JP5774529B2 - Control signal processing system, control signal transmission device, and command processing method - Google Patents

Description

  Embodiments described herein relate generally to a control signal processing system, a control signal transmission apparatus, and a command processing method for a synchronous system.

  In an information processing system that switches operation states of a plurality of devices and devices at the same timing, it is important that a plurality of controlled devices switch operations in accordance with a command from the control device.

  For example, a broadcast station master system is composed of studio equipment, server equipment, switchers, faders, encoders, multiplexers, and other signal transmission equipment, broadcast equipment such as APC that controls them in real time, and a control network. As a result, precise command and response processing in units of one field on the screen is required.

  In other words, the control of broadcasting equipment requires accuracy in units of one field (about 16 msec), and a shift of one field causes a problem such as “flickering” on the screen and is subject to complaints that are treated as broadcast ill-treatment. It may become.

  Conventionally, a real-time control method has been executed in which control is performed at the timing of the immediately preceding field with respect to the target switching timing. However, when retry processing or the like occurs due to packet loss of a control command or the like, delay or control loss occurs. May occur and processing within one field may not be possible.

  In the switching command transmission method for broadcasting equipment, a method of repeatedly transmitting the same command to prevent packet loss has been devised, but the devices in the studio are aligned at the same time via a network or the like. It is not effective for synchronous switching for switching (for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2003-264741

  Conventionally, a real-time control method that performs control at the timing of the immediately preceding field with respect to the target switching timing has been executed. However, when packet loss such as a control command, retry processing, etc. occurs, delay or control loss occurs. There was a problem that caused a bug.

  The problem to be solved by the present invention is to provide a control signal processing system, a control signal transmission device, and a command processing method that realize control accuracy of one field.

  In order to achieve the above object, the control signal processing system of the present embodiment is an information processing system in which each device in the system refers to a certain periodic synchronization signal and executes a command transmitted / received via a network. In the control signal processing system, the controlled device refers to the synchronization signal and adds a field count number preceding the synchronization field of the target on which the controlled device performs an operation to the controlled device via the network following the synchronization signal. If the ACK response from the controlled device is not received, the count number is subtracted by one from the next synchronization field after transmitting the command, and the command is synchronized with the synchronization immediately before the target. A command transmission means accommodated in the control device for transmitting up to the field; and When the command is received from the network, an ACK response is transmitted and the command is stored in the storage means. Then, each time a signal indicating the start of the synchronization frame is received, the stored command is read and the count number is decremented by one. When the count reaches 0, the command receiving means for outputting the received command in the synchronization field immediately after that and the command receiving means connected to the command receiving means for outputting the command in the synchronization field to which the command is output. And functional processing means for executing the command.

  The control signal transmission device of the present embodiment is the control signal transmission device of the information processing system in which each device in the system refers to a certain periodic synchronization signal and executes a command transmitted / received via a network. A command added with a field count number preceding the synchronization field of the target on which the controlled device performs an operation with reference to the synchronization signal, and then transmitted to the controlled device via the network, When the ACK response from the controlled device is not received, the control device that transmits the command obtained by subtracting the count number by one to the next synchronization field after transmitting the command up to the synchronization field immediately before the target is accommodated. Command transmission means, and received in the controlled device and receiving the command from the network. In this case, an ACK response is transmitted and the command is stored in the storage means. Then, each time a signal indicating the start of a synchronization frame is received, the stored command is read and the count number is decremented by one. And a command receiving means for outputting the received command in the synchronization field immediately after that.

