Details
Q-USB-485 USB Serial Converter
The QEED Q-USB-485 is a galvanically isolated USB to RS485 serial converter designed for safe communication with Modbus RTU devices, power meters, signal converters, current transducers, controllers and other RS485 instruments.
It uses an FTDI USB chip and supports Windows certified drivers, allowing quick connection between a PC and RS485 field devices for configuration, commissioning, testing and data communication.
Overview
Q-USB-485 provides a safe and convenient way to connect a laptop or PC to RS485 Modbus devices. It is useful during site commissioning, meter configuration, Modbus testing, troubleshooting, firmware work and local communication checks.
The galvanic isolation helps protect the computer and operator from potential differences or electrical noise between the PC side and the RS485 field side, making it more suitable for industrial environments compared with basic non-isolated USB converters.
Key Features
5kV Isolation
Galvanic isolation between USB and RS485 helps improve safety and communication reliability.
FTDI USB Chip
Uses a recognised FTDI USB chipset for stable PC connection and driver support.
Modbus RTU Ready
Suitable for connecting to RS485 Modbus meters, analyzers, transducers and controllers.
Automatic Driver Support
Windows certified drivers can be downloaded automatically when the PC is connected to the internet.
LED Indicators
Transparent housing allows viewing of TX, RX and supply LED indicators.
Removable Terminals
Removable connectors make wiring, testing and field commissioning easier.
Typical Applications
Meter Configuration
Configure RS485 power meters, energy analyzers and Modbus devices from a PC.
Modbus Testing
Check register maps, slave addresses, baud rate settings and communication response.
Commissioning
Useful for site engineers during panel testing and industrial communication setup.
Signal Converter Setup
Connect to QEED signal converters and RS485 instruments for parameter configuration.
Energy Monitoring
Useful for checking RS485 devices before connecting them to EMS, BMS, SCADA or IoT gateways.
Field Troubleshooting
Helps identify wiring, addressing, baud rate and Modbus communication issues.
Technical Highlights
| Parameter | Specification |
|---|---|
| Product Type | USB to RS485 serial converter |
| Isolation | 5kV galvanically isolated |
| USB Chip | FTDI USB chip |
| Serial Interface | RS485 |
| Protocol Use | Suitable for Modbus RTU communication |
| Maximum Baud Rate | Up to 500 kbit/s |
| Common Mode Voltage | -60V to +60V between A/B inputs and outputs |
| Connection | Removable connectors |
| Indicators | TX, RX and supply LED indicators |
Why Use an Isolated USB to RS485 Converter?
In industrial sites, RS485 networks may be connected across different panels, power supplies and grounding points. A basic non-isolated USB converter can expose the connected PC to electrical noise, ground potential differences or wiring faults.
The Q-USB-485 provides galvanic isolation, making it more suitable for commissioning and troubleshooting Modbus devices in panels, machines, energy monitoring systems and automation networks.
- Safer PC-to-field-device connection
- Useful for industrial RS485 Modbus troubleshooting
- Suitable for power meters, signal converters and controllers
- Helps during installation, testing and maintenance work
- Compact tool for engineers working with RS485 networks
Integration with 3Wire and IoTWatt 4.0 Systems
Q-USB-485 can be used during the commissioning of RS485 devices that later connect to 3Wire IoT gateways, EMS, BMS, SCADA or IoTWatt 4.0. It is useful for confirming device address, baud rate, register values and communication stability before permanent system integration.
QEED Q-USB-485 Supply and Support
Saturn Pyro supports QEED Q-USB-485 USB to RS485 converters for industrial Modbus communication, meter commissioning, energy monitoring, IoT gateway setup and automation troubleshooting in Malaysia.
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