ID of the serial interface pin of the addressed Streaming Port instance to which the socket should be attached to. 
- Enumerator: 
- 
| UCS_STREAM_PORT_PIN_ID_SRXA0 | PortA, pin 5.  |  | UCS_STREAM_PORT_PIN_ID_SRXA1 | PortA, pin 6.  |  | UCS_STREAM_PORT_PIN_ID_SRXB0 | PortB, pin 7.  |  | UCS_STREAM_PORT_PIN_ID_SRXB1 | PortB, pin 8.  |