  Furthermore, the command processing method of the control signal processing system according to the present embodiment includes command transmission means accommodated in the control device, command reception means accommodated in the controlled device, and function processing means, which are connected to the information system. In the command processing method of an information processing system in which each of the devices refers to a certain periodic synchronization signal and executes a command transmitted / received via a network, the command transmission means refers to the synchronization signal, A command in which the control device adds a field count number preceding the synchronization field of the target on which the operation is performed is transmitted to the controlled device via the network following the synchronization signal, and the next synchronization in which the command is transmitted The command obtained by subtracting the count number by one in the field is used as the synchronization field immediately before the target. When the command receiving means receives the command from the network, the command receiving means stores the command in the storage means, and then reads the command every time a signal indicating the start of a synchronization frame is received, and sets the count number. When 1 is subtracted and the count number becomes 0, the received command is output to the function processing means in the immediately following synchronization field, and the function processing means is connected to the command receiving means, and the count number The output command is executed in the synchronization field next to the synchronization field in which the command is output when 0 becomes 0.

The systematic diagram of the system explaining operation | movement of the broadcasting station to which the control signal processing system concerning this embodiment is applied. The sequence diagram explaining the relationship of the transmission timing of the basic switching command of a control signal processing system. The frame block diagram which shows an example of a structure of the packet of command transmission / reception. The sequence diagram explaining the relationship between a vertical field and the timing at which a command is transmitted. The functional block diagram explaining operation | movement of a node in this embodiment. The flowchart explaining the process sequence of each node. The flowchart explaining another example of the processing procedure of each node.

  A control signal processing system according to an embodiment will be described below with reference to the drawings.

  FIG. 1 is a system diagram illustrating the operation of a broadcasting station to which the control signal processing system according to this embodiment is applied.

  In FIG. 1, the control signal processing system NS of the present embodiment includes a node Q, a node q (# 1) to a node that are accommodated (connected) by the driving unit 21 and the broadcasting devices 61 to 63 of the automatic program transmission control device 2. q (# 3) and a transmission medium L for connecting these nodes.

  The automatic program transmission control device 2 is connected to the clock device 41 and broadcasts with control data created from the operation data of the program progress supplied from the operation data creation device 10 with reference to the time information and the synchronous clock supplied therefrom. Switching control of the devices 61 to 63 is performed.

  From the operation data creation device 10, operation data for switching and controlling the broadcasting devices 61 to 63 in accordance with the broadcast program based on the program timetable is input to the automatic program transmission control device 2. The operation data is stored and held in time series as a list table in the holding unit 24, and is sequentially sent to the read output unit 252 of the control unit 25 according to the synchronization clock and the vertical synchronization signal generated therefrom.

  The control unit 25 reads the read control data, refers to the time information and the synchronization signal, and switches and controls the broadcasting devices 61 to 63 at further detailed timing.

  For example, the broadcast device 61 corresponds to a switcher (switcher) that switches a program output system, the broadcast device 62 corresponds to a CM material server that stores CM material, and the broadcast device 63 corresponds to a program material server that stores program material. Then, the automatic program transmission control device 2 matches all the (BCD) time data from the clock device 41 and further refers to a synchronization signal with a period of 16 msec, and sets all the broadcasting devices 61 to 63 to the same vertical field start timing. Switch together.

FIG. 2 is a sequence diagram for explaining the relationship of basic switch command transmission timings in the control signal processing system.
FIG. 2A shows a control device (here, the node Q accommodated in the drive device 21 of the automatic program transmission control device 2) and a controlled device (here, the switcher of the broadcasting device 63). The relationship between the command to the node q (# 3)) and the ACK signal for notifying normal reception thereof is shown. FIG. 2B shows an example of retry when an ACK signal cannot be received.

  In order to detect the packet loss or the like and reliably retransmit the data, the control device sends the controlled device to the controlled device at an early timing of the field T0 immediately before reaching the timing “tx” of the switching target to be switched. Send "command". When the controlled device correctly receives the “command”, it returns a reception response “ACK”.

  If the control device does not receive “ACK” within a predetermined time after sending the command in the immediately preceding field, it sends a retry “command” again, but the command arrives after the timing “tx” of the switching target. It may also occur.

  The signal arrival time between the control device and the controlled device varies depending on the access procedure and network architecture, but in principle, the command is transmitted with an assumed lead time that can ensure real-time performance within one vertical field period or less. . Conventionally, a control data network using tokens has been used to prevent packet loss and collisions, but the response has been slow and the equipment has become complicated, for example, the procedure from the data link layer has become complicated. .

