emcfan_reg_by_name
start_reg = emcfan_reg_by_name(product_id, product_family, argv[3]);
end_reg = emcfan_reg_by_name(product_id, product_family, argv[4]);
start_reg = emcfan_reg_by_name(product_id, product_family, argv[3]);
EXTERN int emcfan_reg_by_name(uint8_t, int, char*);