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i have a comtool.exe using this i send data on port means transmitt .
so if i check pin 3 i cant get any o/p
but i get o/p at pin 2 (receive)
even i try to transmit why i get data on receive????
i use usb to serial as serial port.
if i want to try to open port in matlab i cant open the port...
'the error is ----
Error using ==> serial.fopen at 71
Port: COM2 is not available. No ports are available.
Use INSTRFIND to determine if other instrument objects are connected to the requested device.
my command is...
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