scpi_bool_t
SCPI_ChoiceToName(
    const scpi_choice_def_t * options,
    int32_t tag,
    const char ** text);

scpi_bool_t res;
scpi_parameter_t param;
int32_t value = 0;
const char * text;

scpi_choice_def_t bool_options[] = {
    {"OFF", 0},
    {"ON", 1},
    SCPI_CHOICE_LIST_END /* termination of option list */
};

res = SCPI_Parameter(context, &param, FALSE);

if (res && param.type == SCPI_TOKEN_PROGRAM_MNEMONIC) {
    if (SCPI_ParamToChoice(context, &param, bool_options, &value)) {
        SCPI_ChoiceToName(bool_options, value, &text);
        
        printf("choosen value: %s\n", text);
    }
}