USB-TO-RS232-485 User Guide

Overview

USB TO RS232/485 is a USB to RS232/485 non-isolated serial port converter, featuring the original FT232RNL chip for improved stability and compatibility. It comes with a built-in self-recovering fuse, TVS protection circuit, etc. USB TO RS232/485 offers simple operation, zero-delay automatic transmission and reception conversion, and boasts characteristics such as fast, stable, reliable and safe communication.

Features

Onboard Original FT232RNL chip. Fast communication, stable and reliable, better compatibility.
Onboard TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic.
Onboard self-recovery fuse and protection diodes, ensure the current/voltage stable outputs, provide over-current/over-voltage proof, and improve shockproof performance.
Onboard RS232/485 communication switching circuit, configured by switch.
Onboard 120R terminal resistor on the RS485 interface, enabled/disabled via switch.
3x LEDs for indicating the power and transceiver status.
ABS case design, small in size, easy to use, portable and cost-effective.

Parameters

Model	USB to RS232/RS485
Host Interface	USB
Device Interface	RS232/RS485
USB Interface	Operating Level	5V
	Interface	Type-A male
	Protection	200mA self-recovery fuse
	Transmission Distance	About 5m
RS232 Interface	Interface	Screw Terminal
	Transmission Distance	About 15m
	Transmission Mode	Point to Point
	Baud Rate	300 bps ~ 921600bps
RS485 Interface	Interface	Screw Terminal
	Direction Control	Hardware automatic control
	Protection	Provide TVS diode protection, anti-surge, and ESD protection (onboard 120R resistor)
	Transmission Distance	About 1200m (at low rate)
	Transmission Mode	Point to multi-point (up to 32 nodes, add the relay for up to 16 nodes)
	Baudrate	300 bps ~ 921600bps
Indicator	PWR	Red power indicator, connect to USB, light on when the voltage is detected
	TXD	Transmitting indicator, green light is on when data is sent from the USB interface
	RXD	Receiving indicator, blue light is on when the data is sent back from the device interface
Usage Environment	Temperature Range	-15℃ ~ 70℃
Usage Environment	Humidity Range	5% ~ 95%RH
OS	Mac, Linux, Android, Windows 11 / 10 / 8.1 / 8 / 7

Onboard Interface

Dimensions

Driver Installation

USB Driver Installation

Download the VCP Driver.
Double click on CDM212364_Setup.exe and install it.
Click on Extract, and then "NEXT".

Click on I accept this agreement, and then click on "NEXT", and click on "Finish".

After connecting the PC, you can see the usable COM port number in the device manager.

Hardware Test

Test environment: PC (Windows)
Required accessories:

USB TO RS232/485 x 2pcs
USB-A male-to-female cable x 1 (or directly connect to the USB port of the computer)
Wires

RS232 Test

Connect the RS232 interface of the USB TO RS232/485 module to the RS232 interface, that is, RXD and TXD are connected in a staggered manner, GND and GND are connected, and the toggle switch on top of the module is switched to RS232, and the connection diagram is referenced as follows:

Open two SSCOM windows and the corresponding COM port numbers.

Select the baud rate as 115200, input the characters to be sent, check show time and package, and click on Open COM:

Set the two SSCOM windows sending at 100ms intervals, and then you can see the 2 Windows send and receive data normally, the effect as shown below:

RS485 Test

Connect the RS485 connector of the USB TO RS232/485 module, that is, A+ --> A+, B- --> B-, GND --> GND, and switch the toggle switch on it to RS485, the connection diagram is referenced below: