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petrus bitbyter · Guest

"ah" <andrew@hanvey82.freeserve.co.uk> schreef in bericht
news:bdjlu0$47i$1@news6.svr.pol.co.uk...
[quote]Hi
Im beginning work on a project which I will need a RS422 to I2C Converter.
Has anyone ever done anything like this?

Andy

Andy,[/quote]

I did. That>s to say it was RS232 to I2C. I used a MAX232 and a PIC16F73.
For RS422 you will need differential drivers/receivers p.e. MC3487/86. For
the processor a PIC16F873 may be a better choice as it>s newer. You will
need to check what protocol is used at the RS422 side. Is it asynchronous,
SDLC, HDLC or another one? You also need to look wether the I2C side has to
be master, slave or both. Unless you have a proper specification of the
protocol and the data format, you will run into a lot of problems.

pieter

Niv · Guest

I thought RS422 was an electrical protocol & I2C a data format protocol?
Niv.

"ah" <andrew@hanvey82.freeserve.co.uk> wrote in message
news:bdjlu0$47i$1@news6.svr.pol.co.uk...
[quote]Hi
Im beginning work on a project which I will need a RS422 to I2C Converter.
Has anyone ever done anything like this?

Andy

[/quote]

Niv · Guest

Yes , that>s fine, but you need to know the TTL async protocol to before it
can be converted to I2C protocol. I asume it>s a UART type message or
something, but one does need to know!
Niv.

"Gary Tait" <taitg@hurontel.on.ca> wrote in message
news:d7utfvo2r4joarjoti10gdfpam8nv8gi53@4ax.com...
[quote]On Sat, 28 Jun 2003 19:48:54 +0100, "Niv" <niv@ntlworld.com> wrote:

I thought RS422 was an electrical protocol & I2C a data format protocol?
Niv.

It is, hence the need for a two staged process. 1: to convert RS422 to
TTL and the other way round. and 2: to convert the TTL Async to I2C,
in a manner you can access either any I2C device, or a particular one
over the serial link.
"ah" <andrew@hanvey82.freeserve.co.uk> wrote in message
news:bdjlu0$47i$1@news6.svr.pol.co.uk...
Hi
Im beginning work on a project which I will need a RS422 to I2C
Converter.
Has anyone ever done anything like this?

Andy

[/quote]

Peter Bennett · Guest

On 8 Jul 2003 21:38:23 -0700, david.chadderton@utas.edu.au (Dave)
wrote:

[quote]Thanks Spehro
Yes i had done that with no results!!(holes all VERY close together)
what i Have discovered is that the protel nc drill file appears to
give its position of the pads in multiple>s or fractions of 0.1" from
the origin so a pad at X 1.1" would be X011. So when it was imported
into kcam it became X000.011, looks like i need to find a multiply by
1000 to get it on the right coord>s this would acount for the
previously thought no results. we will get there
Cheers
Dave
[/quote]
The coordinates in NC drill files have a fixed decimal place, and
normally omit trailing zeros. Usually the format is specified as
"2.3", meaning two digits before the assumed decimal place, and three
after (if there are no trailing zeros.)

Your coordinate of "X011" really means "X 01.100".

(just to add confusion, Gerber photoplot files usually omit leading
zeros!)

--
Peter Bennett VE7CEI
GPS and NMEA info and programs: http://vancouver-webpages.com/peter/index.html
Newsgroup new user info: http://vancouver-webpages.com/nnq

qrk · Guest

On 8 Jul 2003 22:31:59 -0700, mvvijay78@rediffmail.com (Vicky) wrote:

[quote]Hi,
I wanted to know how mechanical elements like dc motor,tachometer etc
are modeled in spectre.Can anyone send me the model.
Vicky
[/quote]
Some good info can be found in a thread that ran thru here recently.
Use google and search for message ID:
PGn4a.130451$ZE.3720189@twister2.libero.it

Mark

A E · Guest

Dieter Tank wrote:

[quote]Hi,

What is easiest way in Orcad 9.2 to layout > 100 similar layout
instances of a circuit on a single pcb ?

The merge command has the drawback that all nodes with the same name
are connected together, not only the 'external nodes' (Off Page
Terminals).

Thanks,

Dieter Tank
[/quote]
Panel up? Ask the fab house.

xxx · Guest

Hi think about this. If you wanted to do an eco on your circuit
how would the cad system know which r1, c5 u3 etc that you
wished to change, since you now have 100 or more instances of each
unique part. ????? Even if it where possible to do what you ask,
why would you want to do it like this. There is a better way.

The task you ask is typically performed on the Gerber Files generated
from your cad data.Unlike cad data Gerber Files contain no electrical
information about the design. I.E no net info or pin info etc. They
are for all intentional purposes nothing more than a graphic
representation of your original cad data.

When you get multiple boards made, the board house typically use
panels of fr4 pcb material. They generate a composite plot of your
design in such a way as to get the best yield from a panel size.

Hope the above info is helpful.

Best Regards...Paul Hesse.

On 6 Jul 2003 09:22:02 -0700, test_haus@yahoo.com (Dieter Tank) wrote:

[quote]Hi,

What is easiest way in Orcad 9.2 to layout > 100 similar layout
instances of a circuit on a single pcb ?

The merge command has the drawback that all nodes with the same name
are connected together, not only the 'external nodes' (Off Page
Terminals).

