private void initTXBuffer()
{
for(int i=0; i<TX_BUFFER_LENGTH; i++) TxBuffer[i] = (byte)255;
TxBuffer[000] = DMX_PRO_START_MSG;
TxBuffer[001] = DMX_PRO_LABEL_DMX;
TxBuffer[002] = (byte)(N_DMX_CHANNELS+1 & 255);;
TxBuffer[003] = (byte)((N_DMX_CHANNELS+1 >> 8) & 255);
TxBuffer[004] = DMX_PRO_START_CODE;
TxBuffer[517] = DMX_PRO_END_MSG;
}