Samsung SCC-ZM395N - Manual (Page 24)

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5. Communication
1) Connection
◆ Data Communication : Start-Stop Synchronized serial interface
◆ 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
Start Code
A0H(1)
Sender
Address(1)
Target
Address(1)
Command (5)
Check sum
(1)
Data Byte Type Contents Remarks
Byte 1 Start Code A0H Data Packet Starting Point
Byte 2 Sender Address Sender address
Byte 3 Target Address Target address
Byte 4
Command
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9 Check Sum LSB* of (FFFFH - ( Sum from Byte2 to Byte8))
※ 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
Sum from Byte2 to Byte8 = 23H
∴ 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.