  In the present embodiment, the control signal processing method will be described by taking as an example a method in which command data can be reliably transmitted / received even in the CSMA / CD method using the TCP / IP procedure for packet data.

FIG. 3 is a frame configuration diagram showing an example of the configuration of a command transmission / reception packet.
FIG. 3A shows the main frame structure of the command packet xp when the automatic program transmission control device 2 as the control device and the broadcast device 61... As the controlled device transmit and receive control signals in bursts. FIG. For example, the command packet is transmitted in bursts from the node Q of the automatic program transmission control apparatus 2 to the controlled apparatus to be controlled in a CSMA / CD procedure. In order to facilitate the explanation, commands are sent to one controlled device at a time here, but they may be sent to a plurality of nodes such as broadcast.

  When a command is transmitted by this CSMA / CD method, the higher the physical transmission rate called Gigaisa (registered trademark) is used, the less time it takes to transmit and receive commands on the network (transmission medium L). It is possible to reduce the probability and improve command arrival by retransmission.

  Conventionally, as shown in FIG. 3A, a frame xp of a command packet transmitted from a node of a control device contains a transmission source ID field f1, a transmission destination ID field f2, and subsequently a transmission destination node. It includes control information for a device, a command field f4, an FEC (error correction) field ff, and the like.

  The node of the controlled device that has received the command transmits, for example, an ACK response as shown in FIG.

  In the present embodiment, in order to ensure that the command is notified at the timing “tx” of the switching target including the possibility of retry, there are several vertical fields to be transmitted in advance with respect to the currently transmitted synchronization field. Preceding field information indicating whether the synchronization field after the eye is the timing for executing the command is added. On the controlled device side, by counting the number of preceding fields, the controlled device can execute the processing procedure at the correct timing even with a retry command.

  FIG. 3C shows a frame xp of a command transmission packet sent from the node Q of the control signal processing system according to the present embodiment includes an F # (vertical field number) field fv in addition to the configuration of FIG. It shows that it has. This F # fv is a number described with the vertical field immediately before the switching target being numbered “0” and the number incremented by one each time it is moved forward by one.

  Here, the procedure for continuously transmitting a series of command packet frames to a plurality of controlled devices from the control device side is illustrated, but a command is sent to all the controlled devices in one vertical synchronization. If the timing or frequency is such that it arrives at any time, either polling that sequentially sends command packets to one device at a time, a procedure such as command response, or a token method that targets multiple good.

FIG. 4 is a sequence diagram illustrating the relationship between the vertical field and the timing at which the command is transmitted.
In FIG. 4, the vertical field is repeated with a period of 16.6 ms. As shown in FIG. 1, the automatic program sending device 1 that is a control device and the broadcast devices 61 and the like that are controlled devices are connected to each node Q and nodes q (# 1 to # 3) with a clock. Although not shown, a reference synchronous clock sent from the device 41 is input by a signal transmission means such as a signal cable or radio. A common vertical synchronization signal of 16.6 ms is generated in each apparatus with reference to this synchronization clock.

  In the vertical synchronization field, it is necessary that the node q of the controlled broadcast device has received the command in the period To immediately before the period (field) Ta in which the switching process starting at the switching target tx in FIG. 4 is performed. .

  In the procedure shown in FIG. 2, a packet loss occurs and the command cannot be received. In this embodiment, the number of transmissions is notified to the receiving side in the field fv. Here, the command is transmitted over three fields, and once. But if you receive it, you can execute the command.

  FIG. 5 is a functional block diagram for explaining the operation of the node in this embodiment, and FIG. 6 is a flowchart for explaining the processing procedure of each node.

  Hereinafter, command processing in the present embodiment will be described with reference to FIGS.

  In FIG. 5, nodes Q and q (# 1...) Are nodes accommodated in or connected to the automatic program transmission control apparatus 2 or the broadcasting equipment 61. As the transmission medium L, a communication cable, an optical fiber, a wireless LAN, or the like is used. Further, the node Q and the node q (# 1...) Are connected to each function processing unit 7 that functions as the automatic program transmission control device 2 or the broadcasting equipment 61... By an internal bus or an interface circuit. ing.

