USB to 2-Wire RS485 Adapter / Converter


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The USB-485-1 is a port-powered, bi-directional, integrated USB to RS485 adapter / converter that can be used to convert any standard full-duplex USB port into a two-wire balanced half-duplex RS485 port and vice versa. The unit can be used to communicate with one loop of up to 256 units of RS485 devices and it comes with a built-in selectable 120-Ohm terminator for system reliability and easy installation (see Application Note). This USB to RS485 adapter / converter is powered from the USB port and it supports data auto-sensing & self-adjusting, therefore, no baud rate setting is required. And with the data direction auto-turnaround technology, no external power or flow control is required for RS485 communications. The USB to RS485 adapter / converter uses the latest FTDI chipset and is fully compatible with Windows 10 / 8 / 7 / Vista / XP / Server2008 / Server2003 / 2000 / 98 (32-bit), Windows 10 / 8 / 7 / Vista / XP / Server2008 / Server2003 (64-bit), Win CE, Mac, and Linux.


  • USB to 2-wire RS485 adapter / converter.
  • Adds one RS-485 port to your USB port.
  • Communicate with one loop of up to 256 units of RS485 devices.
  • 300 to 3M Baud operation (auto-sensing and self-adjusting).
  • Built-in selectable 120Ω end-of-line terminator for system reliability and easy installation.
  • Built-in 15kV ESD static and circuit protection.
  • Data direction auto-turnaround, no flow control is required.
  • Supports Windows 10 / 8 / 7 / Vista / XP / Server2008 / Server2003 / 2000 / 98 (32-bit), Windows 10 / 8 / 7 / Vista / XP / Server2008 / Server2003 (64-bit), Win CE, Mac, and Linux.
  • Supports remote wakeup and power management.
  • Plug and play (hot-pluggable, data format auto-sensing and self-adjusting).
  • Port-powered, no external power required.
  • No IRQs required, no IRQ conflicts.
  • Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
  • Safety: Strictly certified by world-class lab SGS / TUV (Cert No. E1/2013/90010C; E1/2013/90011C).
  • 5-year manufacturer's warranty.


Part Number: USB-485-1
Compatibility: USB 2.0 (backward compatible) and EIA/TIA RS-485 standards
Power Source: From USB port
Current Consumption: Less than 60mA
Cable length: 3.3 ft (1 m)
Baud Rates: 300 to 3M bps (Auto-sensing & Self-adjusting)
Distances: USB side: 10ft (3m); RS-485 side: Depending on the power from USB port, will transmit up to 4000ft (1.2km) at 19,200bps
Connectors: USB Side: Type A Male; RS-485 Side: DB-9 Male / 5-Way Terminal Block
Maximum number of drops: 256
End of Line Terminator: 120Ω (Built-in, selectable)
Dimensions (H x W x D): 0.8 x 1.3 x 3.6 in (20 x 32 x 92mm) (excluding cable)
Weight: 3.8 oz (108 g)
Operating Temperature: 32ºF to 104ºF (0ºC to 40ºC)
Operating Humidity: Up to 90% RH (no condensation)





CommFront products are strictly certified by SGS and/or TUV - the Nationally Recognized Testing Laboratories [NRTLs] in North America (approved by OSHA) and the Notified Bodies in the European Union. Learn More




CommFront products are designed and manufactured to ISO 9001 standards. Our quality control system is strictly certified by SGS (Cert No. SG12/04213). Learn More




CommFront products have been proven to be reliable. We back our high-quality products with a 5-year replacement warranty and a 30-day risk-free money-back guarantee. Learn More

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