Command Control via the Network
Automatic Connection Break
The TCP connection will be automatically disconnected after there is no communi-
cation 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 authenti
-
cation with an MD5 (Message Digest 5) algorithm.
When the projector is using a LAN, a random eight bytes will be returned if au-
thentication is enabled. Bind this received 8 bytes and the authentication pass-
word and digest this data with the MD5 algorithm and add this in front of the com-
mands to send.
Following is a sample if the authentication password is set to “password” and the
random eight bytes are “a572f60c”.
1) Select the projector.
2) Receive the random eight bytes “a572f60c” from the projector.
3) Bind the random eight 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.
92ViewSonic PJ1158
