Version 1.1
5.Communication
1)Connection
◆Data Communication :
◆Data length : 8bit data
◆ Stop bit | : | 1 bit |
◆ Parity | : | None |
◆ Baudrate | : | 4800, 9600, 19200, 38400 bps ※default value : 9600 bps |
2)Communication Protocol
◆All communication data consist of nine bytes.
◆Communication data start with A0(h).
◆The format of the communication data is shown below.
9 Byte Fixed
Byte1 |
| Byte 2 | Byte 3 |
| Byte 4~8 |
| Byte 9 |
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Start Code |
| Sender | Target |
| Command (5) |
| Check sum |
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A0H(1) |
| Address(1) | Address(1) |
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Data Byte |
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| Type | Contents |
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Byte 1 |
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| Start Code | A0H |
| Data Packet Starting Point |
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Byte 2 |
| Sender Address | Sender address |
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Byte 3 |
| Target Address | Target address |
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Byte 4 |
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Byte 5 |
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Byte 6 |
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| Command |
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Byte 7 |
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Byte 8 |
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Byte 9 |
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| Check Sum | LSB* of (FFFFH - ( Sum from Byte2 to Byte8)) |
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※Checksum calculating example
Example of Pan(Left) command with motor speed 20H.
In this example, camera's address is 01H.
Byte 2 | Byte 3 | Byte 4 |
| Byte 5 | Byte 6 | Byte 7 | Byte 8 | Byte 9 |
00H | 01H | 01H |
| 00H | 01H | 20H | 00H | DCH |
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Sum from Byte2 to Byte8 = 23H |
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∴FFFFH - 23H = FFDCH ; LSB of FFDCH=DCH
∴Check Sum : DCH
◆Ack. Format
Samsung communication utilizes Ack. codes. When controller sends a command, the camera sends back an Ack. This is our basic procedure to make sure that the communication and the camera function are properly executed.
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