MAX485 TTL to RS-485
KSh 150.00
The MAX485 TTL to RS-485 Module is a high-speed transceiver designed to allow microcontrollers (like Arduino, ESP32, or STM32) to communicate over long distances using the RS-485 protocol. It converts low-voltage TTL logic signals into differential signals that are highly resistant to electromagnetic interference.
Technical Specifications
• Operating Voltage: 5V DC
• On-board Chip: MAX485ESA (Low power, slew-rate-limited transceiver)
• Communication Protocol: Half-Duplex (Can send or receive, but not both simultaneously)
• Maximum Data Rate: 2.5 text{ Mbps}
• Maximum Bus Distance: Up to 1200text{ meters} (at lower baud rates)
• Terminal Pitch: 5.08text{mm} 2-pin terminal block for easy RS-485 bus wiring
• Pin Spacing: Standard 2.54text{mm} (0.1″) headers for breadboard compatibility
• Node Capacity: Supports up to 32 transceivers on a single bus
• Current Consumption: Low power consumption (approx. 300mu A quiescent)
• Differential Input Threshold: 200text{mV}
Pin Definitions
The module typically features two sides: the TTL (Microcontroller) Side and the RS-485 (Bus) Side.
Microcontroller Side
• VCC: 5V Power Supply
• GND: Ground
• RO (Receiver Output): Connects to the MCU’s RX pin.
• DI (Driver Input): Connects to the MCU’s TX pin.
• RE (Receiver Enable): Active Low. Connect to GND to always receive.
• DE (Driver Enable): Active High. Connect to 5V to always transmit.
• Note: RE and DE are often tied together and toggled by a single GPIO pin to switch between Send and Receive modes.
RS-485 Bus Side
• A: Non-inverting Receiver Input and Non-inverting Driver Output.
• B: Inverting Receiver Input and Inverting Driver Output.
Key Performance Highlights
• Differential Signaling: Uses two wires (A and B) to transmit data. Because it measures the voltage difference between the wires rather than the voltage relative to ground, it is exceptionally immune to noise.
• Half-Duplex Operation: Since it uses the same two wires for talking and listening, you must manage the RE/DE pins in your code to prevent data collisions.
• Daisy-Chainable: Perfect for industrial sensor networks where multiple devices need to report back to a single master controller over a long cable run.
You must be logged in to post a review.
Related products
Products
-
20mm EC11 Rotary Encoder
KSh 140.00
-
6 pin (3 state ) rocker switch 6A 250V
KSh 100.00
-
MAX485 TTL to RS-485
KSh 150.00
-
Ball head 16mm Self-resenting Switch button
KSh 200.00
-
ESP8266MOD ESP12E
KSh 1,000.00
Reviews
There are no reviews yet.