These are set up a bit weird compared to normal WISP radio equipment. The default IP address is 192.0.2.1 for the radio. So you need to set a 192.0.2.3 with a subnet of 255.255.255.240. Looks like it is usually only accessible via the management port and you need to make or buy a special patch cable.

https://community.cambiumnetworks.com/t/physical-reset-on-ptp850c/88884/2

The User Guide is available here

https://www.cambiumnetworks.com/wp-content/uploads/2021/07/PTP-850-C-E-S-User-Guide-11.5.pdf

You can download the Installation Guide from here

https://support.cambiumnetworks.com/file/5034c6e4b584c5d40429a163cef0d7a6257f8dc3

Both those documents show how to install and get into the device.