Re: [foxboro] Telemetry

    Thanks Alex,

     I believe what I will need is just a slave. Configuring the controller
and remote terminals is done by another group. I feel just fine letting them
maintain that responsibility. We are reading a PH at the wells and I will
have to find out if that is an integer or floating point.

    Loyd Greer
    Great Lakes Chemical

----- Original Message -----
From: "Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>
To: <foxboro@xxxxxxxxxxxxx>
Sent: Thursday, August 15, 2002 3:52 PM
Subject: Re: [foxboro] Telemetry


>
> Number one on the list of things to worry about - The choice of Modbus I/F
> from the I/A Series.
>
>
> There are two for serial links:
>
>
> * The PSS 21H-7G4 B3 <21h7/21h7g4b3.pdf>  Integrator 30, Style B for
> Modbus Devices which speaks pure unadulterated Modbus and
> * The Modbus Device Integrator from Ken Gunston's group which can
> handle almost any Modbus based device.
>
>
> As an example of the differences:
>
>
> * The Integrator 30, Style B for Modbus Devices is a Modbus Master
> only. The MDI can be either Master or Slave.
> * The Integrator 30, Style B for Modbus Devices doesn't handle
> floating point values (only scaled integers (counts) are supported). The
MDI
> can handle 32 bit floating point values.
>
>
> I'll send you a check-off list that I've used before to qualify the choice
> of Modbus interface under separate cover. It is not perfect, but it is
> useful.
>
>
> Regards,
>
> Alex Johnson
> Invensys
> 10707 Haddington
> Houston, TX 77063
> 713.722.2859 (office)
> 713.722.2700 (switchboard)
> 713.932.0222 (fax)
> ajohnson@xxxxxxxxxxx <mailto:ajohnson@xxxxxxxxxxx>
> Shop at the I/A Store and Save on all Invensys Products - www.iastore.com
> <http://www.iastore.com>
> Come to the Invensys Showcase: http://www.invensysshowcase.com/
> <http://www.invensysshowcase.com/>
>
>
> -----Original Message-----
> From: Loyd Greer [SMTP:LGREER@xxxxxxxx]
> Sent: Thursday, August 15, 2002 2:14 PM
> To: foxboro@xxxxxxxxxxxxx
> Subject: [foxboro] Telemetry
>
>
> Hi,
>
>      I am looking at adding 3 Zetron Model 1700 controllers with
> about 120 =
> RTU's to our IA system with a CMP30B interface. I would like to ask
> if =
> anyone has done this with a Zetron controller and if so what
> pitfalls I =
> might look for.=20
>      =20
>      The model 1700 uses modbus RTU protocol. =20
>
>       <<<Loyd Greer>>>
>              Great Lakes Chemical Corp
> =20
>     =20
>
>
>
>
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