Do you need a driver for this?

Hi,Yes, you can get the Driver installation from our wiki link: https://www.waveshare.com/wiki/USB_TO_RS485

Connecting to a conductivity system (analog eval-cn0359-eb1z) power led comes on, yet neither transceiver led. are drivers needed? can i test system?

Hi,please check this way: 1) Disconnect the connection with analog eval-cn0359-eb1z first, send data to the host computer, and check whether TXD is on. 2) Try to test another USB port . 3) Change to another host computer and check whether the TX or RX lights are normal.

I need this to control the “iot relay”, but since the usb ports are always powered, how can i control the on/off effect with this usb adapter?

This is a RS485 serial port adapter, the serial port is always on. If you have a RS485 relay module, the module will alway be on to, that module will control a relay, that it turns on and off by command over the RS485 serial connection.

Will this work with the usb 2.0 on an rpi 3b? currently, when i hook plug it in, the os finds the adapter but then crashes the rs485 bus.

Hi,it can work with the usb 2.0 on an rpi 3b. If it is crushed ,it can be caused by low electricity

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USB to RS485 Converter Industrial Adapter Original FT232RL and SP485EEN Fast Communication Embedded Protection Circuits Resettable Fuse ESD Protection

Product ID: 313980884

Details

Colour
FT232RL
Compatible devices
PC Industrial
Connector type
USB Type A
Item dimensions L x W x H
30 x 18 x 3
Specific uses for product
PC

⚡600W surge & lightning protection

📡1.2km RS485 transmission range

🔄921600bps ultra-fast baudrate

Description

⚙️ Power your industrial network with bulletproof speed and protection!

PLUG PLAY VERSATILITY - Supports all major OS including Linux, Android, Windows, and Mac—get up and running instantly without driver headaches.
UNMATCHED SURGE DEFENSE - Built-in TVS, resettable fuse, and protection diodes shield your setup from voltage spikes and electrostatic shocks.
REAL TIME STATUS FEEDBACK - Integrated LED indicators keep you informed on power, data transmission, and reception—never guess your connection status again.
INDUSTRIAL GRADE STABILITY - Original FT232RL & SP485EEN chips ensure rock-solid, lag-free communication for mission-critical control systems.
EXTENDED REACH CONNECTIVITY - Seamlessly transmit data up to 1.2km over RS485—perfect for sprawling industrial environments and multi-node networks.

The Waveshare USB to RS485 Industrial Adapter combines original FT232RL and SP485EEN chips to deliver ultra-fast, stable bidirectional communication up to 921600bps. Engineered for harsh environments, it features onboard 600W surge protection, resettable fuses, and ESD shielding to ensure reliable operation across 1.2km transmission distances. Compatible with Linux, Android, Windows, and Mac, this compact converter is the go-to solution for professional-grade industrial control and automation setups.

Specifications

ASIN	B081MB6PN2
Best Sellers Rank	#6,182 in Computers ( See Top 100 in Computers ) #11 in Serial Adapters
Brand	Waveshare
Color	FT232RL Version
Colour	FT232RL Version
Compatible Devices	PC, Industrial Control Equipment
Compatible devices	PC, Industrial Control Equipment
Connector Type	USB Type A
Connector type	USB Type A
Current Rating	0.2 Amps
Customer Reviews	4.6 out of 5 stars 449 Reviews
Finish	Matte
Input Voltage	5 Volts
Item Dimensions	30 x 18 x 3 millimeters
Item dimensions L x W x H	30 x 18 x 3 millimeters
Manufacturer	Waveshare
Mfr Part Number	Industrial USB to RS485 Converter
Model Number	Industrial USB to RS485 Converter
Number of Items	1
Number of Ports	1
Package Quantity	1
Power Plug Type	No Plug
Specific Uses For Product	PC
Specific uses for product	PC
UPC	750904070769 778365986825
Unit Count	1.0 Count
Warranty Type	Limited

Reviews

J**B

Great Modbus adapter

I have used these in two Raspberry Pi 3 projects. One is Modbus interface into a EG46000XP inverter for Solar Assistant and another for talking Modbus to a Tesla V2 wall charger W/ TWCmanager. They just worked out of the box with no effort. Used the included shield terminal to make connection to shield on cable for one end.

12.09.2026

M**R

Connects quickly and seems stable

I use it to connect on BACnet MS/TP devices and networks to change settings on job sites and it's very easy to use. Just make sure of your polarity! If reversed, nothing shows up. I use it with YABE, a free software and it's just perfect, I can see all the BACnet points and change everything I need without issues.

11.05.2022

と**ん

動作問題無し

問題なく動作しています。リピート予定です。

11.01.2026

R**S

Good service

Prompt service worked great

28.03.2026

M**S

Alta calidad y desempeño

Tecnología y calidad en los materiales . Me es muy util

1.01.2026

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