JPH0346888A - Transmission controller - Google Patents

Abstract

PURPOSE:To prevent a load from being brought under remote control when there is a user nearby a control terminal by performing no load control by a load terminal even if a control instruction for the load is inputted from the control terminal when a human body sensor detects the presence of a human body. CONSTITUTION:An arithmetic control means 12 checks whether or not there is the control instruction from the control terminal 8 arrives at a communication means first. When a relay, etc., is put in operation to turn on or off lighting operation, information from the human body sensor 14 is checked and there is a case wherein the human body is detected. At this time, the control instruction for the load is ignored and a serial control procedure is finished without letting the load control means 13 perform any control. Namely, when the human body sensor 14 detects the human body, the load terminal 9 is inhibited from controlling remotely the load 10 connected to the load terminal 9 to secure the safety of the user.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transmission control device constituting home automation used in the home.

2. Description of the Related Art Conventionally, transmission control methods have been used in which control signals are transmitted to each other over electrical communication networks for the purpose of centrally controlling loads such as lighting and air conditioners. - For example, there is a method of using a commercial 100V power line as a transmission communication channel to control the load in a general household. This system performs communication control by superimposing a communication signal voltage of a sufficiently higher frequency on the AC voltage of the power line, and since special wiring for control is not required, the effort and cost associated with installation are small. It has the characteristics of

A transmission control device using a power line will be described below with reference to the drawings.

FIG. 9 is a configuration diagram of a conventional transmission control device using a power line. 1 is a commercial 1oov power line, which is located in a general household. Loads 4 and 6 such as lighting and air conditioners are combined with the load terminals 2 and 3, respectively, and are connected to the power line 1, respectively. The load terminals 2 and 3 have a load control function 2 and a communication function, and perform 0N10FF control on the loads 4 and 6 combined with themselves. The control terminal 6 is connected to the power line 1, and the power line 1 is connected to the power line 1 by the user's operation.
A control signal for turning on or off the loads 4 and 6 is sent to the top. The load terminal receives it and controls the load.

In this way, necessary load control can be performed remotely using the transmission channel.

Problems to be Solved by the Invention In the conventional transmission control device as described above, the transmission communication path is extended and used for remote control. For example, if you install a control device in your living room, you can control and monitor the load in your home from here without having to walk around the house. For housewives, it is possible to improve the efficiency of housework, and it is also economical because it reduces the number of times when people forget to turn off the load. Now, there is no problem when only the special user who controls the load is at home, but
Remote control poses a big problem when multiple people are in the house. In other words, the problem is that someone else can control the load by remote control, regardless of the intention of the person currently using the load. For example, there is a situation where another person accidentally turns off the lights by remote control even though there are people in the toilet or bathroom. At this time, it is not only a great nuisance for the users of the load (people in the toilet or bathroom), but also a dangerous situation for the elderly and children as they are unable to move freely in the dark.

Therefore, in order to solve this problem while taking advantage of the advantages of remote control, the first invention provides a downsized transmission control device that prevents the load from being controlled by remote control when a user is near the control terminal. do. A second aspect of the invention provides a transmission control device that accurately detects the presence or absence of a user and makes it impossible to control the load by remote control when the user is present. A third aspect of the present invention provides a transmission control device that detects the presence or absence of a user and disables remote control of a plurality of loads if necessary when a user is present.

A fourth aspect of the present invention provides a transmission control device that accurately detects the presence or absence of a user and prevents remote control of a plurality of loads if necessary when a user is present.

A sixth aspect of the invention provides a transmission control device that can detect the presence or absence of a user and prohibit the output of control commands when a user is present, thereby preventing unnecessary congestion of a transmission channel. Furthermore, a sixth aspect of the invention provides a transmission control device that can accurately detect the presence or absence of a user and prohibit output of control commands when a user is present, thereby preventing unnecessary congestion of the transmission channel.

Means to solve problems In order to achieve the above-mentioned first object, a first invention is provided.