  In the automatic program transmission control device 2, the drive unit 21 corresponds to the function processing unit 7, and control data, commands, and the like described in the list table for the broadcasting device 61. Input / output via.

  The node communication management unit 6 manages frames transmitted / received to / from the transmission medium L while referring to the application or the node protocol and the vertical synchronization signal output from the synchronization processing unit 5. The assembling unit 4 assembles the transmission signal input from the function processing unit 7 into a predetermined field or packet frame and outputs the assembled signal to the CODEC 2. The configurations and functions of the control device node Q and the controlled device node q are the same except that the communication management unit 6 is on the control device side or the controlled device side and the processing procedure is differently described below. is there.

  The CODEC 2 performs a predetermined encoding on the input baseband signal and outputs it to the transceiver 1. The transceiver 1 converts a signal with the CODEC 2 into an electric signal corresponding to the transmission medium L, or a signal such as light or radio wave. The decoding unit 3 decomposes the packet signal input from the CODEC 2 into a predetermined frame or field, outputs it to the bus line, and notifies the communication management unit 6.

  Here, writing to and reading from the F # field fv shown in FIG. 3 is performed by the assembling unit 4 and the decoding unit 3 through the bus line in accordance with instructions from the communication management unit 6. Now, an example of the operation when the communication management unit 6 receives control data and commands related to switching of the switcher of the broadcasting device 61 from the function processing unit 7 will be described.

  The communication management unit 6 of the second node Q of the automatic program transmission apparatus receives command information from the function processing unit 7 (step s1 in FIG. 6). Then, when it is understood that the input control data is high-priority switching that is repeatedly transmitted three times, the time information of switching designation and the timing of the synchronization signal of the vertical field corresponding to the switching timing are set as the timing tx of the switching target. Set.

  The command packet xp (#n) to be transmitted is generated by the assembling unit 4 in advance at this timing tx, and “2” is set in the F # field fv (step s2). When the vertical synchronization signal is output from the synchronization processing unit 5 at the timing tb2, a signal encoded by the CODEC 2 is transmitted from the transceiver 1 to the broadcasting device 61 as a command transmission destination via the transmission medium L ( Step s3).

  In the node Q, at the same time as the command transmission, the communication management unit 6 monitors whether or not an ACK signal is received from the node q of the controlled device until the next vertical synchronization timing tb1 when a timer (not shown) is started.

  In the broadcasting device 61, the signal received via the transceiver 1 of the node q is decoded by CODEC, and the received signal is transferred to the decoding unit 3. When monitoring and receiving a command addressed to itself from the transmission destination ID (address) of the command packet, the command is stored in an internal memory (not shown) and the command reception is notified to the communication management unit 6 of the node q. In response to the command reception, for example, the communication management unit 6 creates an ACK response packet xa of FIG. 3B and transmits an ACK signal to the automatic program transmission control device 2 as shown in FIG. s5).

  Then, in the node Q, if an ACK is received during the same vertical synchronization field, that is, by the timing tb1 of the next vertical synchronization signal synchronization (when step s9 is Yes), the management of the command is terminated and a new command is received. The process proceeds (step s12).

  However, if the ACK is not received by the timing tb1 as in the Tb2 field in FIG. 4B (step s9 is No), the control device node Q does not receive the command to the other party. Or, although not shown here, it is determined that a packet loss has occurred as to whether the ACK signal has disappeared.

  Then, the F # field fv of the transmitted packet xp is read, and if it is not “0” (when step s10 is No), the count number of the F # field fv is decremented by 1 (for example, “2” is changed to “1”). Or “1” to “0”) (step s10). Subsequently, the command packet xp is retransmitted again in the vertical synchronization field starting at the next vertical synchronization timing tb1 (step s3).

