Abstract: Air conditioning related equipment includes a communication circuit that is communicably connected via at least two of a communication line through which a communication signal is transmitted, a high-voltage power source line through which high-voltage power is transmitted, and a low-voltage power source line through which low-voltage power is transmitted.

Abstract: As a means for solving the problem, there is provided an adhesion-reducing agent composition for adhesive film work, which contains 0.10% by weight or more of one or more selected from aqueous (meth)acrylic resins, polysaccharides, and polyvinyl alcohol resins.

Abstract: An indoor unit included in an air conditioner that includes an outdoor unit includes a power receiving circuit (PR2), a low-frequency transmission and reception circuit as a first reception circuit, a high-frequency transmission and reception circuit as a transmission and reception circuit, and an inner-controller. The low-frequency transmission and reception circuit receives a current signal transmitted from an outdoor unit by using a current loop formed by a power line included in power supply wiring. For a first communication state in which physical connection between with the outdoor unit is recognized and a second communication state in which communication for operation of the air conditioner is performed between with the outdoor unit, the inner-controller selects use of the low-frequency transmission and reception circuit and the high-frequency transmission and reception circuit in the first communication state and the second communication state.

Abstract: Air conditioning-related equipment includes: a first connection portion to which wiring for transmitting high voltage along with communication is connected; a second connection portion to which wiring dedicated to communication and not to power transmission or wiring for transmitting low voltage along with communication is connected; and a connection circuit that connects the first connection portion and the second connection portion, wherein the connection circuit includes an isolation circuit that blocks power transmission and transmits a signal pertaining to communication.

Abstract: A relay device is provided between a first air-conditioning related apparatus and a second air-conditioning related apparatus. The first air-conditioning related apparatus and the second air-conditioning related apparatus perform multi-hopping communication via a transmission line. The relay device relays the multi-hopping communication.

Abstract: In an air conditioner using a power supply wiring connected between an outdoor unit and an indoor unit for communication between the indoor unit and the outdoor unit, noise transmitted from the power supply wiring to a power supply due to the communication is reduced. An indoor unit has power input terminals that receive power. An outdoor unit is connected to a first power supply and includes power supply terminals that supply power from the first power supply. In an air conditioner, in order to supply power from the outdoor unit to the indoor unit, in some cases, the power input terminal and a power supply terminal are connected by a first power supply line, and a first communication device and a second communication device are connected by a first signal line.

Abstract: A communication apparatus includes: a coupler to be proximately coupled to a communication line connected between communication devices; and a communicator configured to communicate with the communication devices via the communication line and the coupler proximately coupled.

Abstract: An air-conditioning apparatus includes a first transmission channel, a plurality of second transmission channels different from the first transmission channel, a controller connected to the first transmission channel and not connected to the second transmission channels, a plurality of air-conditioning indoor units connected to the second transmission channels and not connected to the first transmission channel, and a plurality of air-conditioning outdoor units. The plurality of air-conditioning outdoor units electrically connect the first transmission channel and the second transmission channels, and do not transmit a short-circuit state occurring in one of the first transmission channel and the second transmission channels to a transmission channel other than the one of the first transmission channel and the second transmission channels, thereby enabling communication between devices connected to the transmission channel other than the one.

Abstract: An indoor unit included in an air conditioner that includes an outdoor unit includes a power receiving circuit (PR2), a low-frequency transmission and reception circuit as a first reception circuit, a high-frequency transmission and reception circuit as a transmission and reception circuit, and an inner-controller. The low-frequency transmission and reception circuit receives a current signal transmitted from an outdoor unit by using a current loop formed by a power line included in power supply wiring. For a first communication state in which physical connection between with the outdoor unit is recognized and a second communication state in which communication for operation of the air conditioner is performed between with the outdoor unit, the inner-controller selects use of the low-frequency transmission and reception circuit and the high-frequency transmission and reception circuit in the first communication state and the second communication state.

Abstract: In a device network system, system recognition processing that identifies a device connected by a wired line is performed using a low-frequency signal of a frequency lower than a first frequency used in communication, and a signal of the first frequency is used to transmit predetermined instruction information. The low-frequency signal includes first information for connection to a network, and identification information of a group to which a device to which the low-frequency signal is transmitted belongs. The predetermined instruction information is transmitted to a device that has received the low-frequency signal, has registered the first information, and has connected to the network, and for which participation in the network has been approved.

Abstract: In a device network system, system recognition processing that identifies a device connected by a wired line is performed using a low-frequency signal of a frequency lower than a first frequency used in communication, and a signal of the first frequency is used to transmit predetermined instruction information. The low-frequency signal includes first information for connection to a network, and identification information of a group to which a device to which the low-frequency signal is transmitted belongs. The predetermined instruction information is transmitted to a device that has received the low-frequency signal, has registered the first information, and has connected to the network, and for which participation in the network has been approved.

Abstract: An air-conditioning apparatus includes a first transmission channel, a plurality of second transmission channels different from the first transmission channel, a controller connected to the first transmission channel and not connected to the second transmission channels, a plurality of air-conditioning indoor units connected to the second transmission channels and not connected to the first transmission channel, and a plurality of air-conditioning outdoor units. The plurality of air-conditioning outdoor units electrically connect the first transmission channel and the second transmission channels, and do not transmit a short-circuit state occurring in one of the first transmission channel and the second transmission channels to a transmission channel other than the one of the first transmission channel and the second transmission channels, thereby enabling communication between devices connected to the transmission channel other than the one.