A transmission communication channel for performing communication, a control terminal connected to the transmission communication channel and outputting a control command to the transmission communication channel, a communication means connected to the transmission communication channel, a load control means for controlling a load, and a human body. The load terminal includes a human body sensor that detects the presence or absence of a human body, and a load terminal connected to the human body sensor and a calculation control means. Further, in order to achieve the second object, a second invention provides a transmission communication path for performing communication, a control terminal connected to the transmission communication path and outputting a control command to the transmission communication path,
A load terminal having a communication means connected to the transmission communication path, a load control means for controlling the load, a human body sensor input means, and an arithmetic control means connected to these, and detecting the presence or absence of a human body and transmitting the information. It consists of a human body sensor that sends data to the control terminal.

Further, in order to achieve the third object, a third invention provides a transmission communication path for performing communication, a control terminal connected to the transmission communication path and outputting a control command to the transmission communication path, and a control terminal connected to the transmission communication path and outputting a control command to the transmission communication path. A load terminal having a communication means connected to it, a load control means for controlling the load, and an arithmetic control means connected thereto, a communication means connected to the transmission communication path, and a human body sensor for detecting the presence or absence of a human body. It consists of a sensor terminal with a

Further, in order to achieve the fourth object, a fourth invention provides a transmission communication path for performing communication, a control terminal connected to the transmission communication path and outputting a control command to the transmission communication path, and a control terminal connected to the transmission communication path and outputting a control command to the transmission communication path. A load terminal having a communication means connected to it, a load control means for controlling the load, and an arithmetic control means connected thereto, and a sensor having a communication means and a human body sensor input means connected to the transmission communication path. It consists of a terminal and a human body sensor that detects the presence or absence of a human body and sends the information to the sensor terminal.

Further, in order to achieve the sixth object, a sixth invention includes a transmission communication path for performing communication, a communication means and an arithmetic control means connected to the transmission communication path, and outputs a control command to the transmission communication path. a load terminal having a control terminal connected to the transmission communication path, a communication means connected to the transmission communication path, a load control means controlling the load, and an arithmetic control means connected thereto; and a communication means connected to the transmission communication path. and a sensor terminal having a human body sensor that detects the presence or absence of a human body.

Further, in order to achieve the sixth object, a sixth invention includes a transmission communication path for performing communication, a communication means and an arithmetic control means connected to the transmission communication path, and outputs a control command to the transmission communication path. a load terminal having a control terminal connected to the transmission communication path, a communication means connected to the transmission communication path, a load control means controlling the load, and an arithmetic control means connected thereto; and a communication means connected to the transmission communication path. and a human body sensor that detects the presence or absence of a human body and sends the information to the sensor terminal.

Operation With this configuration, in the first invention, the load terminal does not perform load control even if a load control command is input from the control terminal when the human body sensor detects that a human body is present. The second invention also has a similar effect, but the presence or absence of a human body is detected with high accuracy. The third invention also has the same effect as the first invention, but information from the human body sensor is transmitted from the sensor terminal to the load terminal via a transmission communication path. The fourth invention also has the same effect as the third invention, but detects the presence or absence of a human body with high accuracy. In the sixth invention, if the human body sensor detects that a human body is present, the information is output from the sensor terminal to the transmission channel, and at this time, no control command is output from the control terminal. The sixth invention also has the same effect as the sixth invention, but detects the presence or absence of a human body with high accuracy.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a transmission control device showing an embodiment of the first invention.

The power line 7 serves as a transmission channel as well as a power supply. The control terminal 8 is connected to the power line 7 and has a function of outputting a control signal to the power line 7 when a control request is generated by a user's operation or the like. The load terminal 9 is also connected to the power line 7, and a load 10 to be controlled is connected thereto.

Load 1o is electrical appliances such as lighting and air conditioners.

The communication means 11 of the load terminal 9 receives communication signals from the power line 7 and sends them to the arithmetic and control means 12.
2 and transmits the communication signal to the power line 7. The arithmetic control means 12 performs arithmetic control based on a predetermined procedure, so it can be realized by, for example, a microcomputer.
The load control means 13 controls the load by turning it on or off, and can be realized by a relay, a semiconductor switch, or an interface circuit using an electronic circuit if the load 1o can be electronically controlled. The human body sensor 14 detects the presence or absence of a human body near the load terminal 9 and outputs the information to the calculation control means 12. The human body sensor itself is well known, and here a pyrothermal type sensor that uses a semiconductor element and senses infrared rays from the human body can be used.

FIG. 2 is a flowchart showing the control procedure when the calculation control means 12 of this embodiment performs control.

