Could not download the program!!
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Hi,
I just changed the SOUT pin from physical pin 1 to pin 5
inorder to avoid the echo!! and I tried to download the program
and it dosent!! it says basic stamp not found!!
where would I have gone wrong???
Sumana,
I just changed the SOUT pin from physical pin 1 to pin 5
inorder to avoid the echo!! and I tried to download the program
and it dosent!! it says basic stamp not found!!
where would I have gone wrong???
Sumana,
Comments
It uses the output voltage of the PC's transmit
pin to enable it to send back to the PC. A
side effect of this is that everything sent to
the Stamp comes back on the PC's RX pin -- and
the Stamp can only 'talk' reliably while the
PC is 'silent'.
Also, the Stamp ONLY will support being
programmed / downloading
on its pin 1. There is a special boot-loader
for it that expects the PC to talk to it on
pin 1 -- you cannot change this.
You can use other pins for your own BS2 program
to listen and talk to other 232 devices.
To listen (SERIN, Receive) you'll need a
22 KOhm resistor in series with the line.
This enables the Stamp's voltage limiting
diodes to 'clip' the signal to TTL.
To Transmit, you'll need some Maxim-ic
MAX232 compatible chip to produce the
+- 10 volt RS-232 signal. If you do this,
you might as well use the MAX232 to convert
the receive signal to TTL also.
--- In basicstamps@yahoogroups.com, "sumanagarikipati"
<sumanagarikipati@y...> wrote:
> Hi,
>
> I just changed the SOUT pin from physical pin 1 to pin 5
> inorder to avoid the echo!! and I tried to download the program
> and it dosent!! it says basic stamp not found!!
> where would I have gone wrong???
>
> Sumana,
learn more about this!! like the actual circuit!!
Thanks
Sumana.
---
In basicstamps@yahoogroups.com, "Allan Lane" <allan.lane@h...>
wrote:
> The physical pin-1 has a pseudo-232 driver on it.
> It uses the output voltage of the PC's transmit
> pin to enable it to send back to the PC. A
> side effect of this is that everything sent to
> the Stamp comes back on the PC's RX pin -- and
> the Stamp can only 'talk' reliably while the
> PC is 'silent'.
>
> Also, the Stamp ONLY will support being
> programmed / downloading
> on its pin 1. There is a special boot-loader
> for it that expects the PC to talk to it on
> pin 1 -- you cannot change this.
>
> You can use other pins for your own BS2 program
> to listen and talk to other 232 devices.
> To listen (SERIN, Receive) you'll need a
> 22 KOhm resistor in series with the line.
> This enables the Stamp's voltage limiting
> diodes to 'clip' the signal to TTL.
>
> To Transmit, you'll need some Maxim-ic
> MAX232 compatible chip to produce the
> +- 10 volt RS-232 signal. If you do this,
> you might as well use the MAX232 to convert
> the receive signal to TTL also.
>
>
> --- In basicstamps@yahoogroups.com, "sumanagarikipati"
> <sumanagarikipati@y...> wrote:
> > Hi,
> >
> > I just changed the SOUT pin from physical pin 1 to pin 5
> > inorder to avoid the echo!! and I tried to download the program
> > and it dosent!! it says basic stamp not found!!
> > where would I have gone wrong???
> >
> > Sumana,
_basic_stamp.asp
Download the PDF under "Basic Stamp 2sx Module Schematic".
Trace the circuits on pin 1 and pin 2.
Note VSS is GROUND, VDD is +5 (nominal), VIn is 6V to 12V.
Note that SIN is connected through a 4.7 KOhm resistor to
SOUT. This allows the voltage from the PC SIN (PC TX)
to be used by the Stamp in its SOUT signals (PC RX).
Since the Stamp can only talk, or recieve, not both at
the same time, this works OK, but it does mean every
byte from the PC is echo'ed back to its RX pin.
Note the www.maxim-ic.com, MAX3110 chip is a UART
which can easily be used with the Stamp, and has
its own on-chip no-capacitor MAX232 compatible
drivers and receivers -- if you want to implement
more than the one port, or implement a port that
does not echo.
--- In basicstamps@yahoogroups.com, "sumanagarikipati"
<sumanagarikipati@y...> wrote:
>
> Thanks for the message!! Could you please give me a link so that
> learn more about this!! like the actual circuit!!
>
> Thanks
> Sumana.
>
> ---
>
> In basicstamps@yahoogroups.com, "Allan Lane" <allan.lane@h...>
> wrote:
> > The physical pin-1 has a pseudo-232 driver on it.
> > It uses the output voltage of the PC's transmit
> > pin to enable it to send back to the PC. A
> > side effect of this is that everything sent to
> > the Stamp comes back on the PC's RX pin -- and
> > the Stamp can only 'talk' reliably while the
> > PC is 'silent'.
> >
> > Also, the Stamp ONLY will support being
> > programmed / downloading
> > on its pin 1. There is a special boot-loader
> > for it that expects the PC to talk to it on
> > pin 1 -- you cannot change this.
> >
> > You can use other pins for your own BS2 program
> > to listen and talk to other 232 devices.
> > To listen (SERIN, Receive) you'll need a
> > 22 KOhm resistor in series with the line.
> > This enables the Stamp's voltage limiting
> > diodes to 'clip' the signal to TTL.
> >
> > To Transmit, you'll need some Maxim-ic
> > MAX232 compatible chip to produce the
> > +- 10 volt RS-232 signal. If you do this,
> > you might as well use the MAX232 to convert
> > the receive signal to TTL also.
> >
> >
> > --- In basicstamps@yahoogroups.com, "sumanagarikipati"
> > <sumanagarikipati@y...> wrote:
> > > Hi,
> > >
> > > I just changed the SOUT pin from physical pin 1 to pin 5
> > > inorder to avoid the echo!! and I tried to download the program
> > > and it dosent!! it says basic stamp not found!!
> > > where would I have gone wrong???
> > >
> > > Sumana,