if you set your mscomm1.inputmode in comInputModeText
the data in the input buffer will be read as text , and if you set the inputmode into cominputModeBinary then you must dim sdata() as byte ,and use
print sdata(lbound(sdata)) to read the first byte,
print sdata(ibound(sdata)+1) to read the next byte
and print ubound(sdata) see what happen (let's say you set the Rthreshold=4 and lineinput=4)
try this see what happened