Item specifics
Description
TTL TO RS485 (C) Product Overview
The TTL TO RS485 (C) is a galvanically isolated TTL to RS485 serial converter module from Waveshare. TTL TO RS485 (C) is compatible with TTL/RS485 standards, converting TTL signals into balanced differential RS485 signals with half-duplex communication. Featuring a stamp-hole gold-plated process, the module measures only 42.8×15.2×4.75mm for easy embedded integration. With onboard unibody power isolation and unibody digital isolation, TTL TO RS485 (C) provides dual isolation of power and signals, offering high reliability, strong anti-interference capability, and low power consumption. Built-in TVS (Transient Voltage Suppressor), resettable fuse, and protection diodes effectively suppress surge voltages and transient spikes, providing lightning, ESD, overcurrent, and overvoltage protection. TTL TO RS485 (C) is widely used in industrial automation, data acquisition, instrumentation, smart home, and IoT applications requiring long-distance, high-reliability serial communication.
TTL TO RS485 (C) Key Features
Dual Galvanic Isolation: The TTL TO RS485 (C) features unibody power isolation and unibody digital isolation for dual isolation of power and signals. The isolated side requires no additional power supply, providing stable isolated voltage and effectively isolating electrical interference between the TTL and RS485 sides.
Wide Voltage Compatibility: TTL TO RS485 (C) is compatible with 3.3V ~ 5V TTL signal levels with overvoltage protection on the power supply side. It can directly connect to 3.3V systems (STM32, ESP32) and 5V systems (Arduino, 51 MCU) without level shifting.
Multi-Layer Hardware Protection: Onboard TVS (Transient Voltage Suppressor) effectively suppresses surge voltages and transient spikes, providing lightning and ESD protection; onboard resettable fuse and protection diodes ensure stable current and voltage output with overcurrent and overvoltage protection; RS485 interface provides 200W lightning, surge, and 6KV ESD protection.
Flexible Termination Resistor: Onboard RS485 120Ω termination resistor can be enabled via soldering for flexible configuration. It can be easily enabled at bus terminal nodes for long-distance communication to suppress signal reflections.
Long-Distance Communication & Multi-Drop Networking: The RS485 side supports point-to-multipoint transmission with up to 32 nodes (repeaters recommended for 16+ nodes). RS485 communication distance reaches up to 1200 meters, with TTL side distance under 10 meters.
Ultra-Compact Stamp-Hole Design: TTL TO RS485 (C) features a stamp-hole gold-plated process with dimensions of only 42.8×15.2×4.75mm, enabling easy embedded integration into various product applications.
Complete Status LEDs: Onboard three LED indicators including PWR power indicator, RXD receive indicator (lights when data is received from the TTL interface), and TXD transmit indicator (lights when data is received from the RS485 interface).
TTL TO RS485 (C) Application
TTL TO RS485 (C) is used in industrial serial communication, PLC signal conversion, long‑distance sensor data acquisition, embedded system signal isolation, MCU serial port extension, anti‑interference industrial control communication, instrument serial networking, automation control projects.
TTL TO RS485 (C) Advantages and Highlights
Dual Power & Signal Isolation for Strong Anti-Interference: The TTL TO RS485 (C) features unibody power isolation and digital isolation, providing stable isolated voltage without additional power for the isolated side. Dual isolation effectively prevents common-ground interference and surge impacts, ensuring stable operation in complex industrial electromagnetic environments.
Multi-Layer Protection for Safety and Reliability: Built-in TVS, resettable fuse, protection diodes, and 200W lightning/surge protection effectively suppress surge voltages, transient spikes, and ESD, providing comprehensive protection for downstream equipment.
3.3V/5V Wide Voltage Compatibility, Plug-and-Play: Compatible with 3.3V ~ 5V TTL signal levels for direct connection to both 3.3V and 5V systems without level shifters.
Ultra-Compact Stamp-Hole Design for Easy Integration: Stamp-hole gold-plated process with dimensions of only 42.8×15.2×4.75mm allows direct soldering onto PCBs like SMD components.
1200m Long-Distance Communication, 32-Node Networking: RS485 communication distance up to 1200 meters with support for up to 32 nodes in point-to-multipoint mode.
120Ω Termination Resistor for Flexible Configuration: Onboard 120Ω termination resistor can be enabled via soldering for impedance matching in long-distance or bus terminal applications.
Why Choose QIXINWEI
Years of experience in the electronics industry. Trusted by global customers.
Massive In-Stock Inventory – Ready to ship promptly
BOM Matching Service – One-stop solution, save time
PCBA Customization – Professional engineering team creates tailor-made solutions based on your needs
Cost-Effective & Efficient – Better channel, better cost
A dedicated team makes your procurement smoother.
Contact us for BOM quotes or PCBA inquiries
FAQs:
Question: What is the primary function of this module?
Answer: TTL TO RS485 (C) is a galvanic isolated converter that transforms 3.3V-5V TTL signals into differential RS485 signals, supporting half-duplex communication.
Question: What are the advantages over standard non-isolated modules?
Answer: The core advantage of TTL TO RS485 (C) lies in the onboard power isolation and digital isolation, which effectively blocks ground loop interference and significantly improves communication stability in industrial environments.
Question: What is the supply voltage?
Answer: TTL TO RS485 (C) operates on a DC 3.3V to 5V power supply and includes over-voltage protection for the interface.
Question: What protective measures are included?
Answer: TTL TO RS485 (C) features TVS diodes for surge suppression, lightning and static protection, offering 200W lightning-proof and 6KV ESD protection.
Question: What is the RS485 transmission distance and node capacity?
Answer: TTL TO RS485 (C) supports point-to-multipoint communication with a theoretical max distance of approximately 1200 meters and up to 32 nodes (repeaters recommended for 16+ nodes).
Question: How is the onboard 120R resistor enabled?
Answer: TTL TO RS485 (C)'s resistor can be enabled via a 'solder jumper' configuration, typically used as a line termination resistor.
Question: What are the pin definitions for wiring?
Answer: For TTL TO RS485 (C), left side pins are PE, B-, A+ (RS485 side); Right side pins are GND, RXD, TXD, VCC (TTL side).
Question: What are the physical dimensions and finish?
Answer: TTL TO RS485 (C) measures 42.8mm x 15.2mm x 4.75mm and features a black immersion gold finish with castellated holes for easy integration.
Question: What are typical applications?
Answer: TTL TO RS485 (C) is ideal for industrial automation with inverter interference, data acquisition systems, IoT gateways, and scenarios requiring long-distance or high-reliability serial communication.
Question: What do the indicator lights mean?
Answer: TTL TO RS485 (C) has three LEDs: PWR (Power), TXD (Transmit Data), and RXD (Receive Data) for real-time communication status monitoring.