Planet XRT-811 User Manual page 51

"Release"
OR
"Renew"
Refresh
If the ISP's DHCP Server has NOT allocated an IP Address for
XRT-811, this button will say "Renew". Clicking the "Renew"
button will attempt to re-establish the connection and obtain an
IP Address from the ISP's DHCP Server.
If an IP Address has been allocated to XRT-811 (by the ISP's
DHCP Server), this button will say "Release". Clicking the "Re-
lease" button will break the connection and release the IP
Address.
Update the data shown on screen.
Operation and Status
47