  On the other hand, the node q of the controlled device that has transmitted the ACK signal subtracts 1 from the count number of the F # field fv of the stored command packet xp at each timing of receiving the vertical synchronization signal from the synchronization processing unit 5 (for example, At timing tb1, “2” is set to “1”, or at timing tb0, “1” is set to “0”) (step s6). When a retransmitted command is received, the F # field fv is set to “1” at the time of reception. When a re-transmission packet is received, “0” is set.

  Then, if the F # field fv is checked and the command is received including the case where it is retransmitted, the F # field fv is counted as “0” at the switching target timing tx (Yes in step s7). .), It is determined that the stored command is to be executed, and the command is output to the function processing unit 7. The function processing unit 7 executes the switching operation set by the command (step s8).

  In the above description, the command is output to the function processing unit 7 at the timing of the switching target tx when the count becomes “0”, and the operation specified by the command is executed in the synchronization field. When the command is received before “0” becomes “0”, the command is transmitted to the function processing unit 7 together with the count numbers “2” to “0”, and the function processing unit 7 waits for the command to be executed. The function processing unit 7 may determine and execute at the timing when is output. Which command output method is used depends on how to take the lead time of the information processing system.

  In the above processing procedure, when ACK cannot be received by the node Q until the next vertical synchronization signal is received (step s9 is No), when the F # field fv is “0” in step s10 (Step s10 is Yes), the program automatic transmission apparatus 2 determines that the command does not reach the other party in the vertical field (timing) where the command can be executed even if the command is transmitted three times, and is defined separately. A rescue procedure is performed (step s13).

  As described above, if the command is transmitted three times and the command is successfully received at the node q at the third time at the worst, the required command is executed on the controlled device side, for example, a broadcast in which the switcher sends a predetermined program content Switch to the device. In addition, although 3 times was demonstrated here as a repetition number, it cannot be overemphasized that it may be 2 times or 4 times or more.

  According to at least one embodiment described above, in a system that operates in a certain synchronization cycle, the command is not only transmitted repeatedly, but the command is also sent to the synchronization field before the synchronization field that executes the command. By repeatedly transmitting the command together with the preceding information indicating the number of preceding fields before executing the command, the command can be reliably executed even if there is a command or ACK packet loss.

  In addition, when a command is transmitted from the control device side, the method of repeatedly notifying the controlled device in advance of the timing of the command execution field as described above is used when the same command is transmitted to a plurality of controlled devices. Is also effective. In this case, the command is repeatedly transmitted until ACK responses are received from all the nodes q of the controlled devices, but the node q of the controlled device that has already received the command has one count in the F # field fv. Since the command is repeatedly received at a reduced rate, there is no mistake in command execution timing.

  Even if the ACK response is omitted, since the node q of the controlled device repeatedly receives the command, it is possible to execute the command at the correct timing.

FIG. 7 is a flowchart illustrating the processing procedure of another example of the present embodiment.
In the processing procedure shown in FIG. 7, the node Q on the control device side repeatedly transmits the command to the node q on the controlled device side with the preceding field information added without relying on the ACK response. On the controlled device side, the same command is repeatedly received, but since F # counting the preceding field becomes “0”, the synchronization field for executing the process can be specified.

  That is, in the broadcasting station using the control signal processing system according to the present embodiment, even when a plurality of servers for transmitting contents are switched simultaneously, the switchers, servers, etc. can be switched together in the same vertical synchronization field.

  In the above, the embodiment has been described by taking the operation at the broadcasting station as an example, but the operation is switched by a synchronization signal repeated in the same cycle, and can be similarly applied to, for example, a communication network device, its monitoring device, or a network system. Needless to say.

