Thanks to everyone who have helped. I just got it to work!!!I was so dumb.
After I typed a letter in minicom and it appeared a letter, I was still waiting
for another one to show up. How dumb was I! Finally, I realized it is the echo!
>
> Actually I bought another female to female null converter. So, if hook the
> db9-to-usb converter and null converter together, it should be good as an
> null modem cable, right? By the way, when you say type, does it mean type in
> the minicom? But, I wasn't able to type anything in the minicom.
>
>
>
> --- In Jason Stahls <jason@> wrote:
> >
> > jiangcaoyang wrote:
> > > Hi every:
> > >
> > > I need some help!
> > >
> > > Recently, I bought a serial-to-usb converter cable so that I can connect
> > > my ts-7200 to my computer. Before actually power my board up, I did a
> > > test. I hook up the converter to my linux ubuntu PC. The user guide said
> > > using minicom as the communication tool. So, I followed all the
> > > instructions and set port to /dev/ttyUSB0, baud rate to 9600, 8 data
> > > bits, no parity check, 1 stop bit and no hardware or software control.
> > > (When I typed dmesg | tail. The system says "pl2303 converter now
> > > attached to ttyUSB0". I assume system have found the hardware and assign
> > > it to ttyUSB0?)
> > >
> > > However, after exiting from the minicom setup window and going to the
> > > main windows, it says I am in offline status and I wasn't able to type
> > > anything in the window. I only connected the USB end to my PC and leave
> > > the other end(serial) unconnected. Is it because of this that I get
> > > offline status? or I have wrong setups. How can I test whether the
> > > minicom is properly configured and ready for communication?
> >
> > Ignore the offline bit, that only changes if one of the control lines
> > goes high on the serial port and normally only ever changes if you're
> > connected to a modem. As for the rest, to test the USB->Serial adapter
> > jump pins 2 and 3 together, when you type it should echo back. It
> > sounds like you have a straight-thru cable when you need a null/cross
> > over cable.
> >
> > --
> > Jason Stahls
> >
>
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