two serial ports

Archiver

Markus-

I'll go out on a limb and say "probably". Since device #1 waits to
be prompted before sending data, and device #2 seems willing to wait
for its data, a Stamp may do the job just fine. Can you provide a
little more info on baud rates, data volume/rates, flow control
availability on the devices, etc?

If you're simply wondering whether the Stamp can receive serial data
in one serial mode and then transmit in another serial mode, the
answer is yes...but sequentially, not simultaneously.

Steve

On 22 Jun 01 at 13:00, schmidtoo@m... wrote:

> Can I use the basic stamp with two serial ports as a "protocol
> converter" ?
> One port would connect to a simple device with RS232 connectivity
> that provides a parameter on request. The other port would connect
> to a linux computer expecting a certain data protocol...

Archiver

Can I use the basic stamp with two serial ports as a "protocol
converter" ?
One port would connect to a simple device with RS232 connectivity
that provides a parameter on request.
The other port would connect to a linux computer expecting a
certain data protocol.

Any suggestion would be appreciated.

Thanks, Markus

Archiver

The Stamp might work as a protocol converter for a
reasonably quiet and slow network; however, there are
typically better tools for this at the PC. PC serial
port API's usually allow for bytes to be queued at the
port, waiting to arrive or ship out. The Stamp must be
ready to receive with zero notice, so two-way traffic
would be difficult. I've had trouble getting it to
work with a 9600 baud device that is relatively quiet.

A 20-line loop on my BS2P executes something like 400
times per second, i.e. one loop is 2.5 ms. At 9600
baud, you need to catch a byte every ms, and even at
2400 data integrity might be questionable.

Caveats aside, do try this out if you can run at 2400
baud or less. Let us know the outcome.

Bob Pence


--- schmidtoo@m... wrote:
> Can I use the basic stamp with two serial ports as a
> "protocol
> converter" ?
> One port would connect to a simple device with RS232
> connectivity
> that provides a parameter on request.
> The other port would connect to a linux computer
> expecting a
> certain data protocol.
>
> Any suggestion would be appreciated.
>
> Thanks, Markus
>
>
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