Microcontroller to RS-485 circuit

RS-485 bus can carry up to 256 transceiver modules and
over long distances
This is a circuit for connect microcontroller with Rs-485 bus

Max485
Max485 are low-power transceivers for RS-485 and RS-
422 communication. Each part contains one driver and one
receiver.
Line Length vs. Data Rate
The RS-485/RS-422 standard covers line lengths up to
4000 feet. For line lengths greater than 4000 feet, see
Typical Applications
The MAX481, MAX483, MAX485, MAX487–MAX491, and
MAX1487 transceivers are designed for bidirectional data
communications on multipoint bus transmission lines.

Features
- In μMAX Package: Smallest 8-Pin SO
- Slew-Rate Limited for Error-Free Data Transmission
- 0.1μA Low-Current Shutdown Mode
- Low Quiescent Current
- -7V to +12V Common-Mode Input Voltage Range
- Three-State Outputs
- 30ns Propagation Delays, 5ns Skew
- Full-Duplex and Half-Duplex Versions Available
- Operate from a Single 5V Supply
- Allows up to 128 Transceivers on the Bus
- Current- Limiting and Thermal Shutdown for Driver Overload

Datasheet