RS-232C Communication
1 2 3 4 5
6 7 8 9
CONTROL port of the projector
1 | 2 | 3 | 4 | 5 |
6 | 7 | 8 |
| 9 |
- (1) | (1) | CD | of the computer | |
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RD (2) | (2) | RD |
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TD (3) | (3) TD |
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- (4) | (4) | DTR |
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GND (5) |
| (5) GND |
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- (6) | (6) | DSR |
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RTS (7) | (7) | RTS |
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CTS (8) | (8) | DTS |
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- (9) | (9) | RI |
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Connecting the cable
1. Turn off the projector and the computer.
Connect the CONTROL port of the projector with a
2. the computer by a
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 | byte_1 | byte_2 | byte_3 |
| byte_4 | byte_5 |
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Action |
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| Type |
| Setting code |
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low | high |
| low | high |
| low |
| high |
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Action (byte_0 - 1) |
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Action | Classification |
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| Content |
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1 | SET |
| Change setting to desired value. |
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2 | GET |
| Read projector internal setup value. |
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4 | INCREMENT |
| Increment setup value by 1. |
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5 | DECREMENT | Decrement setup value by 1. |
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6 | EXECUTE |
| Run a command. |
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7
LWU420 User