3M S15 Operator's Manual page 59

RS-232C Communication
9 8
7 6
3 2 1
5 4
CONTROL port
of the projector
Connecting the cable
Turn off the projector and the computer.
1.
Connect the CONTROL port of the projector with a RS-232C port of the
2.
computer by a RS-232C cable. Use the cable that fulfills the specification
shown in the previous page.
Turn the computer on, and after the computer has started up turn the
3.
projector on.
Communications setting
19200bps, 8N1
1. Protocol
Consist of header (7 bytes) + command data (6 bytes).
2. Header
BE + EF + 03 + 06 + 00 + CRC_low + CRC_high
CRC_low : Lower byte of CRC flag for command data
CRC_high : Upper byte of CRC flag for command data
3. Command data
Command data chart
byte_0
Action
low
Action (byte_0 - 1)
Action Classification
1 SET
2 GET
4 INCREMENT
5 DECREMENT
6 EXECUTE
© 3M 2005. 3M™ Digital Projector S15/X15
RD (2)
TD (3)
GND (5)
RTS (7)
CTS (8)
byte_1 byte_2
Type
high low
Change setting to desired value.
Read projector internal setup value.
Increment setup value by 1.
Decrement setup value by 1.
Run a command.
RS-232C cable
- (1) (1) CD
(2) RD
(3) TD
- (4) (4) DTR
(5) GND
- (6) (6) DSR
(7) RTS
(8) DTS
- (9) (9) RI
byte_3 byte_4
Setting code
high low
Content
Technical (continued)
1
RS-232C port
of the computer
byte_5
high
2 3 4 5
6
8
7 9
59