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7. Reply Data
The connection ID (the data is same as the connection ID data on the sending
data format) is attached to the Network control commands reply data.
ACK reply: ‘06H’ + ‘xxH’
NAK reply: ‘15H’ + ‘xxH’
Error reply: ‘1CH’ + ‘xxxxH’ + ‘xxH’
Data reply: ‘1DH’ + ‘xxxxH’ + ‘xxH’
Projector busy reply: ‘1FH’ + ‘xxxxH’ + ‘xxH’
Authentication error reply: ‘1FH’ + ‘0400H’ + ‘xxH’
(‘xxH’ : connection ID)
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.
Combine 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) Select the projector.
2) Receive the random 8 bytes “a572f60c” from the projector.
3) Combine the random 8 bytes “a572f60c” and the authentication password
“password” and it becomes “a572f60cpassword”.
4) Use this combination “a572f60cpassword” with MD5 algorithm.
It will become “e3d97429adffa11bce1f7275813d4bde”.
5) Add “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 • During the transmission of the second or subsequent commands, the
authentication data can be omitted when using the same connection.
Command Control via the Network
(continued)