Signal Reading from transducer and reading/sending to valves

I am wondering if anyone can give me an example or explain to me how to read a signal from a transducer and read/send signal to a valve using a C language programming.
Well that is a tall order with so little information.

Several questions spring to mind:

What type of transducer is it.
What type of computer is it connected to - PC, or some toher type.
Asuming a PC what port would it be using - serial/Parallel/USB - some other type of port.

Your question is way too vague to give a sensible answer.
I'm sorry about that..

The transducer is a Differential Pressure Transmitter.
Website: http://www.dwyer-inst.com/htdocs/pressure/Series607Price.cfm
Model: 607-04 or 607-07

And I am to write the C code in an 8-bit Motorola 9S12 Microcontroller using a parallel port.
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