HP PN1050 - Manual (Page 39)

ENWW TCP/IP Configuration 39
If you change to Manual configuration, the DHCP-configured IP address is
released and the user-specified IP parameters are used. Therefore, if you
manually provide the IP address, you should also manually set all of the
configuration parameters, such as subnet mask, default gateway, and
idle timeout.
Note If you choose to re-enable a DHCP configuration, the
projector server will acquire its configuration information
from a DHCP server. This means that when you choose
DHCP and complete your configuration session, the TCP/IP
protocol for the projector server is re-initialized and all
current configuration information is deleted. The projector
server then attempts to acquire new configuration
information by sending DHCP requests on the network to a
DHCP server.