JPH038617B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a time division multiplex transmission system.

[Background technology]

Conventionally, this type of time division multiplexing transmission system
As shown in the figure, a plurality of terminal devices 2 each having a unique address are connected to a central control device 1 via the same signal line 3, and a transmission signal with the unique address as address data is transmitted from the central control device 1. The terminal device 2 is sent and called individually, and data such as control data and monitoring data is exchanged between the central control device 1 and the called terminal device 2. Figure 2 shows an example of the transmission signal format, where P _S is a start signal, V _A is an address signal that transmits address data, V _C is a control signal that transmits control data, and V _W is a return waiting period. This is a return standby signal to be set, and the transmission signal is a pulse width modulated bipolar signal.

Now, when the terminal device 2 receives a transmission signal containing address data that matches its own unique address, it takes in the control data of the transmission signal, outputs the control output CS, controls the load, and sends it back. The monitoring data based on the monitoring input _WS is sent to the central controller 1 during the return waiting period set by the standby signal VW.
Sends a return signal RS to be sent back to. by the way,
This type of time division multiplex transmission system accesses each terminal 2 cyclically and sequentially, so as the number of terminals increases, the time required to access all the terminals 2 becomes longer, and the terminals 2 are monitored. There has been a problem in that the response after a change in the input WS is delayed, causing various practical problems. In other words, the terminal device 2 whose input changes frequently
In the same way, access terminal 2 for which the input changes very rarely, and check the monitoring input WS.
Checking the status of the terminals increases the number of unnecessary accesses, and the frequency of accessing terminals 2 that have frequent inputs decreases.For example, even if you operate a wall switch-type terminal 2, the corresponding lighting load There was a problem in that it took a long time to control and gave a strange feeling to the user.

[Purpose of the invention]

The present invention has been made in view of these problems, and its purpose is to issue an interrupt request signal from the terminal device to the central control unit when a change occurs in the monitoring input. By switching to interrupt polling mode on the side, reading the monitoring data returned from the terminal that made the interrupt request, and processing it accordingly, the time from when the monitoring input is received until the central control unit responds can be reduced. In addition to shortening the
By providing an interrupt prohibition selection means for selecting whether or not to prohibit the transmission of an interrupt request signal, interrupt requests due to non-urgent monitoring inputs can be eliminated and responses to other monitoring inputs can be made faster. It is in.

[Disclosure of the invention]

