0856:ac01 — uLinks USOTL4 RS422/485 Adapter

This is the USB identifier for a uLinks USOTL4 RS422/485 Adapter manufactured by B&B Electronics. The vendor ID 0856 is registered to B&B Electronics with the USB Implementers Forum, and ac01 is the product ID that B&B Electronics assigned to this particular model. When you run lsusb on Linux, this device appears as 0856:ac01 B&B Electronics uLinks USOTL4 RS422/485 Adapter.

Linux

$ lsusb
Bus 001 Device 004: ID 0856:ac01 B&B Electronics uLinks USOTL4 RS422/485 Adapter

You can filter directly with lsusb -d 0856:ac01, or get the full descriptor dump with lsusb -v -d 0856:ac01. Kernel messages from dmesg show the same pair as idVendor=0856, idProduct=ac01.

Windows

In Device Manager, open the device, go to Details → Hardware Ids. This device reports:

USB\VID_0856&PID_AC01
USB\VID_0856&PID_AC01&REV_0100

From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_0856&PID_AC01"

macOS

$ system_profiler SPUSBDataType
    uLinks USOTL4 RS422/485 Adapter:
      Product ID: 0xac01
      Vendor ID: 0x0856  (B&B Electronics)

Having driver issues with this device? Most USB devices are handled by a generic class driver; if yours shows up as an unknown device, confirm the ID above first, then check the manufacturer's downloads page.

The exact lines this page is generated from, in the upstream source file:

0856  B&B Electronics
	ac01  uLinks USOTL4 RS422/485 Adapter

See all 1 devices from B&B Electronics →