ViewSonic PJ550 - RS-232 C Communication Protocol; Communication Protocol Details; Command Header Format; Command Data Structure

62
13. RS-232C communication
(1) Turn off the projector and computer power supplies and connect with the RS-232C cable.
(2) Turn on the computer power supply and, after the computer has started up, turn on the projector power supply.
1
23
4
5
6
7
89
10
11
1213
1415
Control terminal
D-sub 15-pin shrink
Projector Computer
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 ag for command data.
CRC_high : Upper byte of CRC ag for command data.
3 Command data
Command data chart
byte_0 byte_1
Action
low high
byte_2 byte_3
Type
low high
byte_4 byte_5
Setting code
low
high
Action Classification Content
Action (byte_0 - 1)
1 SET Change setting to desired value.
2 GET Read projector internal setup value.
4 INCREMENT Increment setup value by 1.
5 DECREMENT Decrement setup value by 1.
6 EXECUTE Run a command.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
RD
TD
GND
SELO
RTS
1
2
3
4
5
6
7
8
9
CD
RD
TD
DTR
GND
DSR
RTS
DTS
RI
1
2 3 4 5
6 7
8
9
RS-232C terminal
D-sub 9-pin
All manuals and user guides at all-guides.com