3M MP8670 - Manual (Page 35)

3M ™ Multimedia Projector MP8670 © 3M 1999
TECHNICAL
A-10
Serial Command Codes
All numbers in this document are in Hexadecimal. You must send at the same communication setting
as the projector and use a null modem serial cable to connect to the projector.
There are four types of messages: 1) ASK, 2) REPLY, 3) SET and 4) DEFAULT.
Ask Code:
User:
20 XX
XX is the attribute you are checking.
Projector:
1Y XX Y bytes of data
This is a reply code. The Y is the number of extra bytes that come after the command.
The XX is the same as in the Ask code.
Set Code:
User:
3Y XX Y bytes of data
XX is the attribute you are checking. The Y is the number of bytes for the data.
Projector:
1Y XX Y bytes of data
This is a reply code. The Y is the number of extra bytes that come after the command.
The XX is the same as in the Set code.
Default Code:
User:
40 XX
XX is the attribute you are checking.
Projector:
1Y XX Y bytes of data
This is a reply code. The Y is the number of extra bytes that come after the command.
The XX is the same as in the Ask code.
Errors:
For an error, the projector will reply with the same code that was sent but with a 0 in the first nibble.