The arithmetic control means 12 first performs a process 16 in which the communication means 1
1 is checked to see if there is a control command from the control terminal 8. If not, the control procedure is terminated and preparations are made for the next process. If a control command has been received, the process goes to process 16 and the human body sensor 14
Enter information on whether or not a human body is currently being detected. Next, in process 17, the information from this human body sensor 14 is checked, and if no human body is detected, it is determined that it is normal remote control, and the process goes to process 18, in which the load control means 13 is caused to actually control the load 1o. In other words, it operates a relay or the like to turn lights, etc. on or off. Now, in process 17, information from the human body sensor 14 is checked, and a human body may be detected. At this time, the load control command is ignored and the series of control procedures is ended without causing the load control means 13 to perform any control on the load 10. That is, when the human body sensor 14 detects a human body, the load terminal 9 prohibits remote control of the load 10 connected to the load terminal 9 to protect the safety of the user. In this way, it was possible to realize a transmission control device that solved the first objective by incorporating a human body sensor and reducing the size of the device.

FIG. 3 is a configuration diagram of a transmission control device showing an embodiment of the second invention.

The control terminal 2o is connected to the power line 19 and has exactly the same functions as the first invention. The load terminal 21 is also connected to the power line 19, and a load 22 to be controlled is connected thereto.

Communication means 23° calculation control means 24 of the load terminal 21. The load control means 26 has exactly the same function as the first invention. The human body sensor input means 26 inputs information on whether or not a human body is detected from the human body sensor 27 and outputs the information to the calculation control means 24 . The control procedure of the calculation control means 240 is exactly the same as the first invention except that the information of the human body sensor 27 is inputted via the human body sensor input means 26. The human body sensor 27 can be of the fiery type as mentioned above, or can be installed away from the load terminal 21. There is an increased degree of freedom in how to detect people, such as photoelectric type devices that detect obstructions, and devices that detect sounds made by people. In other words, the types of sensors that can be used increase. Therefore, it is possible to select the one that can most reliably detect a human body depending on the conditions of use. In addition, the human body sensor 27 is located near the person using the load 22 or
It can be installed in a location where detection is easier, such as near 2, and detection sensitivity can be increased. If the load 22 is close to the human body, a human body sensor may be incorporated into the load 22. In addition, in some cases, such as photoelectric sensors, there is a difference in the appropriate installation height for detection due to the difference in height between adults and children. In such a case, omission of detection can be prevented by OR-connecting a plurality of human body sensors (if any one of the plurality of human body sensors detects a human body, information indicating the presence of a human body is output). Missing detection can be further reduced by installing multiple human body sensors of different types. Furthermore, by connecting a plurality of human body sensors with an AND connection (information indicating the presence of a human body is output only after all the human body sensors have detected a human body), it is also possible to prevent false detection of small animals or the like. In this way, there are 9 types of human body sensors.

Detection accuracy can be increased by appropriately selecting the number, connection method, etc. Human body sensor input means 26 and human body sensor 2
The connection with 7 may be a wired type such as an electric wire or an optical cable, or a wireless type such as infrared rays or radio waves, without affecting the intention of the present invention. In the case of a wired type, the human body sensor input means 26 can be realized by a terminal for connecting an electric wire or an optical cape, and a circuit for converting the information input into a voltage necessary for transmitting it to the arithmetic control means 24. In the case of a wireless type, the human body sensor input means 27 can be realized by an infrared light receiving means, an antenna for receiving radio waves, a receiving circuit, or the like.

FIG. 4 is a configuration diagram of a transmission control device showing an embodiment of the third invention. The control terminal 29 is connected to the power line 2!8 and has exactly the same functions as the first invention.

The load terminals 30.31 are also connected to the power line 28, and the loads 32.33 to be controlled are connected thereto. Communication means 34 of load terminal 3o. Arithmetic control means 36. The load control means 36 has exactly the same function as the first invention. The load terminal 31 has the same means as the load terminal 30. The sensor terminal 37 has a communication means 38 connected to the power line 28 and a human body sensor 39 that detects the presence or absence of a human body. Information on the presence or absence of a human body detected by the human body sensor 39 is output onto the power line 28 via the communication means 38.

