MAX485 Interface Module

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  • MAX485 TTL to RS-485 Interface Module
  • This low power transceiver module is based on the Maxim MAX485 IC to allow serial communication over very long cable runs (up 4000 feet / 1200 meters).
  • Serial data can be transmitted in both directions (half duplex) at a data rate up to 2.5Mbps.
  • The modules operate from a standard 5V power.
  • Uses differential signaling for noise immunity
  • Distances up to 1200 meters
  • Speeds up to 2.5Mbit/Sec
  • Multi-drop supports up to 32 devices on same bus
  • Red power LED


  • The MAX485 TTL to RS-485 Interface Module allows MCUs to use the RS-485 differential signaling for robust long distance serial communications.
  • RS-485 provides for robust serial communications over long distances of up to 1200 meters (4000′) or in electrically noisy environments and is commonly used in industrial environments. It supports up to 2.5MBit/Sec data rates, but as distance goes up, the maximum data rate that can be supported comes down.
  • You can think of RS-485 as RS232 on steroids. The data starts out as typical TTL level serial as far as the microcontroller is concerned while the RS-485 module takes care of converting the electrical signals between TTL and the differential signaling used by RS-485.
  • The module has two 4-pin headers on the assembly.  The headers are spaced 1.6″ apart, so if using with solderless breadboards, it is necessary to bridge two different breadboards.1 x 4 Header (Data side)
    • RO  =  Receiver Output.  Connects to a serial RX pin on the microcontroller
    • RE  =  Receiver Enable.  Active LOW.  Connects to a digital output pin on a microcontroller. Drive LOW to enable receiver, HIGH to enable Driver
    • DE  =   Driver Enable.  Active  HIGH.  Typically jumpered to RE Pin.
    • DI  =   Driver Input.  Connects to serial TX pin on the microcontroller

    1 x 4 Header (Output side)

    • VCC =  5V
    • B      =  Data ‘B’ Inverted Line. Common with the B
    • A      =  Data ‘A’ Non-Inverted Line.  Connects to A on far end module
    • GND =  Ground

    1 x 2 Screw Terminal Block (Output side)

    • B      = Data ‘B’ Inverted Line. Connects to B on far end module
    • A      = Data ‘A’ Non-Inverted Line.  Connects to A on far end module