8
RS-232C Communication (continued)
Requesting projector status (Get command)
6HQG WKH UHTXHVW FRGH +HDGHU &RPPDQG GDWD µ+¶µ+¶ W\SH
E\WHVµ+¶µ+¶IURPWKHFRPSXWHUWRWKHSURMHFWRU
7KHSURMHFWRUUHWXUQVWKHUHVSRQVHFRGHµ'+¶GDWDE\WHVWRWKHFRPSXWHU
Changing the projector settings (Set command)
6HQGWKHVHWWHDGHU&RPPD¶µ+¶W\SHE\WHV
VHWWLQJFRGHE\WHVIURPWKHFRPSXWHUWRWKHSURMHFWRU
7KHSURMHFWRUFKDQJHVWKHVHWWLQJEDVHGRQWKHDERYHVHWWLQJFRGH
7KHSURMHFWRUUHWXUQVWKHUHVSRQ¶WRWKHFRPSXWHU
Using the projector default settings (Reset Command)
7KH FRPSXWHU VHQGV WKH GHIDXOW VHWWLQJ FRGH +HDGHU &RPPDQG GDWD
µ+¶µ+¶W\SHE\WHVµ+¶µ+¶WRWKHSURMHFWRU
7KHSURMHFWRUFKDQJHVWKHVSHFL¿HGVHWWLQJWRWKHGHIDXOWYDOXH
7KHSURMHFWRUUHWXUQVWKHUHVSRQ¶WRWKHFRPSXWHU
Increasing the projector setting value (Increment command)
7KH FRPSXWHU VHQGV WKH LQFUHPHQW FRGH +HDGHU &RPPDQG GDWD
µ+¶µ+¶W\SHE\WHVµ+¶µ+¶WRWKHSURMHFWRU
7KHSURMHFWRULQFUHDVHVWKHVHWWLQJYDOXHRQWKHDERYHVHWWLQJFRGH
7KHSURMHFWRUUHWXUQVWKHUHVSRQ¶WRWKHFRPSXWHU
Decreasing the projector setting value (Decrement command)
7KH FRPSXWHU VHQGV WKH GHFUHPHQW FRGH +HDGHU &RPPDQG GDWD
µ+¶µ+¶W\SHE\WHVµ+¶µ+¶WRWKHSURMHFWRU
7KHSURMHFWRUGHFUHDVHVWKHVHWWLQJYDOXHRQWKHDERYHVHWWLQJFRGH
7KHSURMHFWRUUHWXUQVWKHUHVSRQ¶WRWKHFRPSXWHU
When the projector cannot understand the received command
:KHQWKHSURMHFWRUFDQQRWXQGHUVWDQGWKHUHFHLYHGFRPPDQGWKHHUU¶
LVVHQWEDFNWRWKHFRPSXWHU
6RPHWLPHV WKH SURMHFWRU FDQQRW SURSHUO\ UHFHLYH WKH FRPPDQG ,Q VXFK D
FDVHWKHFRPPDQGLVQRWH[HFXWHGDQGWKHHUU¶LVVHQWEDFNWRWKH
FRPSXWHU,IWKLVHUURUFRGHLVUHWXUQHGVHQGWKHVDPHFRPPDQGDJDLQ
When the projector cannot execute the received command.
:KHQWKHSURMHFWRUFDQQRWH[HFXWHWKHUHFHLYHGFRPPDQGWKHHUURUFRGHµ&+¶
µ[[[[+¶ LV VHQW EDFN WR WKH FRPSXWHU :KHQ WKH GDWD OHQJWK LV JUHDWHU WKDQ
LQGLFDWHGE\WKHGDWDOHQJWKFRGHWKHSURMHFWRULJQRUHWKHH[FHVVGDWDFRGH
&RQYHUVHO\ ZKHQ WKH GDWD OHQJWK LV VKRUWHU WKDQ LQGLFDWHG E\ WKH GDWD OHQJWK
FRGHDQHUURUFRGHZLOOEHUHWXUQHGWRWKHFRPSXWHU
NOTE
2SHUDWLRQ FDQQRW EH JXDUDQWHHG ZKHQ WKH SURMHFWRU UHFHLYHV DQ
XQGH¿QHGFRPPDQGRUGDWD
3URYLGHDQLQWHUYDORIDWOHDVWPVEHWZHHQWKHUHVSRQVHFRGHDQGDQ\RWKHUFRGH
7KHSURMHFWRURXWSXWVWHVWGDWDZKHQWKHSRZHUVXSSO\LVVZLWFKHG21DQGZKHQWKH
ODPSLVOLW,JQRUHWKLVGDWD
&RPPDQGVDUHQRWDFFHSWHGGXULQJZDUPXS