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9-2
RS-232 CONTROL
Sending a RECORD (single instruction)
A RECORD consists of 9 bytes of information in the following order:
STX, OFFS, ADR, CMD, DAT1, DAT2, DAT3, DAT4, CHKS
Where:
STX - 02H Make projector(s) listen for its (their) unique address.
OFFS - (1-255) Offset you choose so that none of the data or CMDs - 02H (STX).
Normally set the offset to 0.
ADRe - (1-255) Number corresponding to projector’s unique address (see dip switch setting).
If you are unsure of your projector’s address, set this to 0.
It will talk to your projector regardless of its address.
CMDe - (1-255) The command to be sent to the projector (see list of commands).
See command list for all possible functions.
DAT1e - (1-255) Additional data to be sent (set to 0 if not used)
DAT2e - (1-255) Additional data to be sent (set to 0 if not used)
DAT3e - (1-255) Additional data to be sent (set to 0 if not used)
DAT4e - (1-255) Additional data to be sent (set to 0 if not used)
CHKSe - (ADR + CMD + DAT1 + DAT2 + DAT3 + DAT4) mod 256 - add everything and keep
only 2 right most digits
Note: Bytes from ADR to CHKS are shown in bold with the suffix ‘e’ to indicate the of
fset is added before sending the byte
.