Industrial Isolated USB To 4-Ch RS485 Converter (B)

SKU: WS-26545 Brand: Waveshare

USB-to-RS485 converter with four isolated channels and built-in surge and ESD protection, for stable multi-OS communication in an aluminium alloy case.

Special Price $31.69 AUD, inc GST

Regular Price $40.82 AUD, inc GST

$28.81 AUD, exc GST

Special pricing ends 14 September 2025

* this special may end earlier than shown

Available with a lead time
Expect dispatch between Jun 30 and Jul 02

Expand your PC’s serial communications with a robust, quad-channel interface. The Industrial Isolated USB To 4-Ch RS485 Converter (B) delivers reliable, galvanically isolated RS485 links for Modbus networks, sensor arrays and motor control.

Featuring the high-performance CH344L USB controller, four independent isolated channels and full surge protection, it’s ideal for industrial automation, data logging and multi-node networks over distances up to 1.2 km.

Specifications

USB Interface: USB-B connector, 5 V bus-powered, 500 mA resettable fuse, CH344L chip
RS485 Channels: 4× isolated screw-terminal ports, hardware auto-direction control
Baud Rate: 1 200 – 460 800 bps
Isolation: Unibody power and digital isolation, no external PSU required
Surge & ESD Protection: Onboard TVS, self-recovery fuse, protection diodes, 600 W surge, 15 kV ESD
Termination: 120 Ω resistors per channel, DIP-switch enable/disable
Indicators: PWR (USB power), ACT (driver status), TXD/RXD per channel
Transmission Distance: Up to 1.2 km on RS485; ~5 m on USB
Operating Conditions: –40 °C to 85 °C, 5 %–95 % RH
OS Support: Windows 7/8/8.1/10/11, macOS, Linux, Android
Enclosure: Aluminium alloy case; wall-mount & DIN-rail support

How to Use

Mount the converter using the included rail-mount buckle or wall brackets.
Connect a USB Type A–Type B cable between your PC’s USB port and the converter’s USB-B socket.
Wire your RS485 devices to the four screw terminals; set 120 Ω termination switches on end-of-line nodes.
Install the CH344L driver on Windows (plug-and-play on macOS/Linux/Android); verify ACT LED lights green.
Power is drawn from USB—no extra supply needed; PWR LED confirms bus voltage.

Compatibility

Windows 7, 8, 8.1, 10 and 11
macOS and mainstream Linux distributions
Android devices with USB‐OTG support
Industrial RS485 devices: sensors, PLCs, motor drives
Modbus RTU networks (point-to-multipoint, up to 32 nodes)

Additional Resources

Waveshare USB To 4-Ch RS485 (B) Wiki

What’s Included

Industrial Isolated USB To 4-Ch RS485 Converter (B) × 1
Rail-mount buckle × 1
USB Type A to Type B cable (~1.2 m) × 1
Screwdriver × 1

This product is listed in:

Breakouts & Modules>RS485

Product Comments

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We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

$3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
$7+ for Standard Post (typically 6+ business days, tracked)
$11+ for Express Post (typically 2+ business days, tracked)
Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

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International Orders - the following rates are for New Zealand and will vary for other countries:

$12+ for Pack and Track (3+ days, tracked)
$16+ for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

40 Aruma Place
Cardiff
NSW, 2285
Australia

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