📦 อุปกรณ์ในแพ็กเกจ
โมดูล TTL to RS485 จำนวน 1 ชิ้น
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TTL to RS485 / RS485 to TTL UART Converter Module | Automatic Direction Control | 3.3V / 5V
📌 Product Description
A bidirectional TTL UART ↔ RS485 converter module for connecting microcontrollers and compatible controllers to long-distance RS485 networks.
Automatic direction control switches between transmitting and receiving without manual DE/RE control. Suitable for IoT projects and industrial communication systems.
⚙️ Key Features
● Converts TTL UART signals to RS485 and vice versa.
● Supports 3.3V and 5V operation.
● Automatic transmit/receive direction control.
● Communication distance: Up to approximately 1km; 800m or less is recommended.
● Built-in noise and surge protection circuitry.
● TX / RX status LEDs.
● Supports multiple devices on a shared RS485 bus.
🔧 Technical Specifications
● Type: TTL UART to RS485 Converter
● Supply voltage: 3.3–5V
● Logic levels: 3.3V / 5V compatible
● UART interface: TXD, RXD
● RS485 interface: A+, B− differential signals
● Maximum communication distance: Approximately 1,000m, depending on cable and environmental conditions
● Supported devices: Up to approximately 128 nodes
● Onboard termination resistor: 120Ω
● Operating temperature: -40°C to +85°C
🔌 Pinout
TTL Side — Microcontroller Interface
● VCC: Power supply
● GND: Ground
● TXD: Transmit data
● RXD: Receive data
RS485 Side
● A+: Positive differential signal
● B−: Negative differential signal
● GND: Ground
📦 Package Includes
● 1 × TTL to RS485 Converter Module