Re: Interfacing two devices using RS-232 ports
- From: Art <nothere@xxxxxxxxx>
- Date: Tue, 12 Jul 2005 23:27:18 GMT
jc@xxxxxxxxxxx wrote in news:1121017460.120775.252280
@g44g2000cwa.googlegroups.com:
> Hi. I need to interface two devices, both offering a RS-232 port. The
> general idea is to read the output (weight) from an electronic scale
> using it's RS-232 port, compose a string (containing control codes and
> the message to be printed) and send the string to an industrial ink-jet
> printer. We are talking about 1 reading/printing per minute. Follows
> a simple block diagram:
>
> |----------------------|
> Scale -> | Protocol converter | -> Ink-jet system
> |----------------------|
> ^
> |
> Product sensor
>
> I am borrowing the "protocol converter" concept from a product named
> PPC (Programmable Protocol Converter,
> http://www.kksystems.com/english/html_files/product_pages/ppc.htm) form
> KK Systems.
>
> Assuming that I have both the scale and printer techincal information
> (that is, their protocol definition), I request your comments to
> determine good options for the "protocol converter" system. "Good"
> refers to simple and economical yet robust solutions since this is
> intended for use in an industrial environment.
>
> So far I have found the KK product mentioned before, and I am also
> considering using a low power (both in terms of power consumption and
> processing power) PC/104 solution.
>
> As you might have already guessed, reading the output (I am considering
> a few 10-20 bytes long per scale reading) and generating the string
> (which should be around 20-30 characters long including the scale
> reading) at one per minute does not require a superscalar processor :)
> A 25 MHz processor should be more than enough, I am considering this
> speed because is the smallest systems I have found so far.
>
> For your ideas, thanks in advance.
>
>
try jkmicro.com
they have range of inexpensive embedded DOS boards for as low as $69 with
3 serial ports (Flahslite186). Dev kit with Borland C++ is only $99. I
use them in number of my projects, good service.
arthur
klocworx AT shaw DOT ca
.
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