JPH0715419A - Equipment control device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention aims to reduce the load at the time of transmission / reception of a device serving as a master station, guarantee the accuracy of a long time of 1 second or more of a device serving as a slave station, and share a reference time. The present invention is intended to provide a control device for a device, which comprises a device 15 as a master station and a device 16 as a slave station. The device 15 includes a synchronization signal generating means 19, a transmitting means 20, a receiving means 21, and a control. Means 22 and control means 22
And a time measuring means 23 for counting the time limit in the device serving as the main station by receiving a reference signal from the device. Equipment 16
Is a receiving means 24 for receiving a data transmission message transmitted from a device serving as a main station, a transmitting means 25, and a control means 26.
And a clocking means 27 which receives a reference signal from this control means and counts the time limit in the device which is the slave station. Then, the device 15 always keeps transmitting the data transmission message that allows the device 16 to create a signal serving as the reference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for controlling polling / selecting transmission between a plurality of devices.

[0002]

2. Description of the Related Art Conventionally, when two devices are connected by a transmission communication path and a large amount of data are communicated with each other, a synchronous control method is used as a synchronous control method, and one device is used as a line control method. In many cases, a system using polling / selecting in which the master station and the other device are slave stations is used. In the case of this polling / selecting method, since the transmission is being performed or the reception is being performed, the communication algorithm is easy. That is, first, the master station sends a message to the slave station and requests a response from the slave station. At this time, the master station is transmitting and the slave station is receiving. Next, the slave station sends a message such as the status to the master station. At this time, the slave station is transmitting and the master station is receiving. In this way, transmission and reception are completely distinguished.

FIG. 3 shows an example of a conventional synchronous communication system. In this conventional example, the device 1 serving as the main station
One-to-one synchronous data transmission is performed between (hereinafter simply referred to as a device) and a slave device 2 (hereinafter simply referred to as a device). The transmission communication path 3 uses a 4-wire type. The device 1 includes a transmitting means 4 and a receiving means 5.
It has a clock source 6, a control means 7, and a clock means 8. The device 2 serving as a slave station includes a receiving unit 9, a transmitting unit 10, a clock input unit 11, and a clock source 12.
The control means 13 and the clock means 14 are provided, and each clock means counts the signal from each clock source. In the device 2, the clock input means 11 receives the transmission / reception synchronizing signal sent from the device 1.

Further, as a reference for the time limit used by the clock source of each device, an oscillator using a ceramic oscillator or the like is used.

[0005]

However, in the above configuration, a common clock for synchronization is supplied,
It is necessary to send and receive the bits accordingly. Therefore, as the transmission communication line 3, one extra line for the synchronous clock must be used.

A start-stop synchronization method can be considered as a method that does not use a synchronization clock. However, in this case, the stability of synchronization cannot be maintained for a long time with respect to one start bit. Therefore, when sending a large amount of data (transmission message), start / start in 1-byte units.
Stop bits must be added and the receiver must keep an eye on the start bit.

Although a method of synthesizing data and a clock and transmitting them through the same transmission line and decomposing them into data and a clock on the receiving side is also used (Ethernet preamble part, Manchester code, etc.), in this case the clock is used. The load on the device on the receiving side is increased by the amount of the procedure for extracting the components.

When an oscillator using a ceramic oscillator or the like is used, it is technically difficult to guarantee the accuracy of a long time of 1 second or more for all the devices and share the reference time. As a means for solving this, a method in which a signal synchronized with the zero voltage of a commercial power source is used as a time reference is often used, but in addition to one signal line for transmitting this synchronizing signal, it is necessary. However, if it is attempted to be performed in parallel with the processing of transmission control, there is a drawback that the load on the program becomes large because the signal transmitted / received and the signal synchronized with zero voltage are asynchronous.

The present invention is intended to solve the problems of such a conventional configuration, and reduces the load of the master station device at the time of transmission / reception, and at least one second of the slave station device. It is a first object of the present invention to provide a control device for equipment in which a master station and a slave station have a one-to-one relationship in which the accuracy of a long time can be guaranteed and the reference time can be shared. Further, in relation to the first object, a second object is to provide a control device for a device in which the relationship between the master station and the slave station is 1: N.