Embodiment FIG. 3 shows the format of the transmission signal sent from the central control unit 1, in which a return standby signal V _S for the interrupt request signal is provided before the start signal P _S , and a combination of the start signal P _S and the address signal V _A is provided. A mode signal V _M for specifying the normal individual polling mode or the interrupt polling mode is provided in between, and a transmission signal containing these as a set is transmitted from the central control device 1. Here, the normal individual polling mode refers to a mode in which predetermined (or all) terminal devices 2 are sequentially accessed and controlled and monitored, similar to the conventional example, and the interrupt polling mode refers to a mode in which terminal devices 2, which will be described later, are sequentially accessed and controlled. This is a mode in which the device 2 is accessed and monitored in blocks. As shown in FIG. 4, the terminal device 2 has a monitoring input change detection circuit 2a that detects changes in the monitoring input WS, and when the monitoring input change detection circuit 2a detects a change in the monitoring input WS, it outputs an interrupt signal IS. It is output to the terminal signal processing circuit 2b. The terminal signal processing circuit 2b receives the interrupt request signal via the signal line 3 while receiving the interrupt request standby signal V _S of the transmission signal.
The IRQ is sent to the central controller 1. The interrupt selection means 4 formed by a switch or the like selects whether or not to prohibit the transmission of the interrupt request signal IRQ.
When is "1", it operates in a high-speed response mode that outputs an interrupt request signal IRQ when the monitoring input changes, and when the interrupt selection signal E/D is "0", an interrupt request signal is output.
Operates in slow response mode without outputting IRQ. However, when operating in the slow response mode, a timer periodically checks for changes in the monitoring input in an individual polling mode (hereinafter referred to as timer mode). In addition, the terminal processing circuit 2b takes in the monitoring input WS and sends back the monitoring data as a standby signal.
Central control unit 1 as return signal RS while receiving V _W
or when the address data of the address signal V _A matches the set address, read the control data of the next control signal V _C and output the control signal.
It performs arithmetic control operations as a terminal device 2 that outputs CS and controls loads. Furthermore, each terminal device 2 is divided into blocks as shown in FIG. 5, and in the interrupt polling mode mentioned above, each block is accessed. For example, if the address signal V _A is 8 bits, the upper 4 If the upper 4 bits of the address data for block calling that are sent in interrupt polling mode match, each terminal in these blocks will be The terminal device 2 is called at the same time, and the terminal device 2 which is outputting the interrupt signal of the monitoring input conversion detection circuit 2a of the called terminal device 2 returns the lower 4 bits of its own address and is receiving the standby signal _VW . The data is sent to the central controller 1 at the same time. The lower 4 bits of data are sent out in the following manner. In other words, the return signal is set to 8 bits, and the logic value data of each of the lower 4 bits of the address is formed by a 2-bit code signal.For example, if the logic value is "1", a code signal of "10" is generated, and If the logical value is "0", a code signal of "01" is assigned. Therefore, the address data of the lower 4 bits of “0000” is “01” “01” “01” “01”
The 8-bit return signal RS becomes “1100”.
The address data of the lower 4 bits is “10”
This is an 8-bit return signal of "10", "01", and "01".
Here, the return signal RS is a wide pulse if the logic value is "1", and a narrow pulse if the logic value is "0", each forming a 1-bit signal, so for example, the lower 4 bits of the address If the value of a predetermined bit in the data is “1”, the corresponding return signal will be sent.
RS becomes a 2-bit signal of "10" as shown in Fig. 6a, while if the value of a given bit is "0", the corresponding return signal RS becomes "01" as shown in Fig. 6b. ” is a 2-bit signal. Therefore, when these signals are sent out simultaneously, the return signal RS corresponding to the predetermined bit sent out on the signal line 3 is
becomes “11”. This “11” code signal does not indicate the logical value “1” or “0”, so the central controller 1
By detecting this code signal, it can be determined that the return signals RS have been received from a plurality of terminals 2 at the same time. By the way, the central control unit 1 combines the returned address data of the lower 4 bits and the address data of the upper 4 bits for block calling to identify the interrupt request terminal 2 that has transmitted the interrupt request signal IRQ. An individual call mode transmission signal is sent to the interrupt request terminal 2 to cause it to return monitoring data.
However, if the return signal RS is received from multiple terminals 2 at the same time, it is not possible to identify the interrupt requesting terminal 2, so each terminal 2 in that block is called in individual polling mode and sent back the monitoring data. Check. In this case, the return number
An interrupt status ST is also returned at the same time in the RS, and if this interrupt status ST becomes "1", it indicates that the input has changed, that is, it is the interrupt request terminal 2. In this way, after the monitoring data of the interrupt request terminal 2 is returned and taken in, the central control unit 1 sends an interrupt confirmation to reset the interrupt status ST of the interrupt request terminal 2 to "0". A transmission signal of the mode (predetermined mode is transmitted using the mode signal _VM ) is sent, the interrupt operation of the terminal device 2 is canceled, and the interrupt operation is completed.

