Grass Valley XSwitch Feb 08 2006 - Manual (Page 38)

38 XSWITCH Installation and Operation Manual
Appendix A — Remote Activation
Value$, dummylength -3, 2))
Packet$ = Dstring$ + Chr$(LSB) + Chr$(MSB) ‘This is
the packet string.
End
Where the input string is made up of single characters to represent the
field’s decimal value in the character’s own ASCII value AND the actual
command string for the XSWITCH.
Example ‘C’ Program
//====================================================
// UpdateCRC16()
//====================================================
// Calculated: X^16 + X^12 + X^5 + 1
//----------------------------------------------------
UINT UpdateCRC16( BYTE b, UINT crc )
{
unsigned int i;
// Calculate CRC
for( i = 0; i < 8; i++)
{
return crc;
}//end UpdateCRC16()
//====================================================
// CalcCRC16()
//====================================================
UINT CalcCRC16( LPBYTE buf, DWORD size )
{
UINT crc = 0;
//Calc CRC16 on buffer
for ( DWORD i = 0; i < size; i++ )
crc = UpdateCRC16 ( buf[i], crc);
}//end CalcCRC16()
Example for basic program V 2.0
Known command string to send: “2,L”
LEN is length of command string.
Known values:
DEST: 04 decimal value --> convert to ASCII character of