One control procedure of the arithmetic control means 36 is exactly the same as the first invention except that information from the human body sensor 39 is inputted from the power line 28 via the communication means 34. Here, since the information on the presence or absence of a human body is on the power line 28, which is a transmission communication path, this information can be used by both the load terminal 3o and the load terminal 31 at the same time. Therefore, in this case, it is possible to prohibit the control of multiple loads by one human body sensor.

FIG. 6 is a configuration diagram of a transmission control device showing an embodiment of the fourth invention. The control terminal 41 is connected to the power line 4° and
It has exactly the same function as the invention of .

The load terminals 42.43 are also connected to the power line 4o, and the loads 44.45 to be controlled are connected thereto. Communication means 46 of load terminal 42. Arithmetic control means 47. The load control means 48 has exactly the same function as the first invention. The load terminal 43 has the same means as the load terminal 42. The sensor terminal 49 has a communication means 6o connected to the power line 4o and a human body sensor input means 62 that inputs information from a human body sensor 61 that detects the presence or absence of a human body. Information on the presence or absence of a human body detected by the human body sensor 61 is output onto the power line 4o via the human body sensor input means 62 and the communication means 6o. The control procedure of the calculation control means 46 is exactly the same as the first invention except that the information from the human body sensor 61 is inputted from the power line 4° via the communication means 46. Here, since the information on the presence or absence of a human body is on the power line 40, which is a transmission communication path, this information can be used by both the load terminal 42 and the load terminal 43 at the same time. Therefore, in this case, it is possible to prohibit the control of multiple loads by one human body sensor. Further, the human body sensor 51 can be installed at any location as in the second invention,
There are many types of sensors that can be used, and detection sensitivity can be increased.

FIG. 6 is a configuration diagram of a transmission control device showing an embodiment of the sixth invention. The communication means group of control terminal 54 is connected to power line 63. The calculation control means 56 inputs and outputs signals to and from the power line 63 via the communication means 66. An operation means 57 is also connected to the calculation control means 56 . The operating means 67 is operated by the user when remotely controlling the load, and can be realized by a bushing switch. The load terminal on the 6th is also connected to the power line 53, and is a load 69 to be controlled.
are connected. The load 69 is electrical appliances such as lighting and air conditioners. The communication means 6o of the load terminal 68 is the power line 6
3 receives the communication signal and sends it to the arithmetic control means 61,
In addition, the communication signal generated by the calculation control means 61 is transmitted to the stress line 53.
Send to. The arithmetic control means 61 performs arithmetic control based on a predetermined procedure, and can be realized by, for example, a microcomputer. The load control means 62 controls the load 59 by turning it on or off, and can be realized by a relay, a semiconductor switch, or an interface circuit using an electronic circuit if the load 69 can be electronically controlled. The load terminal 63 is the same as the load terminal 68, and a load 64 is connected thereto.

The communication means 66 of the sensor terminal θ5 is not connected to the power line 53. A human body sensor 67 is connected to the communication means 66 . By human body sensor 67! Information on the presence or absence of the detected human body is output onto the power line 63 via the communication means 66.

FIG. 7 is a flowchart showing the control procedure of the calculation control means 5θ of the control terminal 64.

The arithmetic control means 66 checks whether the user has operated the operation means 67 in process 68. If no operation is performed, it is assumed that there is no control request and the process ends. If the operation has been performed, it is assumed that there is a control request and the process goes to step 69. In process 69, the arithmetic control means 66 checks information on the presence or absence of a human body input from the sensor terminal 65. If there is a human body, processing ends. Process 70 if there is no human body
go to In process 7o, the calculation control means 6e transmits a control command for the load 69 onto the power line 63 via the communication means 65. Now, if the control command is a command for the purpose of turning on the load 59, the arithmetic control means 61 of the load terminal 68
This control command is received via the communication means 6o, and the load control means 62 is commanded to turn on the load 59.

That is, when the human body sensor e7 detects a human body, the Mi control terminal 64 prohibits the transmission of control commands to protect the safety of the user of the load. By prohibiting the transmission of control commands in this way, the power line 63, which is a transmission communication path,
can be prevented from becoming unnecessarily crowded with information.

FIG. 8 is a configuration diagram of a transmission control device showing an embodiment of the sixth invention. The power line 71 serves as a transmission channel as well as power supply. Communication means 73 of control terminal 72 is connected to power line 71 .

