Hitachi ED-A220N user manual Transmission method, Half-Duplex

6. Network Bridge Function

6.4 Transmission method

The transmission method can be selected from the menus, only when the NETWORK BRIDGE is selected for the COMMUNICATION TYPE.

(OPTION menu – SERVICE – COMMUNICATION in the User’s Manual – Operating Guide)

HALF-DUPLEX  FULL-DUPLEX

6.4.1 HALF-DUPLEX

This method lets the projector make two way communication, but only one direction, either transmitting or receiving data, is allowed at a time.

The method does not allow the projector to receive the data from the computer while waiting for response data from an external device. After the projector receives the response data from an external device or the response limit time is past, the projector can receive the data from the computer.

That means that the projector controls transmitting and receiving the data to synchronize the communication.

To use the HALF-DUPLEX method, set up the RESPONSE LIMIT TIME following the instructions below.

	TCP/IP data	Protocol change	Serial data
	Ethernet		RS-232C
	LAN cable	RS-232C cable
Computer			External device

Transmitting data
	Transmitting data
Discarding data	Response limit
	time
	Response data
Response data	Transmitting data

Using the RESPONSE LIMIT TIME menu, set the waiting time for response data from an external device. (OPTION menu – SERVICE – COMMUNICATION in the User’s Manual – Operating Guide)

OFF  1s  2s  3s ( OFF)

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