One-to-many current loop communication method and communication device
A technology of current loop communication and current loop communication, which is applied in the field of current loop communication, can solve the problems of high construction specification requirements, poor anti-interference, bus paralysis, etc., and achieve the effects of backward and forward compatibility, low construction requirements, and low cost
Active Publication Date: 2017-04-12
QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD +1
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Problems solved by technology
However, this communication method also has some shortcomings, that is, poor anti-interference, technically differential drive and construction requirements for carrier shielding, and high requirements for construction specifications, any abnormality can lead to bus paralysis
Method used
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Embodiment Construction
[0050] The technical solutions of the present invention will be further described below through specific embodiments.
[0051] figure 2 It is a schematic structural diagram of a one-to-many current loop communication hardware circuit provided by Embodiment 1 of the present invention. like figure 2 As shown, the hardware circuit in this embodiment includes an outdoor unit system 10 and two indoor unit systems, namely the first indoor unit system 20 and the second indoor unit system 30 . The outdoor unit system 10 is connected to the first indoor unit system 20 through a bus, and is connected to the second indoor unit system 30 through a bus. Each indoor unit system is connected in parallel, and the indoor unit system and outdoor unit system are connected in series. Multiple indoor unit systems and outdoor unit systems together form a current loop communication circuit. The outdoor unit system 10 can communicate with two indoor unit systems through a bus. Of course, the nu...
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The invention discloses a one-to-many current loop communication method and a communication device. The one-to-many current loop communication method comprises the following steps: an outdoor unit system transmits data to all indoor unit systems simultaneously through a current loop communication circuit, and specifies a reply indoor unit system; the specified reply indoor unit system transmits data to the outdoor unit system through the current loop communication circuit, and unspecified indoor unit systems enter dormant states and wake up autonomously at a next communication cycle when the outdoor unit system re-enters transmission according to a timing sequence requirement; communication between each indoor unit system and the outdoor unit system is realized through time-sharing polling. By adopting the one-to-many current loop communication method disclosed by the invention, low construction requirement can be kept, front and back compatibility is realized, and one-to-many expansion can be realized.
Description
technical field [0001] The present invention relates to the field of current loop communication, and more specifically, to a one-to-many current loop communication method and a communication device. Background technique [0002] Currently, for simple one-to-one communication, current loops are usually used. The characteristic of the current loop is that it can be identified by the presence or absence of current on the communication circuit, has good anti-interference performance, has low construction requirements, does not require shielding, and does not even require isolation from current-carrying power lines. However, this communication method also has some disadvantages, that is, the number of communication is limited, usually one-to-one, and the communication speed is low. [0003] Complex one-to-many communication, usually using a bus. The characteristic of the bus is that the current on the bus is very small, and it is identified by voltage. The advantage is that the...
Claims
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IPC IPC(8): F24F11/00
Inventor 魏延培陈鹏
Owner QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD