Technical Appendix
RS-232 Communication
1.Turn off the projector and computer power supplies and connect with the
2.Turn on the computer power supply and, after the computer has started up, turn on the
projector power supply. | Projector | Computer |
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| 1 | 1 | CD |
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CONTROL Terminal | 2 | 2 | RD |
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3 | 3 | TD | |||||||||||
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| 4 | 4 | DTR | |||||
5 | 5 | GND |
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5 | 4 | 3 | 2 | 1 |
| SELO 6 | 6 | DSR | 1 | 2 3 | 4 | 5 | |
| RTS 7 | 7 | RTS | ||||||||||
| 10 | 9 | 8 | 7 | 6 | 8 | 8 | DTS | 6 | 7 | 8 | 9 | |
15 | 14 | 13 12 | 11 |
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| 9 | 9 | RI |
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| GND 10 |
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| 11 |
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| 12 |
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| RD 13 |
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| TD 14 |
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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
byte_0 |
| byte_1 | byte_2 |
| byte_3 | byte_4 | byte_5 |
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Action |
| Type |
| Setting Code | |||
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low |
| high | low |
| high | low | high |
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| Action | Classification | 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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36 | 3M™ Personal Projector MP8746/MP8747 | © 3M IPC 2000 |
