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

Waveshare 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 lightning & surge protection

📡1.2km RS485 transmission range

🔄921600bps ultra-fast bidirectional data

€ 40.06

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Power your industrial network with bulletproof speed & protection!

PLUG PLAY VERSATILITY - Supports Linux, Android, Windows (XP to 11), and WinCE for effortless integration across platforms.
UNMATCHED SURGE DEFENSE - Built-in TVS, resettable fuse & ESD protection shield your setup from voltage spikes and electrostatic shocks.
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.
REAL TIME STATUS MONITORING - Triple LED indicators keep you instantly informed on power, data send, and receive activity—no guesswork.

The Waveshare USB to RS485 Converter leverages original FT232RL and SP485EEN chips to deliver ultra-fast, stable bidirectional communication up to 921600bps. Designed for industrial control, it features robust onboard protections including 600W lightning-proof surge suppression, resettable fuses, and 15KV ESD defense. Supporting multiple OS platforms and offering transmission distances up to 1.2km, this compact adapter ensures reliable, long-range connectivity with real-time LED status indicators for seamless monitoring.

Specifications

ASIN	B081MB6PN2
Best Sellers Rank	#8,591 in Computers ( See Top 100 in Computers ) #10 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 437 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
Smart Home Compatibility	Not Smart Home Compatible
Specific Uses For Product	PC
Specific uses for product	PC
UPC	750904070769 778365986825
Unit Count	1.0 Count
Warranty Type	Limited

Reviews

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

E**Y

Works flawlessly and super inexpensive. What more can you ask for.

10.04.2026

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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€ 40.06

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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