MAX13487 TTL to RS485 Converter Module - 5V Automatic Two-Way Communication

The module operates from a single 5V DC power supply. Its TTL logic inputs are 5V tolerant and are generally compatible with 3.3V logic outputs from modern microcontrollers, as the high-level input threshold is typically below 3.3V. For reliable operation with 3.3V systems, ensure the microcontroller's GPIO can drive the input pins to a valid high logic level.

The module contains internal logic that automatically controls the driver enable (DE) and receiver enable (RE) pins of the MAX13487 IC based on the state of the TTL transmit line. This eliminates the need for dedicated microcontroller GPIO pins to manage the direction, simplifying your code to standard serial transmit and receive operations only.

While dependent on cable quality and network configuration, the MAX13487 IC supports data rates up to 250kbps. For reliable communication, standard RS-485 guidelines apply: using twisted-pair cable with proper termination, distances of up to 1200 meters are achievable at lower baud rates, with shorter distances recommended for higher speeds.

Yes, this module is designed for multi-drop (bus) networks. You can connect multiple modules (and other RS-485 devices) to the same A and B differential pair lines. Ensure the network is properly terminated with a 120-ohm resistor at each end of the bus to prevent signal reflections.