hi hitesh sDeviceObj = serial('COM1'); fopen(sDeviceObj); PicoDeviceObj = icdevice('PS3000a_IC_drv.mdd'); connect(PicoDeviceObj); working fine: instrfind, instrfindall, instrfind('Type','serial'), delete(instrfind('Type','serial')) not working: instrfind('Type','scope'),delete(instrfind('Type','scop...