Kramer-electronics VP-790 Manual de usuario descargar pdf (Pagina 7)

VP-790 Protocol – Communication 3

Example: The Scaler Board answers to the BYTE

byOSDBrighntessSet(UWORD32 u32_value) API call. The return value is 0x00, i.e.

no error; the function has no other return values:

The data sent is (hex):

73 61 50 01 FF FF FF FF 00 00 00 00 00 00 00 00

53 41 50 01 FF FF FF FF 00 00 00 1D 00 00 00 00

74 50 01 00 00 00 00 00 00 00 00 0D 00 00 00 00

70 46 00 68 00 00 00 00 00 00 00 01 00

Again the RS232 receiver, this time the PC, acknowledges the message with (hex):

73 61 50 01 FF FF FF FF 00 00 00 00 00 00 00 00

1.4 5BData Types

The following input/output data types exist:

• BYTE

• Unsigned 8-bit value one single byte

• UWORD16: unsigned 16-bit value, MSB first (2 bytes)

• SWORD16: signed 16-bit value, two’s complement, MSB first (2 bytes)

• UWORD32 (a.k.a. DWORD): unsigned 32-bit value, MSB first (4 bytes)

• SWORD32: signed 32-bit value, two’s complement, MSB first (4 bytes)

• CHAR[]: array of UTF-8 characters preceded by its length sent as

UWORD32

Length of array 1

char 2

char 3

char 4

char

MSB … … LSB BYTE BYTE BYTE BYTE

• WHCAR[]: array of UTF-16 characters preceded by its length sent as

UWORD32

Length of array First WCHAR Second WHCAR

MSB … … LSB MSB LSB MSB LSB

1 2 3 4 5 6 7 8 9 10 11 12 ... 125 126

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Kramer-electronics VP-790 Manual de usuario Pagina 7