Below, the operation of the embodiment will be explained in Figures 7 and 8.
This will be explained using the flowchart shown in the figure. Now, when the operation of the central control device 1 starts, as shown in FIG.
As shown in (71), it is first checked whether the timer that sets the check timing of the terminal 2 set to the slow response mode is "1", and if the timer is "0" ( 73), it is checked whether interrupt polling mode (hereinafter referred to as IRQ mode) is enabled. On the other hand, the timer is “1”
If so, in (72), the timer flag F _T is set to "1", and the address data ATt of the terminal device 2, which checks the monitoring input in timer mode, is set, and in (73), it is checked whether it is in IRQ mode. . Here, the IRQ mode is:
“1” of the interrupt request signal IRQ is detected at (78),
This is a case where the IRQ mode is set in (79) and the address AHi of the terminal 2 block to be checked in the IRQ mode is set. By the way, at the start, F _T is "0" and IRQ is "0", so (752) is set to individual polling mode (hereinafter MZP
The transmission signal (referred to as mode) is cyclically transmitted to each terminal 2 in sequence, and the return signal RS from each terminal 2 is received at (753), and further (78)
Check whether IRQ is “1”. if
If IRQ is “1”, IRQ mode is set,
In the next routine, the process moves to (741) to send out an IRQ mode transmission signal, and at the same time receives the return signal RS from the terminal device 2 (751), and moves to the polling processing subroutine SUB (761). Note that in this case, IRQ = 1 has higher priority than F _T = 1, so
Even if F _T is "1", IRQ mode operation is performed preferentially. Next, when F _T is "1" and the IRQ mode operation is completed or IRQ is "0", the timer mode transmission signal is sent to the terminal device 2 in the slow response mode at (753). The return signal RS is received at (764), and the polling processing subroutine SUB is executed at (774). Note that in the embodiment, the timer mode operation is substantially the same as the IRQ mode operation. Figure 7b shows the polling processing subroutine
This is a flowchart of SUB. In (S1), it is checked whether the previously sent transmission signal is in the block polling mode that calls the terminal device 2 for each block,
In the case of block polling mode, the return signal RS is checked in (S31), and if there is no response, the terminal device 2 that issued the IRQ in the polled block
It is determined that there is no address, and the address AH is set to 1 in (S33).
It also checks whether it is in timer mode (S36), and if it is not in timer mode,
RET. On the other hand, if there is a reply (S32)
Checks whether there is any duplication of the return signal RS, and if there is no duplication, the terminal device 2 identified based on the lower 4 bits of the address data returned in (S35)
Set the address data (8 bits) of the MZP mode transmission signal for directly calling and return (RET). In addition, if the return signals RS are duplicated, the address data AL of the lower 4 bits of the MZP mode transmission signal that individually calls the terminal devices 2 in the block is set to "0" in (S34), and the return signal is returned (S34). RET). Here (S34) (S35)
The address data set in (S33) is used in (741), (752), and (753). Next (S21)
If it is MZP mode, the presence or absence of a reply is checked in (S22), and then in (S24) it is checked whether the interrupt status ST is "1", that is, the interrupt request terminal is checked. It is checked whether the response is from device 2, and if ST is "1", the returned monitoring data is processed as a change in the monitoring input in (S25), and if it is in IRQ mode, the IRQ mode is set in (S27). Cancel and return (RET). If it is timer mode, set the mode to polling mode (S28),
In the next routine (S36) and (S37), check whether access to the terminal device 2 to be monitored in timer mode has been completed. If it has been completed, set the timer flag F _T to "0" in (S38) and return ( RET).

FIG. 8 is a flowchart showing the operation of the terminal 2. When a transmission signal is received at (81), it is first checked at (82) whether or not it is in the normal MZP mode based on the mode signal _VM . When the address is checked in MZP mode (831) and an address match is obtained, (832) ~
(834) checks whether the interrupt flag is "1" and sets the interrupt status ST.
At (835), a return signal RS consisting of monitoring data and interrupt status ST is sent. Subsequently, in (836), a control output for load control is formed based on the control data of the transmission signal. Then, if you are not in MZP mode,
At (84), it is checked whether the interrupt confirmation mode (hereinafter referred to as ACK mode) or IRQ mode is selected, and in the case of ACK mode, an address check is performed at (852), and if an address match is obtained, an interrupt is issued at (862). The flag is reset to "0" and the interrupt operation is completed. On the other hand, in the case of IRQ mode, the upper addresses are compared at (851), and when a match is obtained, the interrupt flag is checked at (861) to see if it is "1", and if it is "1" ( 862) return signal RS
The lower-order data (4 bits) of the address is sent as . Next, in (871), it is checked whether the interrupt selection signal E/D is "1", and if it is "1", the monitoring input is detected in (872), and (873)
Check if there is a change in the monitored input with
If there is a change, the interrupt flag is set to "1" (874). When the interrupt flag is set to "1" in this way, the interrupt request signal return waiting period is checked in steps (875) and (876), and the interrupt request signal IRQ is sent out at a predetermined timing. By the way, if the interrupt selection signal E/D is "0", the processes (871) to (876) are not performed, and the interrupt request signal IRQ is not generated even if the monitoring input changes. Therefore, by setting the interrupt selection signal E/D of the monitoring terminal 2 to "0", which does not require a slow response, interrupt requests due to changes in the monitoring input that do not require an emergency can be avoided. Therefore, it is possible to respond more quickly to changes in the monitoring input of other terminals for high-speed response whose interrupt selection signal E/D is "1".

