Thanks for the pointer. One link on your site needs to be updated.

Paul Mcrae's new site is at: http://members.lycos.co.uk/paulmc/frame1.html

Cheers.

Spehro Pefhany wrote:
> At 11:58 PM 6/26/2003 +1000, you wrote:
>
>> I have been asked to install and commission a cryogenic temperature
>> controller. The system uses a mixture of various commercial components
>> to provide closed loop temperature ramping from -200C to +10. Several of
>> the components provide control via a MODBUS interface. We wish to make
>> use of this feature but we have no experience in programming the MODBUS
>> protocol. The physical interface is half duplex RS485, 9600 baud, 8E1.
>>
>> Can any one guide us to some sample code, in either VB, VC++ or Delphi
>> which we could use as a starting point. I have scoured the Web but have
>> found no really good examples. The control system will operate,
>> ultimately, from a Linux system, so ANSI C examples would be preferred.
>>
>> Thanks in advance.
>
>
>
> There's some links on my web page, some of them may even still work.
>
> There's 3 basic types- Modbus (ASCII, serial) and Modbus RTU.
>
> The issue with Modbus RTU (which is more efficient) is the tight timing
> that is required for framing.
>
> Best regards,
>
> Spehro Pefhany --"it's the network..."            "The Journey is the
> reward"
> speff@interlog.com             Info for manufacturers:
> http://www.trexon.com
> Embedded software/hardware/analog  Info for designers:
> http://www.speff.com
>
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