耟 | 耟 |
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X90 | Image orientation - floor front |
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X91 | Image orientation - ceiling front |
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X92 | Image orientation - floor rear |
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X93 | Image orientation - ceiling rear |
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X94 | Back light board On |
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X95 | Back light Board Off |
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耟 | 耟 |
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X99 | On line help |
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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 2nd 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 2nd ACK is X0_35X. And the user can continue to send next command.
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