The USB to 2-Port Isolated RS485 Converter is a robust, industrial-grade communication interface designed to seamlessly connect your PC or embedded system to multiple RS485 devices through a single USB port. Built with high-quality components and advanced isolation technology, this converter ensures reliable, interference-free data transmission in demanding industrial and commercial environments.
Dual Independent RS485 Ports
This converter features two fully independent RS485 channels, allowing you to simultaneously connect and communicate with multiple RS485 devices or networks from a single USB interface. Each port operates separately, supporting multi-drop RS485 networks with up to 32 devices per port (or more with repeaters). Two individual serial ports are created in Windows Device Manager.
USB Plug & Play Convenience
Powered directly via USB, the converter eliminates the need for external power supplies. It supports standard USB 2.0 (backward compatible with USB 1.1 and also 3.0), ensuring easy integration into modern and legacy systems. Drivers are available for Windows, Linux, and macOS, with native support for most operating systems.
3kV Galvanic Isolation
Each RS485 port is fully isolated from the USB host and from each other using 3kV galvanic isolation, providing crucial protection against voltage spikes, ground loops, and industrial noise. This isolation not only safeguards your equipment but also improves communication stability in electrically harsh environments.
Automatic Direction Control
Forget about managing RTS lines. This converter uses automatic data flow control to detect data transmission and seamlessly switch between send and receive modes—making it ideal for Modbus RTU and other half-duplex communication protocols.
Rugged & Reliable Design
Encased in a durable metal or industrial-grade ABS housing (depending on model), the converter is built to withstand industrial environments. It features TVS surge protection, static discharge protection (ESD), and overcurrent protection on all signal lines.
High-Speed, Error-Free Communication
- Baud Rate: Up to 1 Mbps
- Support for 8 data bits, 1/2 stop bits, even/odd/none parity
- Compatible with major SCADA and HMI software
- Stable performance with long-distance RS485 cables (up to 1200 meters under ideal conditions)
Applications
- Industrial automation and PLC communication
- Building management and HVAC systems
- Energy monitoring systems (smart meters, inverters)
- Medical equipment and laboratory instruments
- Security and access control systems
- Serial debugging and protocol analysis
Overall features
- Industrial grade
- Two RS485 ports
- Standard 35mm DIN rail mount and screw mount
- Port powered from USB port
- Fully isolated
- Built-in electrostatic protection
- Screw terminal block
- WHQL compliant COM drivers included
- Auto detection of data speed
- USB cable included
Resources
| SPECIFICATIONS |
| Part number |
27646 |
| Operating system |
- Windows 11, 10, 8.1, 8 (32/64-bit), Windows Server 2016, Windows Server 2012 / R2, Windows 7 (32/64-bit), Windows Server 2008 R2, Vista (32/64-bit), Windows Server 2008 (32/64-bit), XP, Windows Server 2003 (32/64-bit), 2000, (all WHQL compliant). Windows RT as D2XX drivers only.
- Windows CE v4.2 - 5.2, 6.0, 7.0 and 2013 including: Windows Mobile 2003, 2003 SE, Windows Mobile 5, 6, 6.1 and 6.5
- Linux (built into kernel 3.0.0-19 and above)
- Mac OS 8, OS 9, OS X 10.3 to 10.9 and above (since 10.9 the drivers are included in the kernel).
- Android 4.2
|
| Processor |
FT2232HL |
| Power |
5VDC provided by USB port |
| Serial interface |
Screw terminal block |
| RS485 |
2 wire half duplex |
| Compatible with |
Modbus RTU/ASCII, BACnet |
| Bias resistors |
Yes |
| Installation method |
35mm standard DIN rail or screws |
| USB interface |
Standard Type B Female |
| Indication LEDs |
Power, Send and Receive |
| Signals |
RS485: D+, D-, GND |
| Baud rate |
300 to 921600bps |
| Parity |
None, Odd, Even, Mark, Space |
| Data Bits |
5, 6, 7, 8 |
| Stop Bits |
1, 1.5, 2 |
| Flow Control |
Hardware automatic control |
| COM port accessible by |
Included virtual COM port drivers |
| Isolation |
700V continuous and 3500V spike
200mA self-recovery fuse (USB) |
| Electrostatic (ESD) protection |
15KV/ 600W/ms high voltage protection |
| Current draw |
Static: less than 80mA. Dynamic average: less than 150mA |
| Dimensions |
81.9 × 54.0 × 32.0 mm |
| Interface compliance |
USB1.1,2.0,3.0, EIA/TIA RS-232 |
| Regulatory compliance |
FCC, CE and RoHS |
| Operating temp |
-15°C to 70°C |
| Warranty |
1 year limited warranty |
Why Choose This Converter?
✅ Dual RS485 Ports = Fewer Adapters
✅ Industrial Isolation = Maximum Uptime
✅ Cross-Platform Support = Easy Integration
✅ Compact, Durable Design = Flexible Deployment
✅ Fast & Stable Communication = Trusted in Automation
