Ricoh PJ WU6181N 6200-Lumen WUXGA LCD Projector (No Lens) - Manual (Page 185)

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6. Installation and Connections
Example of wireless LAN connection
(Network Type → Infrastructure)
PC with wireless LAN card
inserted PC with built-in wireless
LAN function
Wired LAN
Wireless access point
USB Wireless LAN Unit
To enable direct communication (i.e., peer-to-peer) between personal computers and projectors, you need to select the Ad Hoc mode.
PC with wireless LAN card
inserted PC with built-in wireless
LAN function
(Network Type → Ad Hoc)
USB Wireless LAN Unit