BS2SX baud rate limitation...
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Posts: 46,084
After perusing the _new_ Stamp docs (tnx Phil!), I see that the BS2SX
basically chokes on any inbound data rate higher than 4800 baud. My testing
seems to bear this out. Is there _any_ way to get around this? I've got an
application that will require one stamp updating 14 other stamps (which in
turn will update 14 other devices) and 4800 baud is WAY too slow for this.
Am I stuck with this limitation?
tnx.
g.
basically chokes on any inbound data rate higher than 4800 baud. My testing
seems to bear this out. Is there _any_ way to get around this? I've got an
application that will require one stamp updating 14 other stamps (which in
turn will update 14 other devices) and 4800 baud is WAY too slow for this.
Am I stuck with this limitation?
tnx.
g.
Comments
>basically chokes on any inbound data rate higher than 4800 baud. My testing
>seems to bear this out. Is there _any_ way to get around this? I've got an
>application that will require one stamp updating 14 other stamps (which in
>turn will update 14 other devices) and 4800 baud is WAY too slow for this.
>
>Am I stuck with this limitation?
Hi Gene,
It is not so much of a problem when you have one Stamp talking to
another Stamp of the same type. The SEROUT from one stamp
automatically adds extra stop bits. That gives the SERIN Stamp
plenty of time to react.
The problem arises when you ask a Stamp to receive data from a device
like an instrument or a desktop computer that sends the bytes head to
tail with no extra padding.
See
http://www.emesystems.com/BS2rs232.htm
for additional info and tips about the timing of the Stamp serial commands.
-- Tracy Allen
electronically monitored ecosystems
http://www.emesystems.com
> >basically chokes on any inbound data rate higher than 4800 baud. My
testing
> >seems to bear this out. Is there _any_ way to get around this? I've got
an
> >application that will require one stamp updating 14 other stamps (which
in
> >turn will update 14 other devices) and 4800 baud is WAY too slow for
this.
> >
> >Am I stuck with this limitation?
>
> Hi Gene,
> It is not so much of a problem when you have one Stamp talking to
> another Stamp of the same type. The SEROUT from one stamp
> automatically adds extra stop bits. That gives the SERIN Stamp
> plenty of time to react.
>
> The problem arises when you ask a Stamp to receive data from a device
> like an instrument or a desktop computer that sends the bytes head to
> tail with no extra padding.
>
> See
> http://www.emesystems.com/BS2rs232.htm
> for additional info and tips about the timing of the Stamp serial
commands.
Thanks, I'll check it out!
For those interested, this project of mine is in part to support THIS
project: http://deltasoft.fife.wa.us/f15images.html
g.
> like an instrument or a desktop computer that sends the bytes head to
> tail with no extra padding.
>
> See
> http://www.emesystems.com/BS2rs232.htm
> for additional info and tips about the timing of the Stamp serial
commands.
>
Tracy, do you know where I can find the pinout for the DB9 connector that
the BS2 board uses? I need to build a handshake capable serial cable.
Thanks!
g.
You'll find this on page 212 of the manual, version 1.9.
Regards,
Phil.
Original Message
From: Gene Buckle <geneb@d...>
To: <basicstamps@egroups.com>
Sent: Saturday, December 30, 2000 8:41 PM
Subject: Re: [noparse][[/noparse]basicstamps] BS2SX baud rate limitation...
> Tracy, do you know where I can find the pinout for the DB9 connector that
> the BS2 board uses? I need to build a handshake capable serial cable.
>
> Thanks!
>
> g.
>
> You'll find this on page 212 of the manual, version 1.9.
>
Thanks Phil!
g.