[0010]

The first means of the present invention for achieving the first object is an apparatus serving as a main station in a transmission communication path for performing data transmission in a one-to-one asynchronous start-stop synchronization method. And a device serving as a slave station are connected, and the device serving as the master station is transmitted from the slave station by a synchronization signal generating means for generating a signal synchronized with the zero voltage of the commercial power source, a transmitting means for transmitting a data transmission message, and a slave station. A receiving means for receiving a data transmission message, a data transmission message to be transmitted to the transmitting means, a received data transmission message from the receiving means, a signal from the synchronization signal generating means, and the transmitting means;
The control unit controls the receiving unit, and the clock unit that receives a reference signal from the control unit and counts the time limit in the device serving as the master station, and the device serving as the slave station is the device serving as the master station. Receiving means for receiving the data transmission telegram transmitted from the transmitting means, transmitting means for transmitting the data transmission telegram, and giving the data transmission telegram to the transmitting means and receiving the received data transmission telegram from the receiving means. And a clock means for receiving a reference signal from the control means and counting the time limit in the device which becomes the slave station, and the device which becomes the master station is always the device which becomes the slave station. The device is a control device of a device that continuously transmits a data transmission message that can generate a signal that becomes

A second means of the present invention for attaining the second object is a device as a master station and a plurality of slave stations connected to a transmission communication path for performing data transmission in a 1: N asynchronous start-stop synchronization method. The device is used as a control device for the connected device.

[0012]

The first means of the present invention operates as follows.
The main station equipment counts the signal synchronized with the zero voltage of the commercial power source generated by the synchronization signal generation means as a reference for each time period in the equipment, and in accordance with this synchronization signal, the data including the synchronization signal component The transmission message is constantly transmitted. The slave station device receives the data transmission message transmitted from the master station device, and simply creates a signal in accordance with the above synchronization signal from the received data transmission message, and the device for which the timekeeping means is the slave station. It serves to count this signal as a reference for each time period within.

The second means of the present invention is that a device serving as a master station connected to a transmission communication path of 1: N sends a data transmission message containing the synchronization signal to a plurality of devices serving as slave stations. Each of the time-measuring means of the device that serves as a slave station operates so as to count this signal as a reference for each time period in each device.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the figure, 15 is a device serving as a master station (hereinafter simply referred to as a master station), 16 and 17 are devices serving as a first slave station and devices serving as a second slave station (hereinafter simply referred to as a first device and a first device, respectively). Second device), each of which is connected to a 3-wire type transmission communication line 18 for performing data transmission in a one-to-two asynchronous asynchronous manner.

The main station 15 has the following means. 1
Reference numeral 9 is a synchronizing signal generating means for generating a signal synchronized with the zero voltage of the commercial power source. Reference numeral 20 is a transmission means for transmitting a data transmission message. Reference numeral 21 is a receiving means for receiving the signal received from the transmission communication path 18. Reference numeral 22 is a control means for giving a data transmission message to the transmitting means 20 and receiving the received data transmission message from the receiving means 21 to control the transmitting means 20 and the receiving means 21. Further, reference numeral 23 is a clocking means for receiving a signal of the synchronizing signal generating means 19 and receiving a signal as a clocking reference created by the control means 22 to count the time limit in the main station 15.

The first device 16 and the second device 17 respectively have the following means. Reference numeral 24 is a receiving means for receiving the data transmission message on the transmission communication path 18 transmitted by the transmitting means 20 constituting the main station 15. Reference numeral 25 is a transmission means for transmitting a data transmission message. Reference numeral 26 gives a data transmission message to the transmission means 25 and receives the received data transmission message from the reception means 24 and the transmission means 2
5 is a control means for controlling 5. Further, 27 is a time counting means for receiving the time reference signal generated by the control means 26 and counting the time limit in the first device or the second device.

The operation of this embodiment will be described below with reference to FIG. Since the first device 16 and the second device 17 operate in the same manner, only the first device 16 will be described here. In FIG. 2, (1) is a sync signal waveform synchronized with the zero voltage of the commercial power source generated by the sync signal generating means 19, and (2) is a main station transmission waveform, which is a data transmission message. (3) is a master station reception waveform received by the master station 4, (4) is a slave station reception waveform received by the first device 16, and (5) is a slave station transmission waveform transmitted by the first device 16. ) Is a reference signal generated by the control means 26 of the first device 16,
(7) shows an enlarged waveform of the transmission / reception data. In this embodiment, the data transmission message is 4 bytes, the acknowledgment message (hereinafter referred to as ACK) is 1 byte, and the idle time with no transmission / reception signal waveform is 1 byte.

The transmission from the main station 15 to the first device 16 is performed as follows. When the control means 22 constituting the main station 15 detects the rising edge of the waveform of the signal synchronized with the zero voltage shown in (1) from the synchronization signal generation means 19,
After the elapse of a predetermined delay time, the transmission means 20 is instructed to output the first byte of the signal forming the transmission data. Receiving this signal, the transmitting means 20 adds a start bit and a stop bit as shown in (7) and outputs a signal forming this transmission data. The transmitting means 20 outputs the signals up to the fourth byte in response to the instruction from the control means 22 in the same procedure. The fifth byte is the control means 22.
When it detects the rising edge of the synchronization signal waveform (1), it instructs the transmitting means 20 to output a fixed value (X'00011111 ') without providing a delay time, and instructs the receiving means 21 to receive an ACK 1 byte. When the receiving means 21 receives the ACK signal sent from the slave station, the control means 22 recognizes that the data is normally received. The sixth byte is a waiting period, which is waiting without giving an output instruction in order to make a vacant time for transmission and reception. Thus, the transmission is completed as shown by the waveform (2). In (1), the transmission mode is shown after t1, the reception mode is shown after t2, and the transmission mode is shown after t3.

