Kramer Electronics VP-790 - Manual (Page 12)

8 VP-790 Protocol - Communication
The return value(s) of this API function is the error code of BYTE type, i.e. a 1 byte
value. It is
0x00 if the call was successful or an error occurred if it is not zero. Let us
assume the call was successful for this example. The other return value is the
current contrast setting of UWORD32 type, i.e. a 4 byte value. Let us assume it is
the by 10% increased value of the foregoing example, i.e.
0x92 1A 18 50 . The
payload of the data is 5 bytes. The payload of the data package is 12 + 5 bytes =
0x11 bytes. The payload of data package and application header is 17 + 16 = 0x21
bytes.
Direction RS232 data
PC sends command 53 41 50 01 FF FF FF FF 00 00 00 1D 00 00 00 00
54 50 01 00 00 00 00 00 00 00 00 0D 00 00 00 00
50 46 00 7E 00 00 00 00 00 00 00 01 01
Board acknowledges to have received
a command
73 61 50 01 FF FF FF FF 00 00 00 00 00 00 00 00
Board sends answer (return values) 53 41 50 01 FF FF FF FF 00 00 00 21 00 00 00 00
74 50 01 00 00 00 00 00 00 00 00 11 00 00 00 00
70 46 00 7E 00 00 00 00 00 00 00 05 00 92 1A 18
50
PC acknowledges to have received an
answer
73 61 50 01 FF FF FF FF 00 00 00 00 00 00 00 00
Direction TCP/IP data
PC sends command 54 50 01 00 00 00 00 00 00 00 00 0D 00 00 00 00
50 46 00 7E 00 00 00 00 00 00 00 01 01
Board acknowledges to have received
a command
None
Board sends answer (return values) 74 50 01 00 00 00 00 00 00 00 00 11 00 00 00 00
70 46 00 7E 00 00 00 00 00 00 00 05 00 92 1A 18
50
PC acknowledges to have received an
answer
None
1.7.4 Switch Between Inputs
The API byOSDInputFormatSet is used to change the input channel.
The API Index is decimal 318, i.e. hexadecimal 0x01 3E . If we want to switch to e.g.
the HDMI channel 0x00 00 00 08 (UWORD32 type) has to be transmitted.
The return value(s) of this API function is the error code of BYTE type. 0x00 means
no error occurred.