Owin,owout
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Posts: 46,084
One way Communiation (example) Commands sent from BS2P to 30 other BS2p'S
all at on time
Dose anyone have experience doing this?
Regards, Folks
all at on time
Dose anyone have experience doing this?
Regards, Folks
Comments
can use these commands to connect with 1-Wire devices, but not with each
other.
You can use open-mode serial communications to connect several Stamps on one
line [noparse][[/noparse]though you may have some loading issues with 30]. Consult the SERIN
and SEROUT section of the manual -- it shows how to connect multiple slaves
to a single master.
-- Jon Williams
-- Parallax
In a message dated 2/12/2003 7:42:01 PM Central Standard Time,
lwindrem@p... writes:
> One way Communiation (example) Commands sent from BS2P to 30 other BS2p'S
> all at on time
>
> Dose anyone have experience doing this?
>
> Regards, Folks
>
[noparse][[/noparse]Non-text portions of this message have been removed]
the MAX232 that will allow multiple devices to share communication lines.
Original Message
> OWIN and OWOUT are for Dallas/Maxim 1-Wire communications. The BS2p and pe
> can use these commands to connect with 1-Wire devices, but not with each
> other.
>
> You can use open-mode serial communications to connect several Stamps on
one
> line [noparse][[/noparse]though you may have some loading issues with 30]. Consult the SERIN
> and SEROUT section of the manual -- it shows how to connect multiple
slaves
> to a single master.
> > One way Communiation (example) Commands sent from BS2P to 30 other
BS2p'S
> > all at on time
> >
> > Dose anyone have experience doing this?
Is it possible to use a transitor connected to a I/O pin to send
the serout signal in this project
I don,t need an answere back from the slave stamp. I have a good
Gnd.(VSS) but only one spare signal
Wire.The reason for the extra drive power is so that I can Keep the
impedence low.
Regards Larry
http://pdfserv.maxim-ic.com/arpdf/MAX1487-MAX491.pdf
Original Message
> I'd be inclined to go with Bill's idea and use an RS485 driver.
> > Is it possible to use a transitor connected to a I/O pin to send
> > the serout signal in this project
> > I don,t need an answere back from the slave stamp. I have a good
> > Gnd.(VSS) but only one spare signal
> > Wire.The reason for the extra drive power is so that I can Keep the
> > impedence low.
-- Jon Williams
-- Parallax
In a message dated 2/12/2003 10:47:18 PM Central Standard Time,
lwindrem@p... writes:
> HI Jon
> Is it possible to use a transitor connected to a I/O pin to send
> the serout signal in this project
> I don,t need an answere back from the slave stamp. I have a good
> Gnd.(VSS) but only one spare signal
> Wire.The reason for the extra drive power is so that I can Keep the
> impedence low.
>
> Regards Larry
[noparse][[/noparse]Non-text portions of this message have been removed]
I do use the Max491 & the LTC491 in my systems, this is a unique
situation,
I already have the system in place boards manufactured wiring in place
and I do
Not have two wires in the system to accommodate RS422 or RS485 . I
only have
A Single wire. See Page 305 in Parallax Manual 2.0 . I Just want to
increase the
Drive power (Figure5.36:
Regards Larry
>all at on time
>I already have the system in place boards manufactured wiring in place
>and I do Not have two wires in the system to accommodate RS422 or RS485 . I
>only have A Single wire. See Page 305 in Parallax Manual 2.0 . I Just want to
>increase the Drive power (Figure5.36:
>Regards Larry
>Is it possible to use a transitor connected to a I/O pin to send
>the serout signal in this project I don,t need an answere back from
>the slave stamp. I have a good
>Gnd.(VSS) but only one spare signal Wire.The reason for the extra
>drive power is so that I can Keep the
>impedence low.
Is one particular Stamp always the SEROUT master, and the other 30
will always be listening with a SERIN?
In that case there is no need for the open baud mode depicted in
figure 5.36. The master stamp can drive the line both high and low
in the driven baud mode. If you need more drive current, then use a
CMOS chip like the CD4050, which has 6 big CMOS inverters in one
package. Put all 6 in parallel to drive a low impedence like a 75
ohms termination.
How far a distance are the Stamps apart and is there danger of noise
pickup on the wire?
-- Tracy
1. The BS2 40P is the master always.
2. The 30 Stamps (Pic12F629) all slaves.
3. I have the BS2 40P 1 (PIC12F629) on a 65' cable 8 con. With RJ45 plugs &
Modular jacks.
4. Yes there is chance of electrical noise
5. The info I send is four single Byte commands. Ect. Dec 0,1,2,3,4
The test setup I have at the present appears to be "BOILER PLATE"
The CMOS Chip sounds like a plan.
I have talked to Chuck he told me you would be the person to talk to.
Thank you for the response
Regards Larry
Is this a "star" arrangement, with each slave off in a different
direction on 65 foot cables, all attached to the central BS2p? Just
for safety, I'd put a resistor of 200 to 1000 ohms in series with the
inputs to each slave PIC.
A CMOS CD4050 buffer or one of the 8-pin RS485 chips that people
suggested would isolate the Stamp from the line and also provide more
drive current. For one wire, you would just use one side the the
'485 driver. Better to use the full differential, but KISS works too
with that one wire. You could use multiple drivers in one package to
divide the 30 slaves into several groups, driven by one Stamp pin.
Put in a checksum or redundancy to allow for noise.
-- Tracy
>Hi Tracey
>
>1. The BS2 40P is the master always.
>2. The 30 Stamps (Pic12F629) all slaves.
>3. I have the BS2 40P 1 (PIC12F629) on a 65' cable 8 con. With RJ45 plugs &
>Modular jacks.
>4. Yes there is chance of electrical noise
>5. The info I send is four single Byte commands. Ect. Dec 0,1,2,3,4
>
>
> The test setup I have at the present appears to be "BOILER PLATE"
>The CMOS Chip sounds like a plan.
>I have talked to Chuck he told me you would be the person to talk to.
>
>Thank you for the response
>
>Regards Larry
>
>
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