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

⚡921600bps max baudrate

📡1.2km RS485 transmission

🛡️15KV ESD & surge protection

126.90 DT

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Industrial-grade speed and protection that keeps your control systems ahead of the curve!

STATUS AT A GLANCE - 3 bright LEDs for instant power and data flow feedback.
BULLETPROOF PROTECTION - Built-in 15KV ESD, surge suppressors, and resettable fuse safeguard your setup.
LONG HAUL CONNECTIVITY - Reliable RS485 transmission over 1.2km keeps your network seamless.
PLUG PLAY VERSATILITY - Supports Windows, Linux, Android, Mac — no driver headaches.
BLAZING FAST ROCK SOLID - Up to 921600bps for ultra-responsive industrial communication.

The Waveshare USB to RS485 Converter features original FT232RL and SP485EEN chips delivering stable, bidirectional communication at speeds up to 921600bps. Designed for industrial environments, it supports transmission distances up to 1.2km with robust onboard protections including 15KV ESD, surge suppression, and resettable fuses. Compatible across major OS platforms, it ensures reliable, plug-and-play connectivity with clear LED status indicators.

Specifications

ASIN	B081MB6PN2
Best Sellers Rank	#3,297 in Computers ( See Top 100 in Computers ) #4 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 (450)
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
Specific Uses For Product	PC
UPC	750904070769 778365986825
Unit Count	1.0 Count
Warranty Type	Limited

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126.90 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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