USB/RS-232 Dual Interface, R&S ID 3594.3660.02. For use with R&S HMP2020, HMP2030, HMP4030 and HMP4040. The Hameg HO720 is an USB/RS-232 Dual Interface and an option for Hameg devices. USB Type B male RS-232 9-pol. D sub female USB 2.0 Standard For use with the following units: HM1008-2, H1500-2, HM1508-2, HM2005-2, HM2008, HM5530 and series HMF, HMO, HMP, HMS