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.

Nino.
--
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| Antonio (Nino) L. Benci                            |
| Professional Officer, Electronic Services          |
| School of Physics & Materials Engineering          |
| Monash University                                  |
| email: electronic.services@spme.monash.edu.au      |
| T: 61 3 9905 3649. F: 61 3 9905 3637               |
| M: 0414 924 833                                    |
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