UART Serial TTL To RS232 B User Guide

Overview

TTL TO RS232 (B) is an industrial-grade rail-mounted electrically isolated TTL-to-RS232 serial converter.

Feature

Compatible with TTL/RS232 standard, converting the TTL signal into a balanced differential RS232 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 with lightning-proof and ESD protection.
Onboard protection diodes, ensure the current/voltage stable outputs, provide over-current/over-voltage protection, and improve shock resistance.
Onboard power supply screw terminal for 3.3V~5V DC input.
Industrial rail-mount ABS case design, small in size, easy to install, and cost-effective.

Parameters

Model	Galvanic isolated TTL To RS232 converter
Power Port	Power supply	3.3V ~ 5V
Power Port	Interface Protection	Anti-over-discharge, reverse-proof
Device interface	Compatible with TTL / RS232 standard
TTL Interface	Interface	Screw terminal
	Transmission distance	Less than 10m
	Transmission model	Point to point
RS232 Interface	Interface	Screw terminal
	Protection	TVS diode protection, anti-surge and ESD protection, power and digital isolation
	Transmission Distance	About 15m
	Transmission Mode	Point-to-point
Indicator	PWR	Power indicator, lights up red when the input voltage is detected
	TXD	TX indicator, lights up when the TTL port sends data
	RXD	RX indicator, lights up when the TTL port receives data
Product Appearance	Case	Rail-mount ABS case, suitable for 35mm DIN rail
Product Appearance	Dimensions	91.6 × 58.7 × 23.3mm

Primary Function

Convert the TTL signal into RS232 signal, which can be used for interface conversion and can also be used to extend the communication distance.

Interface Introduction

TOP SIDE SCREW TERMINAL		BOTTOM SIDE SCREW TERMINAL
VCC	Power Input DC 3.3V~5V power supply	SGND	RS232 Signal Ground
GND	Ground / TTL signal ground	SGND	RS232 Signal Ground
TXD	TTL transmit data pin	TXD	RS232 transmit data pin
RXD	TTL receive data pin	RXD	RS232 receive data pin

Communication Connection Diagram

TTL convert to RS232, point-to-point, full-duplex communication, suitable for interface conversion

Two groups TTL To RS232 conversion, point-to-point, full-duplex communication, suitable for extending the communication distance of TTL

Dimensions

Hardware Test

Test Note

Test Environment: PC (Windows).
Accessories required for testing:

TTL TO RS232 (B) —— This product
USB TO TTL - not included
PC (if your PC does not feature the RS232 interface, you can choose USB to RS232 (female socket male pin) for adapter test)

Test Hardware Connection

Connect the RS232 interface of TTL TO RS232 (B) to the PC through the serial port cable or the USB to RS232 cable, connect the TTL interface of TTL TO RS232 (B) to the TTL interface of USB TO TTL, and then connect the USB port of USB TO TTL to the same PC for the self-transmission test. The schematic diagram of the hardware connection is as follows:

Software Operation

Open two SSCOM interfaces.
Select two corresponding COM ports.
Select the baud rate as 115200, input the characters to be sent, select "Show Time and Packet" to view it more intuitively, and then click on "Open COM".