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'Job Offer - Allen Bradley DH485 Interface!'
1997\02\24@223736 by James Fillmore

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I would like to contract someone to create a Microchip microcontroller
based interface to the Allen Bradley DH485 network. The communication
protocol is documented in one of their publications but I don't have the
time to dedicate to learning it. I have the following requirement / wish
list for this "Interface Microcontroller":

- A Microchip microcontroller (STAMP? or 16C/17C series processor) based
interface to communicate with a SLC500 Programmable Logic Controller (PLC)
at 9.6 or 19.2KBaud.

- Must be able to re-establish communications upon disconnect or error and
must incorporate the protocols CRC.

- Communications to this "Interface Microcontroller" from another
microcontroller to be either RS232 or IC2.

- I would like to be able to send commands to tell the interface
microcontroller which file type and how many words to read or write.

- I would like to be able to communicate in the DH485 network that could
consist of 2 to 31 devices addressed as device numbers 0 - 31.  I would
like to be able to set the "Interface Microcontrollers" device address over
the RS232 or IC2 communication channel.

Would require a breadboarded, working prototype.

If you are familiar with Allen Bradley's DH or DH485 communications and
would like to quote on the above project feel free to call or send e-mail.


spam_OUTJames_FillmoreTakeThisOuTspamXYZTech.com
http://www.XYZTech.com
XYZ Technologies, Inc
5510 Gatewood
Sterling Heights, MI 48310
(810) 939-9715 (fax (810) 939-4514)

1997\02\25@132835 by Ed VanderPloeg

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Hi James,

I'm very interested in this project described here.  Sounds like you want
something to give your PC  a window into the DH485 network, and access to
the devices on that network.  Also sounds like a lot of fun.  I've worked
with Allen Bradley & other PLC's quite a bit in the past, but never with
the DH485 network.  I would love to learn this, however, and this kind of
project seems the perfect way.

I work full time for a regular company doing regular electrical engineering
work (Creo Products) but have my own business on the side (Agile Controls)
doing projects just like this one, mostly with PIC's.  I just finished one
project for a greenhouse ventilation controller, and am in the middle of a
second small project with a third one in the queue.  I've got facilities
for small quantity through-hole manufacturing, in the order or 10's to
100's, if you are considering getting a hand-full made.

I've got a B.S.E. from Calvin College in Grand Rapids, Michigan (ever heard
of the place?), then moved out here to Vancouver in '92, and have been
doing electrical engineering ever since then.

What kind of timeline are you looking at?  I suspect I would be able to
finish something like this in late April, but my other projects are pretty
low priority so maybe some shuffling could happen.

Do you have more details you could send me on what kind of an interface and
commands you are looking for?  Requirements for a project like this would
change dramatically depending how nice of a user interface you are looking
for.  For example, are you interested in nice menus coming from the PIC and
formatted device lists, over the RS232, or will cryptic little commands be
enough?  Any more details on the interface would be great.  Fax or email
would be great.

-Ed VanderPloeg
.....evanderploegKILLspamspam@spam@creo.com
Agile Controls.
ph. (604) 581-4203
fx. (604) 581-0661

At 07:40 PM 2/24/97 PST, you wrote:
{Quote hidden}

1997\02\25@141448 by Shawn Ellis

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Forgive me for asserting my humble opinion here.  I don't mean to rebuke
anyone...  but I think mabye negotiations/resumes shouldn't be sent to the
entire list...  I really do support the posting of job/consulting
opportunities here, but the resulting banter could probably be best served
by staying private.

Thanks,

Shawn

----------
{Quote hidden}

engineering
> work (Creo Products) but have my own business on the side (Agile
Controls)
> doing projects just like this one, mostly with PIC's.  I just finished
one
> project for a greenhouse ventilation controller, and am in the middle of
a
> second small project with a third one in the queue.  I've got facilities
> for small quantity through-hole manufacturing, in the order or 10's to
> 100's, if you are considering getting a hand-full made.
>
> I've got a B.S.E. from Calvin College in Grand Rapids, Michigan (ever
heard
> of the place?), then moved out here to Vancouver in '92, and have been
> doing electrical engineering ever since then.
>
> What kind of timeline are you looking at?  I suspect I would be able to
> finish something like this in late April, but my other projects are
pretty
> low priority so maybe some shuffling could happen.
>
> Do you have more details you could send me on what kind of an interface
and
> commands you are looking for?  Requirements for a project like this would
> change dramatically depending how nice of a user interface you are
looking
> for.  For example, are you interested in nice menus coming from the PIC
and
> formatted device lists, over the RS232, or will cryptic little commands
be
> enough?  Any more details on the interface would be great.  Fax or email
> would be great.
>
> -Ed VanderPloeg
> evanderploegspamspam_OUTcreo.com
> Agile Controls.
> ph. (604) 581-4203
> fx. (604) 581-0661

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