  Here, the command is transmitted by accessing the network by the CDMA / CD method. However, even when the number of devices constituting the broadcasting station system is large, the command can be sent only to a specific device, so an unnecessary network Congestion can be avoided. Since the command is repeatedly transmitted even if the packet collision or ACK response, which has been a concern in the conventional CSMA / CD method, is lost, the other party does not use a complicated protocol like the conventional token method until the necessary timing. The command can be reached steadily first.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Transceiver 2 Automatic program transmission control apparatus 21 Drive part 21
3 Decoding unit 4 Assembly unit 41 Clock device 5 Synchronization processing unit 6 Communication management unit 61-63 Broadcasting device 7 Function processing unit fv F # field L Transmission medium Q, q Nodes tb0, tb1, tb2 Vertical synchronization timing Ta, T0, Tb1 , Tb2 vertical synchronization field tx switching target timing xp command packet xa response packet

Claims (9)

In a control signal processing system of a broadcasting station in which each device in the system refers to a certain periodic synchronization signal and executes a command transmitted / received in a CSMA / CD system via a network,
Referring to the synchronization signal, and sending a command with a field count number preceding the synchronization field of the target on which the controlled device performs an operation to the controlled device following the synchronization signal to the controlled device, A control device that, when not receiving an ACK response from the controlled device, subtracts the count number by one from the next synchronization field after transmitting the command and transmits the command to the synchronization field immediately before the target A command transmission means accommodated in
When the command is received by the controlled device and received from the network, an ACK response is transmitted and the command is stored in the storage means, and then the stored command is received each time a signal indicating the start of a synchronization frame is received. A command receiving means for reading and subtracting the count number by 1 and outputting the received command in the synchronization field immediately after the count number becomes 0;
A control signal processing system comprising: function processing means connected to the command receiving means and executing the output command in a synchronization field to which the command is output. In a control signal processing system of a broadcasting station in which each device in the system refers to a certain periodic synchronization signal and executes a command transmitted / received in a CSMA / CD system via a network,
Referring to the synchronization signal, and sending a command with a field count number preceding the synchronization field of the target on which the controlled device performs an operation to the controlled device following the synchronization signal to the controlled device, Command transmission means accommodated in a control device for transmitting the command obtained by subtracting the count number by one to the next synchronization field that transmitted the command to the synchronization field immediately before the target;
When the command is received by the controlled device and received from the network, the command is stored in a storage unit, and the stored command is read out every time a signal indicating the start of a synchronization frame is received, and the count number is calculated. Command receiving means for subtracting 1 and outputting the received command in the synchronization field immediately after the count number becomes 0,
A control signal processing system comprising: function processing means connected to the command receiving means and executing the output command in a synchronization field to which the command is output. In a control signal processing system of a broadcasting station in which each device in the system refers to a certain periodic synchronization signal and executes a command transmitted / received in a CSMA / CD system via a network,
Referring to the synchronization signal, and sending a command with a field count number preceding the synchronization field of the target on which the controlled device performs an operation to the controlled device following the synchronization signal to the controlled device, Command transmission means accommodated in a control device for transmitting the command obtained by subtracting the count number by one to the next synchronization field that transmitted the command to the synchronization field immediately before the target;
When the command is received by the controlled device and received from the network, the command is stored in a storage unit, and the stored command is read out every time a signal indicating the start of a synchronization frame is received, and the count number is calculated. Command receiving means for decrementing one and outputting the received command together with the count number in the synchronization field immediately thereafter until the count number becomes zero;
Functional processing means connected to the command receiving means for executing the output command in a synchronization field next to the synchronization field from which the command having the count number of 0 is output. Control signal processing system. The control device is an automatic program transmission control device , the controlled device is a broadcasting device connected to the automatic program transmission control device via the network, and the synchronization signal is a vertical synchronization signal of television broadcasting. The broadcast station control signal processing system according to claim 1, wherein the broadcast station control signal processing system is provided. In a control signal transmission device of a broadcasting station that executes a command transmitted and received in a CSMA / CD system via a network with reference to a certain periodic synchronization signal by each device in the system,
Referring to the synchronization signal, and sending a command with a field count number preceding the synchronization field of the target on which the controlled device performs an operation to the controlled device following the synchronization signal to the controlled device, When the control device that does not receive the ACK response from the controlled device transmits the command obtained by subtracting the count number by one to the next synchronization field after transmitting the command to the synchronization field immediately before the target Contained command transmission means; and
