W1 of GET_LINE_CODING command.
| GET_BDATA_BITS | The value of bCharFormat set by software which is requested by GET_LINE_CODING command. |
| GET_BPARITY_TYPE | The value of bParityTpye set by software which is requested by GET_LINE_CODING command. |
| GET_BCHAR_FORMAT | The value of bDataBits set by software which is requested by GET_LINE_CODING command. |