Hitachi CP-X3021WN 7.4Command Control via the Network continued, Automatic Connection Break

7.Other Functions

7.4Command Control via the Network (continued)

Automatic Connection Break

The TCP connection will be automatically disconnected after there is no

communication for 30 seconds after being established.

Authentication

The projector does not accept commands without authentication success

when authentication is enabled. The projector uses a challenge response type authentication with an MD5 (Message Digest 5) algorithm.

When the projector is using a LAN, a random 8 bytes will be returned if authentication is enabled. Bind this received 8 bytes and the Authentication Password and digest this data with the MD5 algorithm and add this in front of the

commands to send.

Following is a sample if the Authentication Password is set to “password” and the

random 8 bytes are “a572f60c”.

1)Connect the projector.

2)Receive the random 8 bytes “a572f60c” from the projector.

3)Bind the random 8 bytes “a572f60c” and the Authentication Password

“password” and it becomes “a572f60cpassword”.

4)Digest this bind “a572f60cpassword” with MD5 algorithm.

It will be “e3d97429adffa11bce1f7275813d4bde”.

5)Add this “e3d97429adffa11bce1f7275813d4bde” in front of the commands

and send the data.

Send “e3d97429adffa11bce1f7275813d4bde”+command.

6)When the sending data is correct, the command will be performed and the reply data will be returned. Otherwise, an authentication error will be returned.

NOTE • As for the transmission of the second or subsequent commands, the

authentication data can be omitted when the same connection.

66