JPH0636634B2 - Control signal transmission system for thermal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a main station such as a plurality of outdoor units and a slave station such as a plurality of indoor units in a heat device such as an air conditioner and a water heater. The present invention relates to a control signal transmission method for thermal equipment that transmits data via one transmission path.

<Prior Art> Conventionally, as an air conditioner having a plurality of slave stations such as indoor units, for example, there is one as shown in FIG. (JP-A-62-37627). In this air conditioner, four air conditioners (air conditioners) 11 to 14 as slave stations are connected to transmission lines 17 via interfaces 21 to 24, respectively.
And each of the air conditioners 1 on the transmission line 17
Centralized controller 15 as a main station for controlling 1 to 14
And the outside air temperature detecting device 16 for detecting the outside air temperature via the interfaces 25 and 26, respectively, and the room temperature detecting devices 31 to 34 for detecting the room temperature of the room in which the air conditioners 11 to 14 are installed, respectively. Are connected. Then, the centralized controller 15 sequentially polls the air conditioners 11 to 14 to compare the outside air temperature detected by the outside air temperature detecting device 16 with the room temperature detected by the room temperature detecting devices 31 to 34 to compare the air conditioners 11 to 14 with each other. Are trying to control.

<Problems to be Solved by the Invention> By the way, in the above conventional air conditioner,
The centralized controller 15 sequentially polls the four air conditioners 11 to 14, which are slave stations, so that one master station controls four slave stations. However, in this polling method, for example, when a plurality of master stations provided at different locations control a plurality of slave stations, respectively, in order to avoid data interference, the plurality of master stations are selectively selected. Therefore, there is a problem that the device becomes complicated and the cost becomes high.

Therefore, an object of the present invention is to connect a plurality of master stations and a plurality of slave stations through one transmission line, and to transmit and receive data between the plurality of master stations and a plurality of slave stations. It is to provide a control signal transmission system for thermal equipment that can transmit and receive data without selectively switching the main station.

<Means for Solving the Problem> In order to achieve the above object, the control signal transmission system for thermal equipment of the present invention is configured such that a plurality of master stations and a plurality of slave stations are connected by one transmission path, and a plurality of master stations are connected. , In order of the master station's address, data with the slave station address and its own address are sequentially transmitted to the slave station to which the command is to be sent, and the transmission path is open for a predetermined time after the slave station receives the data transmitted by the master station. In this case, each slave station sequentially transmits the master station address added to the data received by each slave station and the data with its own address in order of the slave station address.

<Operation> From multiple master stations, in order of the master station's address, the slave station desiring to send a command sequentially transmits the data with the slave station address and its own address, and the slave station receives the data transmitted by the master station. After that, when the transmission line becomes free for a predetermined time, each slave station sequentially transmits the master station address added to the data received by each slave station and the data with its own address in the order of the slave station address. Therefore, the switching means for selectively switching the plurality of master stations is not required, and the data can be transmitted and received between the plurality of master stations and the plurality of slave stations.

<Example> Hereinafter, the present invention will be described in detail with reference to illustrated examples.

In FIG. 1, 1 to 3 are main stations that are outdoor units of the air conditioning apparatus, 4 to 7 are slave stations that are indoor units of the air conditioning apparatus,
Reference numeral 8 is a transmission line that connects the master stations 1 to 3 and the slave stations 1 to 4 to each other.

When transmitting data from the master stations 1 to 3 to the slave stations 1 to 4, the master station 1 becomes the main and controls the timing of transmission. Then, as shown in FIG. 2 (A), first, the master station 1 sends the command to the slave stations (in this case, slave station 1 with address 1 and slave station 2 with address 2) that it wants to send a command, and the slave station address and self-address. After sequentially transmitting the data with the address, the timing signal 1 is subsequently transmitted. When the master station 2 receives the timing signal 1, the slave station wants to send a command after T1 time (in this case, slave station 2).
, The data with the slave address and its own address is transmitted, and then the timing signal 2 is transmitted.
Next, when the master station 3 receives the timing signal 2, the T
A slave station to send a command after 1 hour (in this case, address 4
To the slave station 4), the data with the slave station address and its own address is transmitted, and then the timing signal 3 is transmitted.

