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ViewSonic PJL3211
RS-232C Communication
RS-232C Communication
6
7
8
9
1 2 3 4 5
6
7
8
9
1 2 3 4 5
CONTROL port RS-232C cable (Cross) RS-232C port
of the projector of the PC
- (1) (1) CD
RD (2) (2) RD
TD (3) (3) TD
- (4) (4) DTR
GND (5) (5) GND
- (6) (6) DSR
RTS (7) (7) RTS
CTS (8) (8) DTS
- (9) (9) RI
Connecting the cable
1.
Turn off the projector and the PC.
2.
Connect the CONTROL port of the projector with a RS-232C port of the PC
by a RS-232C cable (cross). Use the cable that fullls the specication shown
in the previous page.
3.
Turn the PC on, and after the PC has started up turn the 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 ag for command data
CRC_high : Upper byte of CRC ag for command data
3. Command data
Command data chart
byte_0 byte_1 byte_2 byte_3 byte_4 byte_5
Action
Type Setting code
low high low high low high
Action (byte_0 - 1)
Action Classication Content
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.