The OnDSR event occurs when the DSR signal state is changed.
| OnDSR( | ||
| BOOL On | // DSR signal state | |
| ); | ||
Parameters
 On [in] Determines the state of DSR signal. This parameter can be any of the following values:
| Value | Meaning | 
| TRUE | DSR signal is sent | 
| FALSE | DSR signal is cleared | 