Thanks,

Dieter Tank[/quote]

Dieter Tank · Guest

Hi again,

Thank you all.

The task to perform is to layout a burn in board for dynamic life test
of microelectronic circuits. Each cell has the burn in socket and R>s
and C>s.

Each cell must be supplied by different voltages and GND.

A duplication with GERBER would not connect these.

After a while, an application note on the Cadence site was discovered.

Their idea was basically:
- back annotate layout to Capture(schematic editor).
Capture holds the layout info in a spread sheet(COMPLOC).
- Duplicate the cell in Capture.
- Within the spread sheet, copy COMPLOC cells data
- change the COMPGROUP number for the cells components.
- ECO the schematic back into layout
- select the new cell by COMPGROUP number
- place the new cell to an appropriate board location.
Relative component locations are kept.

Best regards,

Dieter Tank, www.testhaus.com

test_haus@yahoo.com (Dieter Tank) wrote in message news:<d66dce77.0307060822.283ceb68@posting.google.com>...
[quote]Hi,

What is easiest way in Orcad 9.2 to layout > 100 similar layout
instances of a circuit on a single pcb ?

The merge command has the drawback that all nodes with the same name
are connected together, not only the 'external nodes' (Off Page
Terminals).

Thanks,

Dieter Tank[/quote]

George Patrick · Guest

Mike Shonle wrote:

[quote]I very very highly recommend Pulsonix. I eval>ed a large number of
programs, including the "big ones," which seem to be stuck using 20-year-old
paradigms (one even came up with a black background), and I was amazed at
how many hundreds of times easier Pulsonix is. It>s almost as if it reads
your mind.

I haven>t tried ivex, so I can>t compare it.

-Mike

[/quote]
I LIKE a black background. Easier to see more than 4 layers at a time :)

Jim Thompson · Guest

On Mon, 14 Jul 2003 18:14:12 -0700, George Patrick
<me@pcb-designer.com> wrote:

[quote]Mike Shonle wrote:

I very very highly recommend Pulsonix. I eval>ed a large number of
programs, including the "big ones," which seem to be stuck using 20-year-old
paradigms (one even came up with a black background), and I was amazed at
how many hundreds of times easier Pulsonix is. It>s almost as if it reads
your mind.

I haven>t tried ivex, so I can>t compare it.

-Mike

I LIKE a black background. Easier to see more than 4 layers at a time :)
[/quote]
Black background is probably good for PCB work, but I absolutely
despise colored schematics... schematics should be black lines on a
white background ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC>s and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

For proper E-mail replies SWAP "-" and "_"

Get Lolita Out of Debt... Add Three Inches to Your Mortgage!

Tim Hubberstey · Guest

Jim Thompson wrote:
[quote]
On Mon, 14 Jul 2003 18:14:12 -0700, George Patrick
me@pcb-designer.com> wrote:

I LIKE a black background. Easier to see more than 4 layers at a time :)

Black background is probably good for PCB work, but I absolutely
despise colored schematics... schematics should be black lines on a
white background ;-)
[/quote]
I dunno... I sorta have a fondness for dark blue lines on light blue,
especially if the light blue is kinda motley and smells like ammonia.
;-)
--
Tim Hubberstey, P.Eng. . . . . . Hardware/Software Consulting Engineer
Marmot Engineering . . . . . . . VHDL, ASICs, FPGAs, embedded systems
Vancouver, BC, Canada . . . . . . . . . . . http://www.marmot-eng.com

Kevin Aylward · Guest

Vicky wrote:
[quote]Hi,
I would like to know how to develop a macromodel of asynchronous
presettable JK flip flop in pspice.I want to know how to do
this using only analog components and switches and not digital
primitives.Any help?
Regards
[/quote]
I have complete analogue mosefet versions of jk and dtype models in my
SuperSpice install. There is also an example using them. You can use
these models in psice. There were created by drawing the real circuit
of the devices and using the create subckt function in SuperSpice.

Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT>s and Filter Design.

Terry Pinnell · Guest

"The Data Wraith" <thedatawraith@iprimus.com.au> wrote:

[quote]Hi all,

I am a new ( well sort of ) electronics enthusiast and I would like to start
getting into the design and building of my own circuits. I would like to
fisrt construct them on my computer and test them there as well.

Is there any software, specifically freeware, out there wich can run under
Windows 2000?

Thanks to everybody who choses to reply.
TDW

See my notes and links to some 60 ECAD programs at[/quote]
http://www.terrypin.dial.pipex.com/ECADList.html

Terry Pinnell
Hobbyist, West Sussex, UK

Jim Meyer · Guest

phil.harris@haritec.com (phil harris) wrote in message news:<e3f6c18b.0306301323.3a4c96ed@posting.google.com>...
[quote]
I have a small scientific consulting /design company (mostly
spectrometers and the like). We are just hiring on our first
electronics engineer, and I am going to have to get some pcb design
and schematic capture software.

I think you have the cart before the horse.[/quote]

Interview the candidates first. Then tell them how much money
you are willing to spend to buy them *their* choice of software.
Software is very much a personal item. You wouldn>t buy a supply of
boxer shorts and make your new employee give up his jocky shorts just
to work for you, would you?

Stuff like that only happens in a Dilbert comic strip. Right?

Jim


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