The receiving means 24 of the first device 16 which is a slave station starts receiving the data transmitted by the transmitting means 20. That is, as shown in the waveform (4), when the falling edge of the start bit is detected, the start-stop synchronization receiving procedure is started and one byte of data is transmitted to the control means 26. The control means 26 receives this data and, if the address information contained in this data is that of its own station, instructs the reception means 24 to receive signals up to the fourth byte in the same procedure. When the receiving means 24 transmits the signal of the fourth byte to the control means 26, the control means 26 checks the presence or absence of the reception error by the checksum. When it is confirmed that the received data is normal, the transmission means 25 is instructed to transmit an ACK after a predetermined delay time has elapsed from the fall of the start bit in the fifth byte. Receiving this instruction, the transmitting means 25 transmits ACK as shown in the waveform (5). The control means 26 completes the reception after confirming that there is a vacant time equivalent to 1 byte after the transmission means 25 transmits this ACK. When the address information is different from that of the own station, the detection of the trailing edge of the start bit up to the fifth byte and the confirmation that there is a vacant time corresponding to 1 byte are only performed.

Next, the transmission operation from the first device 16 to the main station 15 will be described. When the control means 22 of the main station 15 detects the rising edge of the sync signal waveform generated by the sync signal generating means 19 shown in the waveform (1), it immediately outputs the fixed value (X '
00011111 ') output to the transmission means 20, and
The receiving means 21 is instructed to receive the first byte. When the receiving means 21 detects the trailing edge of the start bit shown in the waveform (3) sent from the transmitting means 25, the receiving means 21 starts an asynchronous reception procedure and transmits 1-byte data to the control means 22. . When the transmission of the signal for 4 bytes is completed by the same procedure, the control means 22 checks the presence or absence of the reception error by the checksum. If the received data is normal, after a predetermined delay time has elapsed from the rise of the waveform (1), the transmitting means 20 is instructed to output 1 byte of ACK, and the transmitting means 20 transmits ACK. After this ACK is transmitted, it waits without giving an output instruction in order to make a free time for transmission and reception, and the reception is completed.

When the first device 16 receives the address information of its own station in the above reception state, the control means 26 controls the data after the lapse of a predetermined delay time from the fall of the start bit of the waveform (4). It instructs the transmitting means 25 to output the first byte. The transmitting means 25 adds start bits and stop bits to this data and outputs it. The data up to the 4th byte is output in the same procedure. At the fifth byte, the control means 26 instructs the receiving means 24 to receive the ACK1 byte. The receiving means 24 receives the ACK sent from the main station 15 based on this instruction. The control unit 26 confirms that there is a vacant time corresponding to 1 byte after receiving the ACK, and recognizes that the data is normally received. This completes the transmission. When the address information of the local station is not received in the receiving state, only the start bit falling is detected up to the 5th byte and it is confirmed that there is a vacant time equivalent to 1 byte.

After that, the main station 15 alternately repeats the transmission state and the reception state described above, and always continuously transmits data or a fixed value (X'00011111 ') to the device 16.

Next, the timing operation will be described. Main station 15
The time measuring means 23 receives the signal A (equivalent to the waveform (1) in FIG. 2) based on the synchronizing signal from the control means 22.
The signal A causes the time measuring means 23 to count the time limit in the main station 15. On the other hand, the clocking means 27 of the first device 16 receives the signal B (6) received from the control means 26. This signal B is created by the control means 26 in accordance with the fall of the start bit of the data transmitted by the transmission means 20 of the main station 15. The clock means 27 is
The time limit in the first device 16 is counted based on this signal B. In this case, in this embodiment, a vacant period corresponding to 1 byte is provided, and 1 is added every time transmission and reception are completed in order to correct the count value due to the missing pulse of the signal B in this period. There is something.

As described above, according to the present embodiment, the time counting means 27 counts the signal B as a reference for each time period in the first device 16, so that a very accurate time measurement is possible even for a long time of 1 second or more. Is something that can be done. Further, the reference time can be shared between the first device 16 and the second device 17. Further, the main station 15 can set the transmission start from the first device 16 at the time of reception by a pulse transmitted by the transmission means 20 at a timing convenient for the processing of the own station. In other words, this means that the processing of start bit detection in reception can be performed very easily without using a complicated means such as an external interrupt that easily causes timing problems.

