to let your vb recieved data string from mcu , some thing you need to know
for mscommand ,
the Rthreshold value mean a mscomm1.oncomm event will happened , when your input buffer count = Rthreshold value ( pc side)
if you need to read more then one byte data in one time , you will have to set your mscomm1.inputlen value to what you need ,and sdata=mscomm1.input will move the data string (base on your inputlen) into sdata ,
so in your case if you need to read 4 bytes data from your mcu at one time , you have to set your mscomm1.inputlen=4, and the RthresHold=4, with there you may recieved and readout datas from pc buffer in which your mcu send
try to remodify your vb program see what happen ,
happe programing
chris