Experimental Physics and
Industrial Control System

Hello Richard,

I was looking for a Modbus solution for a test stand about 4 years ago. Then
I used the  code from Paul, which is tied to the now obsolete MVME335
hardware, but with a 3U serial card SER02 from UK company HM Computing which
uses the same UART. Hence the changes were limited to address and interrupt
mapping. I'm not aware of a development of the Serial Modbus code which is
hardware independent.

If you only require a limited number of transactions to/from an instrument I
would consider the serial support from John Sinclair known as ORNL Serial.
It provides record and device support to create and process Tx and Rx
routines. These are fairly easy to construct the Modbus frames, to send or
retrieve the required data.

There is also ModbusTCP from R.Keitel at TRIUMF which encapsulates the
Modbus frame in a TCP packet. 

I hope this helps. 

Mark Heron
Diamond Light Source

-----Original Message-----
From: [email protected]
To: Richard Dabney; [email protected]
Sent: 6/8/2004 5:08 PM
Subject: Re: Modbus/ASCII or Modbus/RTU (serial)

Richard,
I'm using Modbus in RTU mode over serial.  The 1998-vintage
driver was provided by Bob Dalesio, he may have the latest
source.  I can send you my source, otherwise.  The driver is
written for an out-of-production Motorola MVME335 module.
Around 1998 the board was being manufactured by legacy
supplier GD California. I'm running the driver on the
MVME177 CPU.

-- 
Paul Sichta
Princeton Plasma Physics Laboratory
609-243-3477       FAX 3030




----- Original Message ----- 
From: "Richard Dabney" <[email protected]>
To: <[email protected]>
Sent: Tuesday, June 08, 2004 11:51 AM
Subject: Modbus/ASCII or Modbus/RTU (serial)


> Does anyone have driver/device support for this?
>
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~
> Richard Dabney
> LANSCE-8 Controls & Automation
> M/S H820
> TA-53, Bldg 398 Rm 104
> Los Alamos National Laboratory
> Los Alamos, NM 87545 USA
> 505-665-7860
>
> give me immortality or give me death...
>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~

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