Point-to-point exchange and star compound topology network architecture based on RS485

Abstract

The utility model provides a kind of point-to-point exchange and star compound topological network architecture based on RS485, the architecture uses the mode of master-slave of RS485, host computer is connected through high-speed bus AXI4 or ethernet based on the exchange module (data_crossbar) or switch of RS485 address and port mapping exchange mode, switch can have 16 exchange RS485 ports at most, each port can carry out RS485 star topological network architecture layout or connect single terminal.The host computer of the utility model can access multiple terminals through RS485 simultaneously;The network of the utility model of point-to-point and star topological improves the reliability, stability and flexibility of bus.

Description

Technical Field

[0001] This utility model belongs to the field of communication technology, and in particular relates to a point-to-point switching and star-topology composite network architecture based on RS485. Background Technology

[0002] RS485 star topology is a common network cabling method, suitable for scenarios where devices are widely distributed. Its core feature is connecting multiple slave devices through a central node (such as an RS485 hub), thereby achieving centralized data management and transmission. However, this star network has the following fatal drawbacks:

[0003] 1. The impedance of the RS485 star differential network needs to be matched to 120 ohms, and each terminal needs to be able to operate normally. Once a terminal fails, it may occupy the bus indefinitely, which will have a destructive impact on the entire bus.

[0004] 2. Traditional RS485 star networks can only communicate one-to-one or via broadcast in a master-slave manner. If there are many nodes, since only one node can be accessed at a time, low-latency access to a large number of nodes cannot be guaranteed, and it is also impossible to access multiple nodes simultaneously. Summary of the Invention

[0005] In view of this, the present invention aims to overcome the shortcomings of the above-mentioned problems in the prior art and proposes a point-to-point switching and star-topology composite network architecture based on RS485.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0007] The point-to-point switching and star topology network architecture based on RS485 uses an RS485 master-slave configuration, including a host and a switching unit connected in sequence. The switching unit has multiple RS485 ports, and each RS485 port can be configured in an RS485 star topology network architecture or connected to a single RS485 terminal.

[0008] Furthermore, each of the RS485 ports is connected to the switching unit via a UART module.

[0009] Furthermore, the host is connected to a switching unit via a high-speed AXI4 bus or Ethernet.

[0010] Furthermore, the switching unit includes a switching module (data_crossbar) or a switch based on RS485 address and port mapping switching.

[0011] Furthermore, the switch includes 16 RS485 switching ports.

[0012] Furthermore, the host can simultaneously access multiple terminals via RS485.

[0013] Compared with existing technologies, the point-to-point switching and star-topology composite network architecture based on RS485 described in this utility model has the following advantages:

[0014] The host of this invention can access multiple terminals simultaneously via RS485; the point-to-point and star topology of this invention improves the reliability, stability and flexibility of the bus. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0016] Figure 1 This is a schematic diagram of a point-to-point switching and star-topology composite network architecture based on RS485 according to this utility model. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] like Figure 1 As shown, this utility model provides a network architecture based on RS485 point-to-point switching and star topology. This architecture combines the advantages of RS485 star topology bus and Ethernet point-to-point switching network. The architecture uses RS485 master-slave mode. The host is connected to a switching module (data_crossbar) or switch based on RS485 address and port mapping switching mode through a high-speed bus AXI4 or Ethernet. The switch can have up to 16 RS485 switching ports. Each port can be configured in an RS485 star topology network architecture or connect a single terminal.

[0022] Based on this architecture, the host can access up to 16 terminals simultaneously, and the number of simultaneous accesses depends on the number of ports on the RS485 switch.

[0023] When a host needs to access multiple terminals, it sends data from multiple terminals to an RS485 switch via a high-speed AXI4 bus or Ethernet. Each terminal's data packet header contains a mapped address. The switch extracts the address, routes the data to the destination port, and sends the data to the destination port almost simultaneously. When multiple terminals need to communicate with the host simultaneously, the terminals send data to the switch port. The switch aggregates the data and sends it to the host via the high-speed AXI4 bus or Ethernet.

[0024] Through the above architecture, this invention not only enables flexible terminal connections like an Ethernet switched network but also expands the number of terminals like a traditional RS485 star network, possessing the advantages of an RS485 star topology and greatly improving the flexibility of network terminal connections. The hybrid point-to-point and star topology architecture ensures that even if a single RS485 node fails, occupying the bus will not cause a devastating impact on the entire network; terminals on other ports of the switch can still communicate normally. This architecture can also support point-to-point topology networks, with the maximum number of point-to-point connections depending on the number of switch ports. When using a point-to-point topology, RS485 connections on the bus do not interfere with each other, and the host can access multiple nodes simultaneously, improving the reliability and stability of the RS485 bus and overcoming the limitation that RS485 cannot access multiple terminals simultaneously.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A point-to-point switching and star-topology hybrid network architecture based on RS485, characterized in that: The architecture uses an RS485 master-slave configuration, including a host and a switching unit connected in sequence. The switching unit has multiple RS485 ports, and each RS485 port can be configured as an RS485 star topology network or connected to a single RS485 terminal.

2. The point-to-point switching and star-topology composite network architecture based on RS485 according to claim 1, characterized in that: Each of the RS485 ports is connected to the switching unit via a UART module.

3. The point-to-point switching and star-topology composite network architecture based on RS485 according to claim 1, characterized in that: The host is connected to the switching unit via a high-speed AXI4 bus or Ethernet.

4. The point-to-point switching and star-topology composite network architecture based on RS485 according to claim 1, characterized in that: The switching unit includes a switching module (data_crossbar) or a switch based on RS485 address and port mapping switching.

5. The point-to-point switching and star-topology composite network architecture based on RS485 according to claim 4, characterized in that: The switch includes 16 RS485 ports.

6. The point-to-point switching and star-topology composite network architecture based on RS485 according to claim 1, characterized in that: The host can access multiple terminals simultaneously via RS485.

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