serial communication with 2p40
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Posts: 46,084
Hi,
Can anyone get the 2p40 serin and serout commands to work with baud
rates greater then 9600?
Can anyone get the 2p40 serin and serout commands to work with baud
rates greater then 9600?
Comments
I asked this qustion a few days ago and got no answer. I can get two 2p's to
talk at 115200 right next to each other, with no formatters, etc. I am going
to try it at higher bauds via a bluetooth module, so I'll let you know how
that goes.
Jonathan
www.madlabs.info
Original Message
From: "Green One" <greenish_green@y...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, May 18, 2004 1:32 PM
Subject: [noparse][[/noparse]basicstamps] serial communication with 2p40
> Hi,
> Can anyone get the 2p40 serin and serout commands to work with baud
> rates greater then 9600?
>
>
>
>
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Perhaps you're selecting the wrong parameters in your programs. A few
weeks back I uploaded a template file that includes the proper baud
settings for all BASIC Stamp modules up to 38.4K.
Look for the file: PBASIC_Programming_Template.BS2
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: Green One [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=mVImT7TZ-vUDWAU9Mwmo1MVHlnau7S2j-ZrYLid47nWquX5svfCYs7RtgfFaNgyvCGW2g5JPwhcCndm9kf8]greenish_green@y...[/url
Sent: Tuesday, May 18, 2004 3:33 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] serial communication with 2p40
Hi,
Can anyone get the 2p40 serin and serout commands to work with baud
rates greater then 9600?
you're using the BS2p you should have no trouble with 56K, and I used
38.4K all the time.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: Jonathan Peakall [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=WXmfTZrYTvXAk9ZJJ5sgVgvo1kylLlEilQIzOsuF-EOjjTz-FC9_yLrKE3Me8lABUGxgejZYOPqMvA]jpeakall@p...[/url
Sent: Wednesday, May 19, 2004 12:40 AM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] serial communication with 2p40
Green,
I asked this qustion a few days ago and got no answer. I can get two
2p's to talk at 115200 right next to each other, with no formatters,
etc. I am going to try it at higher bauds via a bluetooth module, so
I'll let you know how that goes.
Jonathan
www.madlabs.info
Original Message
From: "Green One" <greenish_green@y...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, May 18, 2004 1:32 PM
Subject: [noparse][[/noparse]basicstamps] serial communication with 2p40
> Hi,
> Can anyone get the 2p40 serin and serout commands to work with baud
> rates greater then 9600?
age, when 19,200 baud was the most anyone needed.
The 'higher' baud rates (like 115,200) push the
limits of some MAX232 type drivers -- the MAXIM
IC does not work well at that rate. This also
pushes the limits of the cableing -- long
cable runs (longer than 10 feet or so) don't
work very well. (Note you CAN use RS485 drivers
at these rates, which should be good to 4000
feet at 115,200 baud)
(What happens to the 232 signal
is that the capacitance of the
long cable filters the high frequency
components out. This makes your nice
115,200 baud square wave look like
a more pure sine wave at the reciever
-- and some single bits become little
'bumps' in the signal, and never rise
high enough to be recognized by the reciever).
If you don't use a driver, then there is a
definite limit to how far apart the two BS2
modules can be, and what kind of
cable you use to connect them. On the same
board shouldn't be a problem, though.
--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> I do routinely. There are no problems with BS2p baud rate
generation.
> Perhaps you're selecting the wrong parameters in your programs. A
few
> weeks back I uploaded a template file that includes the proper baud
> settings for all BASIC Stamp modules up to 38.4K.
>
> Look for the file: PBASIC_Programming_Template.BS2
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
>
>
>
Original Message
> From: Green One [noparse][[/noparse]mailto:greenish_green@y...]
> Sent: Tuesday, May 18, 2004 3:33 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] serial communication with 2p40
>
>
> Hi,
> Can anyone get the 2p40 serin and serout commands to work with
baud
> rates greater then 9600?
Thanks, that's what I needed to know. Now if I could just get the EB500
changing baud rates, I'll be able to see how fast I can go. One nice thing
about the EB500s is that the serial lines are very short, no cable to speak
of, and then the EB500 deals with error checking. So hopefully I can push
it...
Jonathan
www.madlabs.info
Original Message
From: "Allan Lane" <allan.lane@h...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, May 19, 2004 7:08 AM
Subject: [noparse][[/noparse]basicstamps] Re: serial communication with 2p40
> The RS-232 'standard' was designed in an earlier
> age, when 19,200 baud was the most anyone needed.
>
> The 'higher' baud rates (like 115,200) push the
> limits of some MAX232 type drivers -- the MAXIM
> IC does not work well at that rate. This also
> pushes the limits of the cableing -- long
> cable runs (longer than 10 feet or so) don't
> work very well. (Note you CAN use RS485 drivers
> at these rates, which should be good to 4000
> feet at 115,200 baud)
>
> (What happens to the 232 signal
> is that the capacitance of the
> long cable filters the high frequency
> components out. This makes your nice
> 115,200 baud square wave look like
> a more pure sine wave at the reciever
> -- and some single bits become little
> 'bumps' in the signal, and never rise
> high enough to be recognized by the reciever).
>
> If you don't use a driver, then there is a
> definite limit to how far apart the two BS2
> modules can be, and what kind of
> cable you use to connect them. On the same
> board shouldn't be a problem, though.
>
> --- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
> wrote:
> > I do routinely. There are no problems with BS2p baud rate
> generation.
> > Perhaps you're selecting the wrong parameters in your programs. A
> few
> > weeks back I uploaded a template file that includes the proper baud
> > settings for all BASIC Stamp modules up to 38.4K.
> >
> > Look for the file: PBASIC_Programming_Template.BS2
> >
> > -- Jon Williams
> > -- Applications Engineer, Parallax
> > -- Dallas Office
> >
> >
> >
Original Message
> > From: Green One [noparse][[/noparse]mailto:greenish_green@y...]
> > Sent: Tuesday, May 18, 2004 3:33 PM
> > To: basicstamps@yahoogroups.com
> > Subject: [noparse][[/noparse]basicstamps] serial communication with 2p40
> >
> >
> > Hi,
> > Can anyone get the 2p40 serin and serout commands to work with
> baud
> > rates greater then 9600?
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
>