TTL TO RS422 (B)

Half-Duplex RS485

Full-Duplex RS422 RS485, TTL

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Primary Attribute Category: {{{userDefinedInfo}}}: {{{userdefinedvalue}}} Brand: Waveshare

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Onboard Interfaces

Related Products

Overview

TTL TO RS422 (B) is an industrial-grade rail-mounted electrically isolated TTL-to-RS485 serial converter.

Feature

• Compatible with TTL/RS485 standard, converting the TTL signal into a balanced differential RS485 signal, supporting full-duplex communication.
• Compatible with 3.3V ~ 5V TTL signal level, with anti-reverse connection and anti-over-voltage circuit on the power supply side.
• 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, and low power consumption.
• Onboard TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit and is anti-electrostatic.
• Onboard resettable fuse and protection diodes, ensure the current/voltage stable outputs, provide over-current/over-voltage protection, and improve shock resistance.
• On-board RS485 input and output 120R resistors with built-in jumper caps for switching enable.
• Industrial rail-mount ABS case design, small in size, easy to install, and cost-effective.

Parameters

Model	Galvanic isolated TTL to RS422 converter
Power Port	Power Supply	3.3V ~ 5V
	Interface Protection	anti-over-discharge, reverse-proof
Device Interface	Compatible with TTL / RS485 standard
TTL Interface	Interface Type	Screw terminal
	Transmission Distance	less than 10m
	Transmission Model	Point to point
RS422 Interface	Interface type	Screw terminal
	Interface Protection	Provide 600W lightningproof, surge-suppress and 15KV ESD protection
	Terminal Resistance	120R, enabled/disabled via jumper (inside the case)
	Transmission Distance	About 1200m
	Transmission Mode	Point-to-multipoint (Up to 32 nodes can be connected, and relays are recommended for more than 16 nodes)
Product Appearance	Case	Rail-mount ABS case, suitable for 35mm DIN rail
	Dimensions	91.6 × 58.7 × 23.3mm

Basic Function

Convert TTL signal to balanced differential RS422 signal, which can be used for interface conversion, and node expansion, and can also be used to extend the communication distance.

Interface Introduction

* Note: the TTL TO RS422 (B) is designed to be used with RS422 devices, however, it is also possible to be used with RS485 devices (yet only sending is available). It is recommended to use TTL TO RS485 (B).

Communication Connection Diagram

TTL convert to RS422, point to point, full duplex communication, suitable for interface conversion

TTL convert to RS422, point-to-multipoint, full duplex communication, suitable for expanding nodes

Two groups TTL to RS422 conversion, point-to-point, full duplex communication, suitable for extending the communication distance of TTL

Dimensions