TRENDnet TS-U9 USB to RS-232 serial adapter

TRENDnet TS-U9 USB to RS-232 serial adapter

Due to high demand and global product shortages due to the pandemic, please call for availability.

RS-232 is still the interface of choice amongst popular computerized telescope manufacturers, due to its low cost, ease to program, and deeply ingrained support with all the popular astronomy programs. Unfortunately RS-232 is a legacy interface which is losing support on desktop and portable computing devices.

The TRENDnet USB to RS-232 serial adapter adds a high-speed RS-232 port to most computers running Windows or MacOS. Easy plug-and-play installation: install the driver, reboot, then plug in the USB to RS-232 adapter.


  • Supports data rate up to 6 Mbps
  • Detects USB suspend condition
  • Install as a standard Windows COM port
  • Full RS-232 modem control signals/data: TxD, RxD, RTS, CTS, DSR, DTR, DCD, RI, GND
  • Provides dual buffers for upstream and downstream data transfer
  • Supports automatic handshake mode
  • Powered by USB port, no external power adapter required


  • USB Interface: USB 1.1, USB 2.0 compatible
  • RS-232 Interface: (9-pin) male
  • Cable Length: 60cm (24")
  • Cable Gauge: 28/24 AWG
  • Data Rate: 6 Mbps
  • Power Consumption: 500mA (max)
  • Weight: 40g (1.4oz)

System Requirements

  • Windows 10, Windows 8 (32/64-bit), Windows 7 (32/64-bit), Vista (32/64-bit), XP (32/64-bit), 2000, ME, 98SE
  • Mac OS 10.1~10.7
  • One free USB port