After the slave station receives the timing signal 1 transmitted by the master station 1, when a vacancy of T2 time (T2> T1) occurs in the transmission line 8, the slave station starts data transmission in the address order of the slave station. In FIG. 2 (A), there is no T2 time vacancy in the transmission path 8 until the master station 1 transmits the timing signal 1 and the master station 3 transmits the timing signal 3, so the slave station transmits data. Do not start. Then, as shown in FIG. 2 (B), when the slave station receives the timing signal 3 and a vacancy of T2 time occurs in the transmission path 8, data transmission is started. In this case, each slave station transmits the master station address added to the data received by each slave station and the data with its own address, in the order of the slave station address. Now, ACKin (i = 1
˜3, n = 1 to 4), and the data transmitted by the slave station n that has not received a command from any master station is NAKn (n = 1 to 4). Since the slave station 1 received the command only from the master station 1, "A
CK11 "is transmitted. Since the slave station 2 has received the command from the master station 1 and the master station 2," ACK12 "and" ACK2 "are sent.
2 "is sequentially transmitted to the slave station 1. Next, since the slave station 3 has not received a command from any master station," NA "is transmitted.
Since the slave station 4 has received the command from the master station 3, the slave station 4 transmits "ACK34".

After the master station 1 receives the data transmitted by the slave station, when the transmission path 8 has a vacancy for T3 time, the master station 1 starts transmission. In FIG. 2 (B), the slave station 1 uses the data "ACK1".
Since the transmission line 8 has no vacancy for T3 time from the transmission of "1" to the transmission of the data "ACK34" by the slave station 4, the master station 1 does not start data transmission.
As shown in the figure (C), the main station 1 sends the data "ACK3"
The master station 1 starts transmission when a vacancy of T3 time occurs on the transmission line 8 after receiving 4 ". In Fig. 2 (C), there is no command given to any slave station. The master stations 1, 2 and 3 respectively transmit only the timing signals 1, 2 and 3. Therefore, the slave stations 1, 2, 3 and 4 respectively indicate that they have not received a command from any master station. Signal "NA
K1 ”,“ NAK2 ”,“ NAK3 ”, and“ NAK4 ”are returned.

In this way, the master stations 1, 2 and 3 sequentially transmit the slave station to which a command is to be sent to the slave station to which the command is to be sent, the data with the slave station address and its own address, and the subsequent timing signal. When the transmission line becomes free for a predetermined time after receiving the timing signal transmitted by the master station 1, each slave station assigns the master station address and its own address attached to the data received by each slave station in the order of the slave station address. Since the transmitted data is transmitted sequentially, the main stations 1, 2, 3
It is possible to perform data transmission / reception between the master stations 1, 2, 3 and the slave stations 1, 2, 3, 4 without requiring a switching means for selectively switching.

<Effects of the Invention> As is apparent from the above, the control signal transmission system for thermal equipment of the present invention connects a plurality of master stations and a plurality of slave stations by one transmission path, and from a plurality of master stations to the master station. In the order of the address of, when the slave station to which the command is to be transmitted sequentially transmits the data with the slave station address and its own address, and when the slave station receives the data transmitted by the master station, and the transmission path becomes free for a predetermined time, Since each slave station sequentially transmits the master station address added to the data received by each slave station and the data with its own address in order of the slave station's address, in order to selectively switch multiple master stations It is possible to perform data transmission / reception between a plurality of master stations and a plurality of slave stations without the need for the switching means.

[Brief description of drawings]

FIG. 1 is a connection diagram for explaining an embodiment of a control signal transmission system for heat equipment of the present invention, FIG. 2 is a diagram for explaining a data transmission order in the above embodiment, and FIG. It is a connection diagram of the conventional air conditioning apparatus consisting of a station and a plurality of slave stations. 1-3 ... Master station, 4-7 ... Slave station, 8 ... Transmission line.

Claims (1)

[Claims] 1. A plurality of master stations and a plurality of slave stations are connected by one transmission line, and the slave station address and its own address are sent from the plurality of master stations to a slave station to which a command is to be sent in the order of the master station address. If the transmission path becomes available for a predetermined time after the slave station receives the data transmitted by the master station, each slave station is added to the data received by that slave station in the address order of that slave station. A control signal transmission system for thermal equipment, characterized in that the data with the master station address and its own address are transmitted sequentially.