Hitachi CP-EX3051WN - Transmission Method; Ha F-Dup E

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7.4 Transmission method
7.4.1 HALF-DUPLEX
The transmission method can be selected from the menus, only when the
NETWORK %RID*E is selected for the COMMUNICATION TYPE.

OPTION menu > SER9ICE > COMMUNICATION in the Operating *uide)
HA/F-DUP/E;  FU//-DUP/E;
This method lets the projector make two way communication, but only one
direction, either transmitting or receiYing data, is allowed at a time.
The method does not allow the projector to receiYe the data from the computer
while waiting for response data from an external deYice. After the projector
receiYes the response data from an external deYice or the response limit time is
past, the projector can receiYe the data from the computer.
That means that the projector controls transmitting and receiYing the data to
synchroni]e the communication.
To use the HA/F-DUP/E; method, set up the RESPONSE /IMIT TIME following
the instructions below.
Using the RESPONSE /IMIT TIME menu, set the waiting time for response data
from an external deYice. 
OPTION menu > SER9ICE > COMMUNICATION in
the Operating *uide)
OFF  1s  2s  3s  OFF)
7. Network Bridge Function
RS-232C
RS-232C cable
External deYice
Wired /AN
/AN cable
Computer
Protocol change
TCP/IP data Serial data
Transmitting data
Discarding data
Transmitting data
Response limit
time
Response data
Response data
Wireless /AN
Discarding data