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Last modified by Theodore Xu on 2024/04/10 09:11
From version 30.1
edited by Leo Wei
on 2023/12/29 09:51
Change comment: Deleted image "1703814552069-173.png"
To version 32.1
edited by Theodore Xu
on 2024/01/16 17:06
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1 -XWiki.admin
1 +XWiki.AiXia
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1 -== [[image:1703814552069-173.png||height="402" width="739"]] ==
2 -
3 3  == **Modbus** ==
4 4  
5 5  **Communication specifications**
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27 27  
28 28  **RS485 Connection Topology**
29 29  
30 -RS485 bus connection topology is shown in the following figure. 485 bus is recommended to use shielded twisted pair (STP), 485+, 485-: Adopt twisted pair to connect; Only 120 Ω terminal matching resistors are connected at both ends of the bus to prevent signal reflection; All node 485 signal grounds are connected together; Connect 128 nodes at most, and the distance between branches of each node should be less than 3m.
28 +RS485 bus connection topology is shown in the following figure. 485 bus is recommended to use shielded twisted pair (STP), 485+, 485-: **Adopt twisted pair to connect**; Only 120 Ω terminal matching resistors are connected at both ends of the bus to prevent signal reflection; All node 485 signal grounds are connected together; Connect 128 nodes at most, and the distance between branches of each node should be less than 3m.
31 31  
32 32  **Multi-node connection mode**
33 33  
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53 53  
54 54  The maximum number of nodes and transmission distance supported by our standard RS485 circuit at different rates are shown in the following table.
55 55  
54 +The communication distance between the inverter and other devices should not exceed **200 meters**, if it exceeds two hundred meters it may cause unstable communication. If the communication distance **exceeds 200 meters**, the following measures need to be included:
55 +
56 +* **Adopt twisted pair to connect**
57 +* **anti-interference magnetic ring**
58 +
56 56  |Transmission distance (m)|Rate (kbps)|Number of nodes|Wire diameter
57 57  |100|115.2|128|AWG26
58 58  |1000|19.2|128|AWG26