角度应用接口；RCN 2311/2511, RCN 2381/2581, RCN 2391F/2591F, RCN 2391M/2591M, RCN 2391P/2591P
角度精度高；RCN 5311/5511, RCN 5381/5581, RCN 5391F/5591F, RCN 5391M/5591M, RCN 5391P/5591P
角度性能提升；RCN 8311/8511, RCN 8381/8581, RCN 8391F/8591F, RCN 8391M/8591M, RCN 8391P/8591P
