The SL_ESCAPE_PARM_ST structure holds the parameters for individual escape commands. There is one element of the union for each defined escape command.
typedef union
{
struct _query_abcd_bits_st
{
int iVpackNo ;
int iChannelNo ;
int abcd ;
} query_abcd_bits_st ;
struct _set_abcd_bits_st
{
int iVpackNo ;
int iChannelNo ;
int abcd ;
} set_abcd_bits_st ;
} SL_ESCAPE_PARM_ST, * PSL_ESCAPE_PARM_ST ;