SET_TX_CHANNEL_FLAG
SET_TX_CHANNEL_FLAG(channel, fDSR, 0);
SET_TX_CHANNEL_FLAG(channel, fCTS, 0);
SET_TX_CHANNEL_FLAG(channel, fCD, 0);
SET_TX_CHANNEL_FLAG(channel, fRI, 0);
SET_TX_CHANNEL_FLAG(channel, fHEAD, 0);
SET_TX_CHANNEL_FLAG(channel, fTAIL, 0);
SET_TX_CHANNEL_FLAG(channel, fSTATE, 1);
SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 1);
SET_TX_CHANNEL_FLAG(channel, fDSR, is_open);
SET_TX_CHANNEL_FLAG(channel, fCTS, is_open);
SET_TX_CHANNEL_FLAG(channel, fCD, is_open);
SET_TX_CHANNEL_FLAG(channel, fSTATE, 1);
SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 0);
SET_TX_CHANNEL_FLAG(channel, fBLOCKREADINTR, 1);
SET_TX_CHANNEL_FLAG(channel, fTAIL, 0);
SET_TX_CHANNEL_FLAG(channel, fHEAD, 1);