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2.2 Device connection
2.2.1 RS485 connection
[Note] When the RS485 bus high-frequency signal is transmitted, the signal wavelength is shorter than the transmission
line, and the signal will form a reflection wave at the end of the transmission line, which will interfere with the original
signal. Therefore, a terminal resistance must be added at the end of the transmission line to prevent the signal from
reflecting after reaching the end of the transmission line. The terminal resistance should be the same as the impedance of
the communication cable, with a typical value of 120 ohms. Its function is to match the bus impedance and improve the
anti-interference and reliability of data communication.
2.2.2 Analog input connection
