TTL to RS485 Galvanic Isolated Converter

WaveshareSKU: WAV-23778
Sale price £11.60
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This TTL To RS485 converter converts the TTL (Time to Live) signal into a differential RS485 (for serial communication) signal for interface converting, expanding nodes, and long-distance communication. Using the RICE features (Relay, Isolate, Convert, and Expand) it does the following - 

  • Relay - Communication distance of up to 1.2km
  • Isolate - Power and signal isolation
  • Convert - TTL to RS485 bi-directional conversion
  • Expand - RS485 can be expanded up to 32 nodes

It has multiple protection features to make it safe and stable, including isolated voltage, strong anti-interference, lightning-proof diodes and a TVS (Transient Voltage Suppressor) that acts as a diversion of power when there are surges or spikes that could damage equipment downstream.

On top of that, it also comes with rail mount support, so you can easily combine multi-rail-mounted serial servers together. This is one converter you don't want to miss out on!

We also have a TTL to RS422 converter, and you can find it here

For those who are unaware of the difference, the RS422 can have up to 10 transmitter receiver pairs present on the line at one time, whereas the RS485 can have up to 32.


  • Compatible with TTL/RS485 standard, converting the TTL signal into differential RS485 signal, supports half-duplex communication
  • Compatible with 3.3V ~ 5V TTL signal level, provides anti-reverse and over-voltage protection for power supply interface
  • Onboard unibody power supply isolation, provides stable isolated voltage and needs no extra power supply for the isolated terminal
  • Onboard unibody digital isolation, allows signal isolation, high reliability, strong anti-interference, low power consumption
  • Onboard TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit, lightning-proof & anti
  • electrostatic
  • Onboard resettable fuse and protection diodes, ensure the current/voltage stable outputs, provide over-current/over-voltage protection, improve shock
  • resistance
  • Onboard RS485 output terminal 120R resistor, enabled/disabled via a switch
  • Industrial rail-mount ABS case design, small in size, easy to install, and cost-effective

What's on Board


Power Supply Interface Power supply 3.3V ~ 5V
Protection Over-voltage, reverse-proof
Device Port TTL/RS485 standard compatible
TTL Connector Screw terminal
Transmission distance About 10m
Transmission mode Point-to-point
RS485 Connector Screw terminal
Protection 600W lightning-proof and surge-suppress, 15KV ESD protection
Terminal resistor 120R, enabled/disabled via switch
Transmission Distance About 1.2km
Transmission Mode Point-to-multipoint (up to 32 nodes, it is recommended to use repeaters for 16 nodes or more)
Appearance Case Rail-mount ABS case, suitable for 35mm DIN rail
Dimensions 91.6 × 58.7 × 23.3mm



VCC Power Input

DC 3.3V~5V power supply
DIP SWITCH 120R enable switch
GND Ground SGND RS485 signal ground
TXD TTL transmit data pin A+ RS485 differential signal positive
RXD TTL receive data pin B- RS485 differential signal negative

Package Contents

  • 1x TTL To RS485 Converter (B)
  • 1x Screwdriver 

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