TTL to RS485 Galvanic Isolated Converter

This TTL to RS485 converter converts the TTL signal into a differential RS485 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.

Features

• 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

Specifications

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

Resources

• Product Wiki

Pinout

TOP SIDE SCREW TERMINAL		BOTTOM SIDE SCREW TERMINAL
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