Product description：
SCM ttl turn rs485 module 485 turn serial port uart interchange hardware automatic flow control
Receiving and distributing " controls are not required， using this module is as simple as you do with the serial port
Module bright spots：
（1） 3.3v Perfect compatibility with 5.0 v power supply
（2） 3.3v Perfectly compatible with 5.0 v signal
（3） Absolute use of original imported chips， industrial design， super interference resistance， simultaneously adopt more effective 485 lightning protection design， available in harsh industrial sites and in the wild， working temperature is -40 ° C to + 85 ° C， transmission distance up to kilometres (Testing of 2 * 1.5 cables used for 850 m， recommended for use within 800 metres， repeaters over 800 m)
（4） Design with semi hole process， slab thickness 0.8 mm， easy to use as a child motherboard， welding terminals are also available
（5） with rxd、 txd signal indicator， the receipt and issuance situation is well understood
Modular features：
（1） This module takes fully into account the design of 485 bus lightning protection and anti jamming design， long range transport in the field， connect the land connected " the module to the land， it can play a good role in anti jamming and lightning protection， make the 485 bus more secure; Land is not connected to indoor short distance transport.
（2） Adopt standard 2.54 spacing design， convenient for your second development
（3） 120 EMR， a short r0 enables matching resistance， short connections are recommended for long distance transport.
（4） Support for multiple communications， allow access to the bus of up to 128 devices
（5） This module can be heat interpolated， no signal embolization in other 485 chips
（6） Large area of copper， prevention of signal interference