TTL to RS422 Galvanic Isolated Converter

This TTL To RS422 converter converts a TTL signal into a balanced differential RS422 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 RS422 bi-directional conversion
• Expand – RS422 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!

Note: the TTL TO RS422 is designed to be used with RS422 devices, however, you can use it with RS485 devices (But you only have the option to send). It is recommended to use TTL TO RS485 (B) for the RS485 device.

Features

• Compatible with TTL/RS422 standard, converting the TTL signal into differential RS422 signal, supporting full duplex communication
• Compatible with 3.3V ~ 5V TTL signal level, provides anti-reverse and over-voltage protection for power supply interface
• Unibody power supply isolation, provides stable isolated voltage and needs no extra power supply for the isolated terminal
• Unibody digital isolation, allows signal isolation, high reliability, strong anti-interference, low power consumption
• TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit, anti-electrostatic
• Resettable fuse and protection diodes, ensure the current/voltage stable outputs, provide over-current/over-voltage protection, improve shock resistance
• RS422 input and output terminal 120R resistor, enabled/disabled via jumper
• 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/RS422 standard compatible
TTL	Connector	Screw terminal
	Transmission distance	About 10m
	Transmission mode	Point-to-point
RS422	Connector	Screw terminal
	Protection	Surge-suppress and 15KV ESD protection
	Terminal resistor	120R, enabled/disabled via jumper (inside the case)
	Transmission Distance	About 1.2km
	Transmission Mode	Full duplex mode, point-to-multipoint (up to 256 nodes, it is recommended to use repeaters for 16 nodes or more)
APPEARANCE	Case	Rail-mount ABS case, suitable for 35mm DIN rail
	Dimensions	106.0 × 58.6 × 36.0mm

Resources

• Product Wiki

Pinout

TOP SIDE SCREW TERMINAL		BOTTOM SIDE SCREW TERMINAL
VCC	Power Input	R+	RS422 differential signal receive positive
	DC 3.3V~5V power supply
GND	Ground	R-	RS422 differential signal receive negative
TXD	TTL transmit data pin	T-	RS422 differential signal transmit negative
			RS485 differential signal negative (B-)*
RXD	TTL receive data pin	T+	RS422 differential signal transmit positive
			RS485 differential signal positive (A+)*
GND	TTL signal ground	GND	RS485/422 signal ground

Package Contents

• 1x TTL to RS422 Converter (B)
• 1x Screwdriver