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Product description: TTL to RS485 converter with galvanic isolation - Waveshare 27479
The TTL to RS485 Converter (C) is a compact, professional module designed to convert TTL signals (3.3V/5V) to a differential RS485 signal , enabling stable communication over long distances. It was designed for industrial applications, automation, measurement systems, and embedded projects , where reliability, interference immunity, and secure transmission are key. The module features full galvanic isolation of the power supply and signals , effectively protecting host devices from surges, ground loops, and electromagnetic interference. Built-in protection features, such as TVS, protective diodes, and a self-resetting fuse , ensure stable operation even in harsh environmental conditions. Thanks to its castellated edge pins and ENIG (immersion gold) finish, the converter is easy to integrate directly onto PCBs .
TTL to RS485 converter with galvanic isolation - Waveshare 27479. 
The TTL to RS485 Converter (C) is a compact, professional module designed to convert TTL signals (3.3V/5V) to a differential RS485 signal.Special features
- TTL to RS485 signal conversion (half-duplex)
- Compatible with TTL levels from 3.3V to 5V
- Galvanic isolation of power supply and signals - high immunity to interference
- Built-in security:
- TVS surge and antistatic
- ESD protection up to 6 kV
- overvoltage and overcurrent protection
- self-resetting fuse
- Supports point-to-point and point-to-multipoint communication
- Integrated 120 Ω terminating resistor (activated by solder jumper)
- Compact dimensions and castellated through holes for easy installation
- LEDs indicating power and TX/RX transmission
Practical applications
The TTL to RS485 (C) converter is ideal for projects requiring reliable long-distance communication, such as industrial automation systems, sensor networks, measurement systems, PLCs, BMS systems, and IoT solutions. Thanks to its galvanic isolation, it is particularly recommended for installations susceptible to interference, ground potential differences, and electrostatic discharge.
Technical specifications of the converter
- Power supply: DC 3.3 V to 5 V
- TTL levels: 3.3V/5V
- Communication mode: half-duplex
- Standards: TTL / RS485
- TTL transmission:
- range: < 10 m
- mode: point-to-point
- RS485 transmission:
- range: up to approx. 1.2 km
- mode: point-to-multipoint (up to 32 nodes, repeaters above 16 recommended)
- RS485 security:
- 200 W surge protection
- ESD protection up to 6 kV
- Terminating resistor: 120 Ω (jumper)
- Isolation: power and signals (built-in)
- Interfaces: TTL (RXD, TXD), RS485 (A+, B-, PE)
- LED indicators: PWR, TXD, RXD
- Dimensions: 42.8 x 15.2 x 4.75 mm
Contents of the set
- 1x TTL to RS485 (C) converter with galvanic isolation
Thanks to castellated through-holes and ENIG (immersion gold) finish, the converter is easy to integrate directly into PCBs. Useful links |
