Handshake Constants
| Constant | Value | Description |
| comNone | 0 | No handshaking. |
| comXonXoff | 1 | XOn/XOff handshaking. |
| comRTS | 2 | Request-to-send/clear-to-send handshaking. |
| comRTSXOnXOff | 3 | Both request-to-send and XOn/XOff handshaking. |
OnComm Constants
| Constant | Value | Description |
| comEvSend | 1 | Send event. |
| comEvReceive | 2 | Receive event. |
| comEvCTS | 3 | Change in clear-to-send line. |
| comEvDSR | 4 | Change in data-set ready line. |
| comEvCD | 5 | Change in carrier detect line. |
| comEvRing | 6 | Ring detect. |
| comEvEOF | 7 | End of file. |
Error Constants
| Constant | Value | Description |
| comEventBreak | 1001 | Break signal received |
| comEventFrame | 1004 | Framing error |
| comEventOverrun | 1006 | Port overrun |
| comEventRxOver | 1008 | Receive buffer overflow |
| comEventRxParity | 1009 | Parity error |
| comEventTxFull | 1010 | Transmit buffer full |
| comEventDCB | 1011 | Unexpected error retrieving Device Control Block (DCB) for the port |
InputMode Constants
| Constant | Value | Description |
| comInputModeText | 0 | (Default) Data is retrieved through the Input property as text. |
| comInputModeBinary | 1 | Data is retrieved through the Input property as binary data. |