Furthermore, the present embodiment can be used to connect the electronic control circuit units in the equipment to each other. For example, when the operation display unit and the load of the motor are separated from each other like the control circuit of a washing machine, the load control unit (main station)
If you do not want to interrupt an external terminal near the zero voltage of the commercial power supply voltage due to processing such as TRIAC pulse ignition, etc., or you need time to complete the clock / timer function on the operation display unit (subordinate station). This is especially useful when it is desired to accurately measure time. Further, in order to perform the above processing, it is possible to easily add the transmission control function while using the existing program created to synchronize with the signal synchronized with the zero voltage of the commercial power supply voltage as it is. ,
In such a case, the communication system can be easily adopted.

In this embodiment, the data is 4 bytes, but other values may be used. Also fixed value
Although X'00011111 'is used, it is obvious that any value other than this value may be used as long as the pulse has a width that can be detected by the receiving unit of the slave station. Further, the transmission communication path 28 employs a 3-wire system, which is one less than the synchronous 4-wire system, but the pulse width is set to a value that does not overlap with the start bit transmitted by the transmission means 25 of the first device. If you choose, you can send and receive on the same line,
A two-wire type transmission communication path can also be used. Further, in this case, if one signal line for transmitting the transmission / reception state of the main station 15 is added, more stable transmission with respect to external noise and the like can be performed.

[0027]

According to the first means of the present invention, a master station device and a slave station device are connected to a transmission communication path for performing data transmission in a one-to-one asynchronous start-stop synchronization system, and the master station and the master station are connected to each other. The equipment consists of a synchronizing signal generating means for generating a signal synchronized with the zero voltage of the commercial power source, a transmitting means for transmitting a data transmission message, a receiving means for receiving a data transmission message transmitted from a slave station, and a data to be transmitted. Control means for giving a transmission message to the transmitting means and receiving the received data transmission message from the receiving means to control the transmitting means / receiving means by receiving a signal from the synchronizing signal generating means, and a reference from the control means. And a receiving unit that receives the data transmission message transmitted from the device serving as the master station. A transmitting means for transmitting a data transmission message, a control means for giving the data transmission message to the transmitting means, receiving the received data transmission message from the receiving means, and controlling the transmitting means, and receiving a reference signal from the control means. As a configuration that has a time counting means for counting the time period in the device that becomes the slave station, and the device that becomes the master station always sends a data transmission telegram such that the device that becomes the slave station can create the signal that becomes the reference, The relationship between the master station and the slave station can be reduced, which can reduce the load at the time of transmission / reception of the master station equipment, guarantee the accuracy of a long time of 1 second or more of the slave station equipment, and share the reference time. It is possible to realize a one-to-one device control device.

The second means of the present invention is, in addition to the configuration of the first means of the present invention, a device serving as a main station connected to a transmission communication path for performing data transmission in an asynchronous 1: N asynchronous method. In addition to the effect of the first means of the present invention, it is possible to realize a control device for a device in which the relationship between the master station and the slave station is 1: N, as a configuration in which a plurality of devices serving as a slave station and a slave station are connected. Is.

[Brief description of drawings]

FIG. 1 is a block diagram showing a device control device according to a first embodiment of the present invention.

FIG. 2 is a waveform diagram showing data on the same transmission channel.

FIG. 3 is a block diagram showing a conventional device control device.

[Explanation of symbols]

 15 Equipment as master station 16/17 Equipment as slave station 18 Transmission communication path 19 Synchronous signal generation means 20/25 Transmission means 21/24 Reception means 22/26 Control means 23/27 Clocking means

Claims (2)

[Claims] 1. A device serving as a master station and a device serving as a slave station are connected to a transmission communication path for performing data transmission in a one-to-one asynchronous start-stop synchronization system, and the device serving as the master station is a zero voltage commercial power source. A synchronization signal generating means for generating a signal synchronized with, a transmitting means for transmitting a data transmission message, a receiving means for receiving a data transmission message transmitted from a slave station, and a data transmission message for transmission to the transmitting means. Control means for receiving the received data transmission message from the receiving means and receiving a signal from the synchronizing signal generating means to control the transmitting means / receiving means, and a reference signal from the control means to become a master station. The device serving as the slave station has a receiving unit for receiving a data transmission message transmitted from the device serving as the master station, and a time transmission unit for counting the time period in the device, and transmitting the data transmission message. Transmitting means, a control means for giving a data transmission message to the transmitting means and receiving the received data transmission message from the receiving means, and controlling the transmitting means, and a device which becomes a slave station by receiving a reference signal from the control means. A control device for a device, which has a time counting means for counting the time period in the device, and the device which is a master station always sends a data transmission message so that the device which is a slave station can generate a signal serving as its reference. 2. A device control apparatus according to claim 1, wherein a device serving as a master station and a device serving as a plurality of slave stations are connected to a transmission communication path for performing data transmission in a 1: N asynchronous start-stop synchronization system.