MAX485 chip is a low power consumption for RS-485 communication, draw between 120µA and 500µA of, limit the slew rate transceiver to allow serial communication over very long cable runs (up 4000 feet / 1200 meters). The 5.08 (mm) pitch 2P terminal, convenient RS-485 communication wiring.Chip leads all pins can be controlled through the microcontroller. RS485 transceiver module Serial data can be transmitted in both directions (half duplex) at a data rate up to 2.5Mbps. It is possible to connect multiple modules together for communication between 2 or more devices（up to 32）. For even greater distances two modules can be configured as a repeater. RS-485 module applicable to Low-Power RS-485 Transceivers, Low-Power RS-422 Transceivers, Level Translators, Transceivers for EMI-Sensitive Applications, Industrial-Control Local Area Networks. Supply current when unloaded or fully loaded with disabled drivers. Data connections to the modules are provided by a standard 0.1"""" pitch header pins which can also be soldered into standard prototyping PCB and breadboards. Screw terminals provide convention connection to the actual data cable. Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit. Specifications :
Working Voltage : 5V
Main Chip : MAX485
Speeds: up to 2.5Mbit/Sec
Distances: up to 1200 meters

Multi-drop supports: up to 32 devices on same bus
Uses differential signaling for noise immunity
On board 5.08(mm) 2P connector for RS 485 wires
All the pins of the chip are brought out, can be controlled by MCU

PIN :
VCC : 5V
A : Non-inverting receiver input and no-ninverting driver output
B : Inverting receiver input and inverting driver output
GND : 0V
R0 : Receiver output (to rx pin of micro controller)
RE : Receiver output enable (low to enable)
DE : Driver output enable (high to enable)
DI : Driver input (to Tx pin of micro controller)

Package includes:
12 x MAX485 TTL to RS-485 interface module