Product Description:

This transparent transmission module realizes the conversion between TTL signal and RS485 signal, 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, but in turns; that is, each end of the communication channel can be a transmitter or a receiver, but at the same time, information can only be transmitted in one direction.

Module Highlights:

(1) 3.3V and 5.0V power supply
(2) 3.3V and 5.0V signal

(3) Anti-interference ability, while using a more effective 485 lightning protection design, 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 meters of 2*1.5 cables, it is recommended to use within 800 meters, and add a repeater if it exceeds 800 meters)

(4) Using a half-hole process design, the board thickness is 0.8mm, which can be easily used as a mother-and-child board, and can also be used for welding terminals

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

(6) Baud rate: 110~256000bps

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 "ground connection" end of the module to the ground can play a good role in anti-interference and lightning protection, making the 485 bus more stable; when transmitting over short distances indoors, it can be disconnected from the ground.

(2) Adopting the standard 2.54 spacing design, it is convenient for your secondary development

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

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

(5) This module can be hot-swapped, and the signal deadlock phenomenon that occurs when hot-swapping other 485 chips occurs

(6) Large area copper plating, signal interference