The MAX485 module is a low-power, slew-rate-limited transceiver used for RS-485 communication. It is the gold standard for connecting microcontrollers (Arduino, ESP32, STM32) to industrial equipment, sensors, and PLCs that speak the MODBUS protocol. By using a differential signal (A and B lines), this module naturally cancels out electromagnetic noise, making it immune to interference from high-power motors and fluorescent lighting.
Long-Distance Reliable Data: Transmit serial data over twisted-pair cables up to 1.2 kilometers.
Multi-Drop Support: Connect up to 32 transceivers on a single bus (perfect for daisy-chaining sensors).
High Noise Immunity: Differential signaling ensures your data stays clean even in high-EMI industrial environments.
Easy TTL Integration: Connects directly to any 5V microcontrollers UART (RX/TX) pins.
Compact Design: Small footprint, easy to mount in control cabinets or junction boxes.
| Feature | Specification |
| Operating Voltage | 5V DC |
| Interface | TTL (Serial) to RS-485 |
| Protocol | Half-Duplex (requires DE/RE pin control) |
| Data Rate | Up to 2.5 Mbps |
| Bus Capability | 32 nodes on the bus |
| Distance | Up to 1,200 meters (depending on cable quality) |
| Dimensions | 44mm x 14mm |
Distance: Standard UART fails after a few meters; RS-485 goes for over a kilometer.
Safety: Differential signaling protects your microcontroller from common-mode voltage spikes.
Standards: If you are working with industrial sensors (pH meters, flow meters, PLCs), they almost always use RS-485/MODBUS.
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