The calculation control means 74 communicates with the power line 71 via the communication means 73.
Input/output signals to/from. An operation means 76 is also connected to the calculation control means 74 .

The operating means 76 is operated by the user when remotely controlling the load, and can be realized by a bushing switch. The load terminal 7e is also connected to the power line 71, and a load 77 to be controlled is connected thereto. The load 77 is an electrical appliance such as lighting or an air conditioner. The communication means 78 of the load terminal 76 receives a communication signal from the power line 71 and sends it to the arithmetic and control means 79, and also transmits the communication signal generated by the arithmetic and control means 79 to the power line 71. The calculation control means 79 is
It performs arithmetic control based on a predetermined procedure, and can be realized by, for example, a microcomputer. Load control means 8
0 controls the load 77 by turning it on or off, and if the load 77 can be controlled electronically, it can be realized by an interface circuit using a relay or a semiconductor switch. The load terminal 81 is the same as the load terminal 76, and a load 82 is connected thereto. A communication means 84 of the sensor terminal 83 is connected to the power line 71. A human body sensor input means 86 is connected to the communication means 84 . A human body sensor 86 is connected to the human body sensor input means 86 . Information on the presence or absence of a human body detected by the human body sensor 86 is transmitted to the human body sensor input means 8
5 and the communication means 84 to the power line 71. The control procedure of the calculation control means 66 of the control terminal 54 is as follows:
It is exactly the same as the invention of The control terminal 72 protects the safety of the user of the load by prohibiting the transmission of control commands when the human body sensor 86 detects a human body. By prohibiting the transmission of control commands in this way, it is possible to prevent the power line 71, which is a transmission communication path, from becoming unnecessarily crowded with information. Further, similarly to the second invention, the human body sensor 86 can be installed at any location, and there are many types of sensors that can be used, and the detection sensitivity can be increased.

In the embodiments of the first to sixth inventions described above, the transmission communication path was explained using a power line, but this can also be a dedicated electric wire, coaxial cable, optical cable, or even infrared rays or radio waves, so transmission can be carried out in a wide range of spaces. You could call it a communication channel. In addition, although the load was explained using electrical appliances such as lighting and air conditioners, it can be anything that can be controlled, such as factory machine robots and motors. Further, the control contents may be not only ON and OFF, but also brightness, speed, number of rotations, temperature, etc.

The number of control terminals and load terminals may be singular or plural without affecting the intent of the present invention.

Effects of the Invention The transmission control device of the present invention performs or ignores remote control of a load based on information from a human body sensor, thereby maintaining the convenience of remote control while also controlling the load against the will of the person using the load. I was able to solve the problem of others controlling the load incorrectly.

This not only improves the convenience of operation through remote control and the economical efficiency of eliminating forgetting to turn off the light, but also improves the safety for the person using the load.

In particular, in the first aspect of the invention, the structure can be simplified by incorporating the human body sensor into the load terminal, thereby reducing the size and cost. Another advantage is that the configuration is simple and there are fewer failures because there is no need to route wires to the outside. No location other than the load terminal is required for installation.

Further, in the second invention, by separating the human body sensor from the load terminal, the types of human body sensors that can be used can be significantly increased. The installation location can be freely selected, such as near the human body or near the load, and multiple human body sensors can be OR-connected, making it possible to significantly improve the accuracy of human body detection.

By AND-connecting multiple sensors, there is also the effect of reducing false detections. Serviceability is also good because it is easy to replace the human body sensor when it breaks down. Workability is also good because the human body sensor and load terminal are not restricted in their installation locations.

In the third invention, by transmitting information on the presence or absence of a human body from the sensor terminal, it is possible to prevent remote control of a plurality of loads, and it is possible to reduce the cost related to the human body sensor.

In the fourth invention, the effects of the second and third inventions can be combined.

The sixth invention has the effect of the third invention by transmitting information on the presence or absence of a human body from the sensor terminal and prohibiting the output of control signals from the control terminal, and also reduces congestion in the transmission communication channel. This can relatively increase the information transmission speed of the entire system.

For example, important information such as security information is prevented from being delayed due to congestion on the transmission channel, resulting in a more secure system.

