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X90 Image orientation - floor front
X91 Image orientation - ceiling front
X92 Image orientation - floor rear
X93 Image orientation - ceiling rear
X94 Back light board On
X95 Back light Board Off
X99 On line help
When an user sends a command, he must follow the command format in the list. After
he sends a command, program will acknowledge 2 pieces of information. This information,
we call it ‘ACK’ in the following content.
The format of first ACK is XnX
The length is 3, first and last characters are always be X. And the number ‘n’ is 0, 1 or
2. The explanation of n is
0: Right command format and function
1: Illegal format
2: Illegal function
So, if the user presses XA85, this one is wrong format, ACK will be X1X.
And if the user presses X98, because this function is not included in our command
table, ACK will be X2X.
For above situation, program sends the user an ACK, then waiting for a new
command.
If the user presses correct command, take an example, X35, first ACK, X0X will send
to the user. That tells the user it’s a right command. Then program starts to deal with this
command, and changes the aspect ratio to ‘anamorphic’ mode. When finish, the user will
receive 2
nd
ACK. The format is Xn_ccX
The length is 6. First and last characters are X, second character is the ACK, followed
by a ‘_’ character. ‘cc’ is the function number. So, in this case, the 2
nd
ACK is X0_35X. And
the user can continue to send next command.
For Y-group, this one is for our factory, not public. When our operators send
commands to the unit, the ACK format is identical as X-group, difference is only ‘Y’ instead
of ‘X’.