Technical Guide - InFocus
Technical Guide - InFocus
Technical Guide - InFocus
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Daisy Chain Communication<br />
Calculation of Checksum<br />
Sum up all of 12 bytes except the Checksum, then make the bit inversion of the<br />
lowest byte of the total, and add 1 to the inverted byte. The calculated result is<br />
the Checksum data.<br />
Exp. Communication Group: A / Communication ID: 1<br />
Header data (7 bytes)<br />
Command data (6 bytes)<br />
Header Packet Data Size Group ID Checksum Action Type Setting<br />
Type<br />
Code<br />
BE EF 83 06 01 01 66 01 00 00 60 01 00<br />
BE + EF + 83 + 06 + 01 + 01 + 01 + 00 + 00 + 60 + 01 + 00 = ‘029AH’<br />
The lowest byte of ‘029AH’ is ‘9AH’ (1001 1010). Making the bit inversion of the<br />
‘9AH’ gets ‘65H’ (0110 0101), then, add 1. The calculated checksum is ’66H’.<br />
Group and ID Settings<br />
This daisy chain command can adjust the control range by using the Group<br />
identification and ID.<br />
Group ID Direction note<br />
1~16 1~64 Individual control The command is available to the projectors with<br />
the same Group identification and ID numbers and<br />
command setting.<br />
1~16 0 Designated control<br />
according to the<br />
Group identification<br />
0 1~64 Designated control<br />
according to the ID<br />
The command is available to the projectors with the<br />
same Group identification and command setting.<br />
The command is available to the projectors with the<br />
same ID number and command setting.<br />
0 0 Unlimited. The command is available to the all projectors.<br />
15
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