The serial signal constants are bit flags that indicate the state of the serial signals. If the bit is set then the signal is active.
| SerialSignal_DCD | Data Carrier Detect (RLSD) |
| SerialSignal_TXD | Transmit Data |
| SerialSignal_RI | Ring Indicator |
| SerialSignal_RXD | Receive Data |
| SerialSignal_CTS | Clear to Send |
| SerialSignal_RTS | Request to Send |
| SerialSignal_DSR | Data Set Ready |
| SerialSignal_DTR | Data Terminal Ready |
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