Ebyte E831-RTU Series, Руководство пользователя

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Chengdu Ebyte Electronic Technology Co.,Ltd. E831-RTU(8080T-485) User
Manual
4
Copyright ©2012–2022
，
Chengdu Ebyte Electronic Technology Co.,Ltd.
Features
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Support 8 -channel digital isolation input, default dry contact;

8 -channel digital output (NPN transistor open-collector output ) adopts Modbus RTU protocol data processing;

Support command reset. After power-on, after sending AT+RESTORE\r\n command to the 485 serial port , the Modbus device
address , RS485 serial port baud rate and parity bit will be restored to factory settings;

Support pulse counting, which can be configured as rising edge counting, falling edge counting, and level counting.

Hardware watchdog with high reliability;

Multiple indicator lights show the working status;
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The power supply has good overcurrent, overvoltage, anti-reverse connection and other functions;

Wide voltage input 8V-28V , 12V or 24V is recommended .

Customizable functions, such as conditional control (determining how to output according to the input state).
1 Quick Start
This chapter is a quick introduction to the E831-RTU (8080T-485) series products. It is recommended that users read this chapter
systematically and follow the instructions to have a systematic understanding of the module products. Interesting chapters to read.
Refer to subsequent chapters for specific details and instructions.
1.1 Port connection
1.1.1 RS485 connection
Note: When the
485 bus high-frequency signal is transmitted, the signal wavelength is shorter than that of 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, so it
is necessary to add a terminal resistance 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, 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.