〔Effect of the invention〕

As described above, the present invention connects a large number of terminal devices to a central control unit via signal lines, and sends a return standby signal that sets address data for individual calling, control data, and a return standby period for individually calling the terminal devices. Individual polling mode in which control data is transmitted to the called terminal by sequential cyclic transmission from the central control device, and monitoring data is sent back from the called terminal to the central control device during the return waiting period, and monitoring input from the terminal. When an interrupt request signal transmitted at the time of a change in the interrupt request signal is received, the block calling address data and a return standby signal are transmitted from the central control unit to call the terminal group block by block. An interrupt selection mode in which it is possible to freely switch between an interrupt polling mode in which the interrupt request signal is sent back, and an interrupt polling mode in which the interrupt request terminal device is called individually to return the monitoring data, and it is possible to select whether or not to prohibit the transmission of an interrupt request signal to the terminal device. In addition to providing a means to do so, the central control unit calls terminal devices that are prohibited from issuing interrupt request signals in individual polling mode as needed to return monitoring data, and when a change occurs in the monitoring input, the corresponding The terminal device sends an interrupt request signal to the central control device, and the central control device enters interrupt polling mode, reads the monitoring data returned from the terminal device that made the interrupt request, and processes it accordingly. Therefore, the time from when a monitoring input is received until the central control unit responds can be shortened, and an interrupt prohibition selection means for selecting whether or not to prohibit the transmission of an interrupt request signal is provided. Therefore, there is an advantage that interrupt requests due to non-urgent monitoring inputs can be eliminated and responses to other monitoring inputs can be made faster.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a time division multiplexing remote control system, FIG. 2 is an explanatory diagram of the format of the transmission signal same as above, FIG. 3 is an explanatory diagram of the format of the transmission signal according to an embodiment of the present invention, and FIG. 4 5 is a schematic block diagram of the same terminal as above, FIG. 5 is a schematic configuration diagram for explaining the blocking used in the above, FIGS. Figures a, b
8 is a flowchart of the central control device as described above, and FIG. 8 is a flowchart of the terminal device as described above, where 1 is the central control device, 2 is the terminal device, 3 is a signal line, and 4 is an interrupt selection means.

Claims (1)

[Claims] 1. A large number of terminal devices are connected to the central control device via signal lines, and the central control device sequentially sends address data for individual calling, control data, and a return standby signal that sets the return standby period to call the terminal devices individually. There is an individual polling mode in which control data is transmitted to the called terminal and monitoring data is sent back from the called terminal to the central control unit during the return waiting period, and an individual polling mode is sent from the terminal when the monitoring input changes. When an interrupt request signal is received, block calling address data and a return standby signal are transmitted from the central control unit to call a group of terminal devices block by block. It is possible to freely switch between an interrupt polling mode in which each requesting terminal device is called individually and the monitoring data is sent back, and an interrupt selection means is provided to select whether or not to prohibit the terminal device from transmitting an interrupt request signal. A time division multiplex transmission system in which a control device calls terminal devices that are prohibited from issuing interrupt request signals in an individual polling mode as appropriate and causes them to return monitoring data.