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

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 max baudrate

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Description

🚀 Power your industrial network with bulletproof speed & protection!

PLUG PLAY VERSATILITY - Seamlessly compatible with Linux, Android, Windows (XP to 11), and Mac—future-proof your multi-platform workflows.
UNMATCHED SURGE DEFENSE - Onboard TVS, resettable fuse & protection diodes deliver 600W lightning-proof and 15KV ESD protection—your gear’s personal bodyguard.
REAL TIME STATUS FEEDBACK - Triple LED indicators keep you instantly informed on power, data send, and receive status—no guesswork, just control.
INDUSTRIAL GRADE STABILITY - Original FT232RL & SP485EEN chips ensure rock-solid, high-speed communication for mission-critical setups.
EXTENDED REACH CONNECTIVITY - Supports RS485 transmission up to 1.2km, perfect for sprawling industrial networks without signal loss.

The Waveshare USB to RS485 Converter is an industrial-grade adapter featuring original FT232RL and SP485EEN chips for ultra-stable, bidirectional communication. It boasts a lightning-proof 600W surge protector, 15KV ESD defense, and a resettable fuse to safeguard your devices. With transmission speeds up to 921600bps and distances reaching 1.2km, it supports multi-node RS485 networks and is compatible across major operating systems. Ideal for industrial control and high-demand communication environments, it offers real-time LED status indicators and comes with essential accessories for quick deployment.

Specifications

ASIN	B081MB6PN2
Best Sellers Rank	#6,127 in Computers ( See Top 100 in Computers ) #12 in Serial Adapters
Brand	Waveshare
Color	FT232RL Version
Compatible Devices	PC, Industrial Control Equipment
Connector Type	USB Type A
Current Rating	0.2 Amps
Customer Reviews	4.6 4.6 out of 5 stars (434)
Finish	Matte
Input Voltage	5 Volts
Item Dimensions	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
UPC	750904070769 778365986825
Unit Count	1.0 Count
Warranty Type	Limited

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$20.23

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In stock

Sold byAmazon USADelivered 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 USA.

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TrustScore 4.5 | 7,300+ reviews

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