Quick Start; Port Connection; Rs485 Connection - Ebyte E851-RTU Series User Manual

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Chengdu Ebyte Electronic Technology Co., Ltd.

1 Quick Start

This chapter is a quick introduction to the E851-RTU (4440-ETH) series products. It is recommended that users systematically

read this chapter and follow the instructions to have a systematic understanding of the module products. Users can also choose what

you are interested in according to their needs. chapters to read. For specific details and instructions, refer to subsequent chapters.

Note: When the 485 bus high-frequency signal is transmitted, the signal wavelength is shorter than the transmission line, and the

signal will form a reflected wave at the end of the transmission line, which will interfere with the original signal. Therefore, it is

necessary to add a terminal resistor at the end of the transmission line so that the signal does not reflect after reaching the end of the

transmission line. The terminal resistance should be the same as the impedance of the communication cable, the typical value is 120

ohms. Its function is to match the bus impedance and improve the anti-interference and reliability of data communication.

E851-RTU(4440-ETH) User Manual

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