The ABSniffer 528 scans for devices and sends the data via USB/TTL plugged into a PC, Mac, Linux or Raspberry Pi. It shows up on the Raspberry Pi as /dev/ttyACM0. It communicates with PC through a virtual UART port.

Sending "AT+SCAN1" to the UART port RX responds with the devices nearby, for example:

OK+SCAN:123B6A1AF0E6,-86,3,30,0201061
AFF4C000215B5B182C7EAB14988AA99B5C1517008D90001E6F0C5

OK+SCAN:123B6A1AF0D8,-93,3,30,0201061
AFF4C000215B5B182C7EAB14988AA99B5C1517008D90001D8F0C5

The response contains the MAC address, RSSI, advertising type, advertisement data length and the advertising data.
It can detect up to 100 advertisements per second.

This device is based on the Nordic's NRF52832 and uses a CP2104 to provide a USB Serial interface. The NRF52832 is re-programmable using Nordic tools, SDKs and J-Link (see pins in above image).

Host interfaces: USB (USB/CDC)
Communication protocol: TTL
Default settings:
Baud rate: 115200
Data bit: 8
Parity check: no
Stop bit: 1

Further technical details are available via the technical information page.