When the command is received by the controlled device and received from the network, an ACK response is transmitted and the command is stored in the storage means, and then the stored command is received each time a signal indicating the start of a synchronization frame is received. A command receiving means for reading and subtracting the count number by one and outputting the received command in the synchronization field immediately after the count number becomes zero;
A control signal transmission apparatus comprising the control signal transmission apparatus. In a control signal transmission device of a control signal processing system of a broadcast station that executes commands transmitted and received in a CSMA / CD system via a network with reference to a certain periodic synchronization signal in each device in the system,
Referring to the synchronization signal, and sending a command with a field count number preceding the synchronization field of the target on which the controlled device performs an operation to the controlled device following the synchronization signal to the controlled device, Command transmission means accommodated in a control device for transmitting the command obtained by subtracting the count number by one to the next synchronization field that transmitted the command to the synchronization field immediately before the target;
When the command is received by the controlled device and received from the network, the command is stored in the storage means, and then the command is read and the count number is incremented by 1 every time a signal indicating the start of the synchronization frame is received. A command receiving means for outputting the received command in the synchronous field immediately after the subtraction and the count number becomes 0;
A control signal transmission apparatus comprising the control signal transmission apparatus. In a control signal transmission device of a control signal processing system of a broadcast station that executes commands transmitted and received in a CSMA / CD system via a network with reference to a certain periodic synchronization signal in each device in the system,
Referring to the synchronization signal, and sending a command with a field count number preceding the synchronization field of the target on which the controlled device performs an operation to the controlled device following the synchronization signal to the controlled device, Command transmission means accommodated in a control device for transmitting the command obtained by subtracting the count number by 1 to the next synchronization field that transmitted the command to the synchronization field immediately before the target;
When the command is received by the controlled device and received from the network, the command is stored in the storage means, and then the command is read and the count number is incremented by 1 every time a signal indicating the start of the synchronization frame is received. Command receiving means for subtracting and outputting the received command together with the count number in a synchronization field immediately thereafter until the count number becomes zero;
A control signal transmission apparatus comprising the control signal transmission apparatus. A command transmission means accommodated in the control device, a command reception means accommodated in the controlled device, and a function processing means, each device connected to the control signal processing system refers to a fixed periodic synchronization signal In a broadcast station control signal command processing method for executing a command transmitted / received in a CSMA / CD system via a network,
The command transmission means includes
Referring to the synchronization signal, and sending a command with a field count number preceding the synchronization field of the target on which the controlled device performs an operation to the controlled device following the synchronization signal to the controlled device, Sending the command to the next synchronization field that sent the command, subtracting the count by one to the synchronization field immediately before the target;
When the command receiving means receives the command from the network, the command receiving means stores the command in the storage means, and then reads the command every time a signal indicating the start of a synchronization frame is received and subtracts the count number by one. When the count number becomes 0, the received command is output to the function processing means in the synchronization field immediately after that,
The function processing means is connected to a command receiving means, and executes the output command in a synchronization field next to the synchronization field from which the count is 0 and the command is output.
A command processing method for a control signal processing system. A command transmission means accommodated in the control device, a command reception means accommodated in the controlled device, and a function processing means, each device connected to the control signal processing system refers to a fixed periodic synchronization signal In the broadcast station command processing method for executing a command transmitted / received in the CSMA / CD system via a network,
The command transmission means accommodated in the control device refers to the synchronization signal, and adds a field count number preceding a synchronization field of a target on which the controlled device performs an operation to the command following the synchronization signal. The command obtained by transmitting the command to the controlled device via a network and subtracting the count number by one from the next synchronization field after transmitting the command when an ACK response from the controlled device is not received. To the sync field immediately before the target,
When receiving the command via the network, the command receiving means accommodated in the controlled device returns an ACK response and stores the command in the storage means, and then receives a signal indicating the start of a synchronization frame Each time the stored command is read out, the count number is decremented by one, and when the count number becomes 0, the received command is output in the next synchronization field.
A command processing method for an information processing system.

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