DIP Rotary Switch Index Series Description SMR SMT, 10/16 pos., 3 x 3 terminals SRJ 8/10/16 pos., 3 x 2 terminals (except 8 pos.) SRK 10 pos., 3 x 3 terminals SRM SMT, 10 pos., 3 x 2 terminals SRT 10/16 pos., 4 x 1 terminals