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'interface PIC to LAN'
2003\02\17@200422 by John Waters

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Hi All,

I have a project that needs to interface a number of PCs to a LAN (running
NT). Each PC is actually used as a data logger that will acquire some
physical data from some sensors. The simpliest way to do is to install into
each PC a data acquistion card, write a program to keep reading the DAS card
and send the data over the LAN (to a destination server), but this solution
is too expensive as I need about 8 to 9 PCs, also, I'm just using the PC to
do some very simple and non time-critical task, what a waste! I'm thinking
of using PIC (or other microcontroller) to replace the PCs, which will make
big saving. However, the major problem is how to interface each PIC to the
LAN. Could someone give me a pointer?

Thanks in advance!
John





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2003\02\18@031107 by Junaid Rizvi

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www.embeddedethernet.com/

John Waters wrote:

{Quote hidden}

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2003\02\18@042520 by Alan B. Pearce

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> I have a project that needs to interface a number of PCs to a LAN (running
> NT). Each PC is actually used as a data logger that will acquire some
> physical data from some sensors. The simpliest way to do is to install
into
> each PC a data acquistion card, write a program to keep reading the DAS
card
> and send the data over the LAN (to a destination server), but this
solution
> is too expensive as I need about 8 to 9 PCs, also, I'm just using the PC
to
> do some very simple and non time-critical task, what a waste! I'm thinking
> of using PIC (or other microcontroller) to replace the PCs, which will
make
> big saving. However, the major problem is how to interface each PIC to the
> LAN. Could someone give me a pointer?

Use a single PC to connect to the LAN, and have it talk to a PIC on a serial
link. That PIC can then talk to other PICs through I2C or some other
suitable link. The PC can be doing the background task you want, as well as
interrogate the PIC's and format the data from the PIC's into what is
required on the LAN if need be.

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2003\02\18@052703 by Wouter van Ooijen

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> However, the major problem is how to interface
> each PIC to the
> LAN. Could someone give me a pointer?

What is your physical layout, especially distance between the data
sources? I would think one PC, talking to one or more PICs, using RS-232
or RS-485.

Wouter van Ooijen

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2003\02\18@070946 by Imro Konkol

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x51 & RealTek ethernet chip
http://web51.hw-server.com/

Imro Konkol

----- Original Message -----
From: "John Waters" <spam_OUTjohn_fm_watersTakeThisOuTspamHOTMAIL.COM>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Tuesday, February 18, 2003 2:03 AM
Subject: interface PIC to LAN


> Hi All,
>
> I have a project that needs to interface a number of PCs to a LAN (running
> NT). Each PC is actually used as a data logger that will acquire some
> physical data from some sensors. The simpliest way to do is to install
into
> each PC a data acquistion card, write a program to keep reading the DAS
card
> and send the data over the LAN (to a destination server), but this
solution
> is too expensive as I need about 8 to 9 PCs, also, I'm just using the PC
to
> do some very simple and non time-critical task, what a waste! I'm thinking
> of using PIC (or other microcontroller) to replace the PCs, which will
make
{Quote hidden}

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2003\02\18@095621 by llile

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face
Yes I can give you a pointer:

1.  Lose the internal interface cards.  They are nothing but trouble.  Low
level analog signals don't belong inside a noisy PC chassis.

2. Get an external interface device that talks RS485.  Distribute these
devices around your area instead of PC's which crash all the time.

3.  RS485:RS232 translators cost under $100

4. Once you are talking RS232, you can talk to a PIC, a PC, or anything in
between.   A PIC could store readings in external memory and regurgitate
them as soon as the operator's PC recovers from it's current crash.

the data acquisition modules I use are called ADAM, and are sold by
ADVANTECH.  There are several competitors that use the same protocol.
Google on them, my web access is down right now or I'd send a link.


-- Lawrence Lile





John Waters <john_fm_watersspamKILLspamHOTMAIL.COM>
Sent by: pic microcontroller discussion list <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
02/17/2003 07:03 PM
Please respond to pic microcontroller discussion list


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       Subject:        interface PIC to LAN


Hi All,

I have a project that needs to interface a number of PCs to a LAN (running
NT). Each PC is actually used as a data logger that will acquire some
physical data from some sensors. The simpliest way to do is to install
into
each PC a data acquistion card, write a program to keep reading the DAS
card
and send the data over the LAN (to a destination server), but this
solution
is too expensive as I need about 8 to 9 PCs, also, I'm just using the PC
to
do some very simple and non time-critical task, what a waste! I'm thinking
of using PIC (or other microcontroller) to replace the PCs, which will
make
big saving. However, the major problem is how to interface each PIC to the
LAN. Could someone give me a pointer?

Thanks in advance!
John





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