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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⚡ Power up your industrial communication with bulletproof speed and protection!

EXTENDED REACH - Seamlessly transmit data up to 1.2km with stable 300-921600bps speeds—perfect for complex industrial setups.
REAL TIME STATUS LE DS - Three intuitive LEDs keep you instantly informed on power and data transmission status.
PLUG PLAY VERSATILITY - Compatible across Linux, Android, Windows (XP to 11), and Mac—future-proof your connectivity.
INDUSTRIAL GRADE STABILITY - Original FT232RL & SP485EEN chips ensure ultra-reliable, lightning-proof communication.
ROBUST PROTECTION CIRCUITRY - Onboard TVS, resettable fuse & ESD protection safeguard your equipment from voltage spikes and shocks.

This Industrial USB to RS485 Converter by Waveshare features original FT232RL and SP485EEN chips for fast, stable bidirectional communication. It supports transmission distances up to 1.2km at speeds up to 921600bps, with comprehensive onboard protections including 600W surge suppression, resettable fuse, and 15KV ESD defense. Compatible with multiple operating systems and equipped with real-time LED indicators, it’s engineered for demanding industrial environments requiring reliable, long-distance data transfer.

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Manufacturer	Waveshare
Part number	Industrial USB to RS485 Converter
Item Weight	80 g
Product Dimensions	5.28 x 2.29 x 0.69 cm; 80 g
Item model number	Industrial USB to RS485 Converter
Colour	FT232RL Version
Finish	Matte
Wattage	600 watts
Item Package Quantity	1
Specific uses	PC
Batteries included?	No
Batteries Required?	No

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

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