Supported RTS (request-to-send) control modes.
| Symbol | Value | Description |
|---|---|---|
Disabled | 0 | Disables the RTS line when the device is opened and leaves it disabled. |
Enabled | 1 | Enables the RTS line when the device is opened and leaves it on. |
Handshake | 2 | Enables RTS handshaking. The driver raises the RTS line when the “type-ahead” (input) buffer is less than one-half full and lowers the RTS line when the buffer is more than three-quarters full. |
Toggle | 3 | Specifies that the RTS line will be high if bytes are available for transmission. After all buffered bytes have been sent, the RTS line will be low. |