HP-USB/232/485/TTL is an industrial-grade, isolated USB-to-serial converter that supports RS232, RS485, and TTL (UART) in one compact device. Built with an original FT232RL chipset and layered protection (isolated power + magnetic isolation + TVS), it delivers fast, stable, and safer communication for demanding automation and test environments.
| Multi-interface in one device | One converter covers RS232, RS485, and TTL-UART needs. |
|---|---|
| Stable high-speed communication | Original FT232RL delivers strong compatibility and reliable performance. |
| Isolated & safer wiring | Built-in isolation helps reduce ground-loop risk and improves system robustness. |
| Anti-interference design | Magnetic isolation and protection circuits help maintain stable links in noisy sites. |
| Zero-delay auto direction control (RS485) | Automatic TX/RX switching improves usability and efficiency. |
| Industrial protection built-in | TVS + fuse + protection diode help defend against surges, ESD, and miswiring. |
| Easy status monitoring | Power/TX/RX LEDs simplify troubleshooting during commissioning. |
| Rugged enclosure | Aluminum CNC housing improves durability for industrial applications. |
3-in-1 interface support: USB to RS232 / RS485 / TTL(UART)
Original FT232RL: high compatibility, stable high-speed communication
Built-in isolated power: isolated side works without external power supply
ADI magnetic isolation: strong anti-interference, high reliability, low power consumption
TVS surge & ESD protection: helps suppress transient spikes, lightning surges, and static discharge
Resettable fuse + protection diode: improves over-current/over-voltage resistance and impact tolerance
Zero-delay auto TX/RX switching: fast and stable data transfer, interfaces do not interfere with each other
Aluminum alloy CNC enclosure: anodized matte finish, durable for industrial sites
3 LED indicators: quick status check for power / TX / RX
Quality connectors: smooth insertion, robust and reliable
This isolated communication converter is designed for high-reliability serial communication between a host computer (USB) and industrial devices using RS485 / RS232 / TTL-UART. It is ideal for field debugging, PLC/SCADA connectivity, industrial data collection, and laboratory test benches where noise immunity and protection matter.
PLC / SCADA / HMI serial communication and commissioning
RS485 fieldbus and Modbus RTU device connection (meters, controllers, IO modules)
CNC machines, robotics, motor drives, and industrial gateways
Lab instruments and production test rigs requiring stable serial links
Building automation, traffic systems, and engineering monitoring networks
Embedded development and debugging (TTL-UART serial console)
Works with devices providing RS485 / RS232 / TTL-UART serial outputs/inputs
Suitable for common serial protocols such as Modbus RTU (device-side protocol depends on your equipment)
TTL-UART port supports TXD / RXD / GND for embedded boards and UART sensors/controllers
Product type: Industrial isolated communication converter
Host interface: USB
Device interfaces: RS485 / RS232 / TTL(UART)
USB standard: USB 2.0 high-speed
Communication rate: 300–921600 bps (supports up to 3 Mbps)
USB cable distance: ~5 m
Power level: 5V (USB side)
Interface form (USB): USB Type-B (square)
USB protection: 500 mA resettable fuse, isolated output
RS485
Connector: Terminal block
Pins: A+ / B- / GND
Direction control: Hardware auto-detect & auto-control
Protection: Common-mode 600W lightning; differential-mode 15kV ESD; optional 120Ω termination
Distance: ~1200 m
Topology: Point-to-multipoint (up to 32 nodes; repeater recommended for >16 nodes)
RS232
Connector: DB9 male
Protection: TVS surge & ESD protection
Distance: ~15 m
Topology: Point-to-point
TTL (UART)
Logic level: 3.3V
Connector: Terminal block
Pins: TXD / RXD / GND
Topology: Point-to-point
LED Indicators
PWR: USB power present
TX: Sending indicator
RX: Receiving indicator
Environmental
Operating temperature: -15°C to 70°C
Humidity: 5%RH–95%RH
OS support: Windows 10/8.1/8/7/XP/98; Windows CE 4.2/5.0/6.0; Linux 2.4+; Android (version dependent)
Q1: Does it require an external power supply for the isolated side?
No. It has built-in isolated power, so the isolated output can work without extra power.
Q2: Can it connect Modbus RTU devices?
Yes—use the RS485 interface and configure baud rate/parity based on your Modbus device requirements.
Q3: How do I wire RS485?
Connect A+ to A, B- to B, and GND if your system requires a reference ground. Enable the optional 120Ω termination at the end of the line if needed.
Q4: What TTL level is supported?
The TTL(UART) interface uses 3.3V logic level. (Do not connect directly to 5V TTL without level shifting.)
Q5: How many RS485 devices can I connect?
Up to 32 nodes typically; for more complex networks or longer distances, use repeaters and proper termination.
Q6: Is there automatic TX/RX switching on RS485?
Yes. It supports zero-delay automatic send/receive switching, simplifying RS485 communication.