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10. RS-232 Control Protocol
10.1 Hardware Specifications
Serial Port Specifications
Item
Data Rate
Character Length
Parity
Connector
Serial Data Word Descriptions
Start bit always low
Data 8 bit; LSB first
Odd Parity
Stop bit always high
Command / Message Block Structure
Sync Byte
Byte Count
Item
Sync Byte
Byte Count
Command Code
Parameter 0 ~ 254 Byte
Checksum
Example:
Set ChromaKey mode
0xAA 0x04 0x10 0x01 0x01 0x12
0xAA: Sync Byte
0x04: Byte Count
0x10: Command Code = Operation Mode
0x01: Parameter 1 = Set keying mode
0x01: Parameter 2 = Chroma
0x12: Checksum = (0x10 + 0x01 + 0x01) & 0xFF
Description
38,400 Baud
1 start bit + 8 data bits + 1 parity bit + 1 stop bit
Odd parity
9-Pin D-Sub
Command
Parameter 1
Byte
Description
0xAA
The total number of subsequent bytes in the block (from
command byte to Checksum byte).
Valid byte count values range from 0x01 to 0xFF
Command Code Byte
Parameters
Checksum (Command + Parameter 1 + Parameter 2
+ Parameter N) & 0xFF
Parameter 2
...
32
Parameter N
Checksum
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