Okay, I picked up two things from your last message,
the board has been communicating successfully until recently,
and that you checked your usb-to-serial converter with a
feedback test. Was the feedback test what i call a loopback
connection between tx and rx, pins 2 & 3? Can you do this
test at the TS-7250 Com1 end, that is short pin 2 to 3, and
see if you can communicate without being connected to the
TS-7250? If indeed you can communicate, then I believe the
problem is in the TS-7250 itself, something must have changed
there.
//Tech77man
--- In "prak75_2004" <> wrote:
>
> Hi,
>
> I have connected in such manner (null modem adapter, gender
changer,
> usb-to-serial adapter) and was able to communicate with my TS-7250
> board properly until quite recently. The gender changer is used b/c
> the gender of my usb-to-serial adapter and the output of the null
> modem adapter don't match each other.
>
> Sincerely,
>
> Stanley Lee
>
> --- In Jim Jackson <jj@> wrote:
> >
> >
> >
> >
> > On Tue, 13 Feb 2007, prak75_2004 wrote:
> >
> > > Hi Tech77man,
> > >
> > > I have connected COM1 of the TS-7250 board to my laptop using
a null
> > > modem adapter, followed by a gender changer,
> >
> > This is ringing alarm bells - you shouldn't need a gender changer
> > if the null-modem cable really is a null-modem cable!
> >
> > I suspect you have an ordinary modem cable - with straight thru'
pin
> > connections. A Null-Modem cable is a Special cable with pin
connections
> > Crossed, as people have mentioned here.
> >
> >
> > > and usb-to-serial
> > > connector to my laptop to the correct COM port.
> > > The settings of Hyperterminal is set to operate at a baud rate
of
> > > 115200, with 8N1 and None for Flow control on the correct COM
port, as
> > > instructed in the manual.
> > >
> > > Regards,
> > >
> > > Stanley Lee
> > >
> > > --- In "Jesse" <jessenewton@> wrote:
> > > >
> > > > Okay, the only things I see that you have not clarified in
your
> > > > message is the type of cable (1) it should be a null modem
> > > > cable to Com1 connector, which means that the hardware
control
> > > > signals are connected to each other at pins 4 to 6 and 7 to
8,
> > > > by doing so, tx and rx are enabled and not blocked. (2) is
the
> > > > settings of Hyperterm, it should be set to whatever Com port
> > > > that you are physically connected to, with 8N1 and None for
> > > > Flow control. If all of that is in place, a power-up on the
> > > > TS-7250 board, or pushing the reset button, should allow you
> > > > to see the bootup messages.
> > > >
> > > > //Tech77man
> > > >
> > > > --- In "prak75_2004" <stanigator@>
wrote:
> > > > >
> > > > > Hi,
> > > > >
> > > > > I have trouble seeing redboot messages of my TS-7250
board. I have
> > > > > jumpers 2 and 3 connected, and the power lights are on. I
have
> > > > trouble
> > > > > communicating between the host computer and the
microcontroller
> > > > using
> > > > > Hyperterminal in Windows through using a usb-to-serial
converter.
> > > > > We've checked the usb-to-serial converter using the
feedback test,
> > > > and
> > > > > we've made sure that the transmit/receive pins at the
> > > > microcontroller
> > > > > and the usb-to-serial cable end are connected properly.
I'm not
> > > > sure
> > > > > what else to check to see whether the board is working or
not. Can
> > > > > someone give me some suggestions?
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Stanley Lee
> > > > >
> > > >
> > >
> > >
> > >
> >
>
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