Description:-

The module is fully consider the 485 mine design and anti-jamming design, in the field for long distance transmission, it will block the "earthed" side to earth, can play the role of a good anti-jamming and lightning protection, make 485 more secure; you can not connect with the earth indoor short-distance transmission. Using a standard 2.54 pitch design for easy secondary development. Having a 120 ohm termination resistors that shorted R0 to enable matching resistor, when long-distance transmission is recommended shorting. Support multi-machine communication, allowing access at up to 128 devices on the bus. The module can be hot-swappable, hot-swap does not appear dead bolt phenomenon that occurs to other 485 chips. A large area of copper to prevent signal interference.

Features:-

• 3.3V perfectly compatible with 5.0V power supply
  
• 3.3V and 5.0V signal perfectly compatible
  
• Working temperature range: -40 ℃ to + 85 ℃
  
• Transmission distance up to kilometres (with 850 meters of 2 * 1.5 cable to do the test, it is recommended to use in the 800 meters, more than 800 meters, please add repeaters)
  
• Semi-hole process design, the thickness of 0.8mm, makes it easy to use as a combo board, it can also be welded terminal use
  
• Has RXD, and TXD signal lights to observe the send and receive status