In the sixth invention, the effects of the second and sixth inventions can be combined.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the transmission control device of the first invention, and FIG. 2 is a flowchart showing the control procedure of an embodiment of the transmission control device of the first and second inventions. Figure 3 is the second
FIG. 4 is a block diagram showing an embodiment of the transmission control device of the third invention;
FIG. 6 is a block diagram showing an embodiment of the transmission control device of the fourth invention, FIG. 6 is a block diagram showing an embodiment of the transmission side control device of the sixth invention, and FIG. Flowchart showing the control procedure of an embodiment of the transmission control device of the invention and the sixth invention, No. 8
The figure is a block diagram showing the -actual side of the transmission control device of the sixth invention, and the ninth figure is a block diagram showing the conventional transmission control device. 7.19.2B, 40, 53.71... Power line, 8.20, 29, 41.54.72... Control terminal, 9.21.30, 31.42, 43 .5B, 63
゜78.81... Load terminal, 14, 27, 39
, 51°67.86...Human body sensor.

Claims (6)

[Claims] (1) A transmission channel for communication, a control terminal connected to the transmission channel and outputting a control command to the transmission channel, and a load control device that controls the communication means and load connected to the transmission channel. a human body sensor for detecting the presence or absence of a human body, and a load terminal having an arithmetic control means connected thereto, and when the human body sensor detects that a human body is present, the load terminal A transmission control device that does not perform load control even if a load control command is input. (2) A transmission channel for communication, a control terminal connected to the transmission channel and outputting a control command to the transmission channel, and a load control device that controls the communication means and load connected to the transmission channel. A load terminal having a human body sensor input means and an arithmetic control means connected thereto, and a human body sensor that detects the presence or absence of a human body and sends the information to the load terminal, and the load terminal includes: A transmission control device that does not perform load control even if a load control command is input from the control terminal when a human body sensor detects the presence of a human body. (3) A transmission communication channel for performing communication, a control terminal connected to the transmission communication channel and outputting a control command to the transmission communication channel, and load control for controlling the communication means and load connected to the transmission communication channel. a load terminal having means and an arithmetic control means connected thereto, a communication means connected to the transmission communication path and a human body sensor for detecting the presence or absence of a human body, and transmits information on the presence or absence of a human body over the transmission communication path. When the human body sensor of the sensor terminal detects the presence of a human body and inputs information to that effect from the transmission channel, the load terminal controls the load from the control terminal. A transmission control device that does not perform load control even if a command is input. (4) A transmission communication path for performing communication, a control terminal connected to the transmission communication path and outputting a control command to the transmission communication path, and a load control that controls the communication means and load connected to the transmission communication path. a load terminal having means and an arithmetic control means connected thereto, a communication means connected to the transmission communication path and a human body sensor input means, and outputting information on the presence or absence of a human body onto the transmission communication path. It is composed of a terminal and a human body sensor that detects the presence or absence of a human body and sends the information to the sensor terminal, and the load terminal detects that the human body sensor connected to the sensor terminal detects that a human body is present and sends information to that effect. A transmission control device that does not perform load control even if a load control command is input from the control terminal when input is input from a transmission communication channel. (5) a transmission communication channel for performing communication; a control terminal connected to the transmission communication channel and having a communication means and an arithmetic control means and outputting a control command to the transmission communication channel; A load terminal having a communication means connected to the transmission communication path, a load control means for controlling the load, and an arithmetic control means connected to these, a communication means connected to the transmission communication path, and a human body sensor for detecting the presence or absence of a human body. and a sensor terminal that outputs information on the presence or absence of a human body onto the transmission communication path, and when the human body sensor of the sensor terminal detects that a human body is present and the sensor terminal outputs information to that effect on the transmission communication path, the The control terminal is a transmission control device that does not output control commands. (6) a transmission communication channel for performing communication; a control terminal connected to the transmission communication channel and having a communication means and an arithmetic control means and outputting a control command to the transmission communication channel; a load terminal having a communication means for controlling the load, a load control means for controlling the load, and an arithmetic control means connected to these, a communication means and a human body sensor input means connected to the transmission communication path, The sensor terminal outputs information on a transmission communication path, and the human body sensor detects the presence or absence of a human body and sends the information to the sensor terminal, and the human body sensor connected to the sensor terminal detects the presence of a human body. A transmission control device in which the control terminal does not output a control command when a sensor terminal outputs information to that effect on a transmission communication path.