The Waveshare TTL to RS485 (C) is a compact, high-reliability module that converts TTL-level signals (3.3V or 5V) to RS485 differential signals with full galvanic isolation. Designed for industrial and embedded applications, it ensures robust communication over long distances while protecting connected devices from electrical surges and interference.
Pinout Overview
Right Side (TTL Interface):
- VCC: Power Input (3.3V ~ 5V DC)
- TXD: TTL Transmit Data
- RXD: TTL Receive Data
- GND: Ground / TTL Signal Ground
Left Side (RS485 Interface):
- A+: RS485 Differential Signal Positive
- B-: RS485 Differential Signal Negative
- PE: RS485 Signal Ground
Features
Applications
- Industrial automation and control systems
- RS485 sensor networks and data acquisition systems
- Long-distance UART communication
- Embedded systems requiring robust serial communication
Specification
| Parameter | Value |
|---|---|
| Input Voltage | 3.3V ~ 5V DC |
| TTL Transmission Distance | Less than 10 meters |
| RS485 Transmission Distance | Approximately 1.2 kilometers |
| Communication Mode | TTL: Point-to-Point; RS485: Point-to-Multipoint (up to 32 nodes; recommend repeaters for 16+ nodes) |
| Protection Features | 200W lightning-proof, 6KV ESD protection, over-voltage, over-current, surge suppression |
| Terminal Resistor | 120Ω (enabled via soldering) |
| Indicators | PWR (Power), T (TXD), R (RXD) LEDs |
| Dimensions | 42.8 x 15.2 x 4.75 mm |
| Weight | 3 grams |
