MCU TTL to RS485 module 485 to serial port UART level conversion hardware automatic flow control

Link: https://pan.baidu.com/s/1zR7xZZrQ98q3Y1DI99oHWw
Extraction code: 1234

MCU TTL to RS485 module 485 to serial port UART level conversion hardware automatic flow control

  RS485 automatic flow control module compatible with 3.3V and 5.0V power supply and signal

No need for "receive-send" control, using this module is as easy as operating a serial port

This transparent transmission module realizes the conversion between TTL signals and RS485 signals, but everyone must know that 485 is half-duplex communication. This communication method can realize two-way communication, but it cannot be carried out in two directions at the same time, and must be carried out alternately; that is to say, each end of the communication channel can be the sending end or the receiving end, but at the same time, information can only have one transmission direction.

Baud rate: support 110~128000bps 

Module highlights:

(1) Wide power supply range: 3.3V~5.5V

(2) 3.3V and 5.0V signal compatible

(3) Industrial-grade design, strong anti-interference ability, and more effective 485 lightning protection design. It can be used in industrial sites and harsh outdoor environments. The operating temperature is -40℃ to +85℃, and the transmission distance can reach kilometers (tested with 850-meter 2*1.5 cable. It is recommended to use it within 800 meters. If it exceeds 800 meters, please add a repeater)

(4) It adopts half-hole process design, with a board thickness of 0.8mm, which can be easily used as a mother-child board, and can also be used by welding terminals

(5) With RXD and TXD signal indicator lights, you can see the sending and receiving status at a glance

Module features:

(1) This module fully considers the lightning protection design and anti-interference design of the 485 bus. When transmitting over long distances in the wild, connecting the "grounding" end of the module to the ground can play a good role in anti-interference and lightning protection, making the 485 bus safer; when transmitting over short distances indoors, it does not need to be connected to the ground.

(2) Adopting the standard 2.54 pitch design to facilitate your secondary development

(3) It has a 120 ohm matching resistor. Shorting R0 can enable the matching resistor. It is recommended to short-circuit it for long-distance transmission.

(4) Supports multi-machine communication and allows connection to a bus with up to 128 devices

(5) This module can be hot-swapped, and will not cause the signal deadlock phenomenon that occurs when other 485 chips are hot-swapped.

(6) Large area copper plating to prevent signal interference