission signal, ■ is a reply signal, Vi is an interrupt request signal, S
T is a start pulse, AD is address data, and CD is control data. Agent Patent Attorney Ishi 1) Chief 7 1 Figure 2 Figure t Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 i Figure 12

Claims (1)

[Claims] (1) Consisting of a base device and multiple terminal devices each with a unique address set, a start pulse indicating the start of signal transmission;
Sending a transmission signal from the base device to each terminal device, which includes at least address data indicating an address for specifying the terminal device to be accessed, and data indicating signal content;
In a time division multiplex transmission system in which signals are transmitted by time division multiplexing between a parent device and a terminal device, an interrupt request signal that specifies at least some of the upper bits of a unique address is sent from the terminal device in synchronization with a start pulse. The parent device sends an interrupt request in response to the base device, and the base device, which receives at least some of the above-mentioned upper bits, performs group access to access multiple terminal devices at once using the upper bits based on the bit data. , when accessing the group that includes the terminal that made the interrupt request, the interrupt requesting terminal returns the lower bits of its unique address to the base unit, and the base unit that receives the lower bits from the interrupt requesting terminal identifies the interrupt requesting terminal based on this lower bit and the above-mentioned upper bit for group access, and the base unit individually accesses the identified interrupt requesting terminal and connects the interrupt requesting terminal and the base unit. As a method for transmitting a signal between and specifying at least some of the upper bits of the unique address of the terminal device, a method is adopted in which the time period occupied by the interrupt request signal within the start pulse is varied, and An interrupt processing method for a time division multiplex transmission system, characterized in that the pulse width of a start pulse can be adjusted as appropriate depending on the time period occupied by the interrupt request signal.