Dear sir(s) / madam(s):
I'm a software developer with 15+ years experience. I have worked with Visual Basic 6 and with Delphi since the years when version 6 was the latest.
If it can be done, the software will be designed to compile and run on the most basic editions of Delphi 7, Standard or even Personal. Third party components will also be avoided whenever possible.
As an alternative (of course if you approve it) I can develop the application using Lazarus/FreePascal. It's an Open Source, cross-platform alternative to Delphi. If all the communication is done via serial port and without requiring Windows-only drivers or features, the application could be easily ported to Linux and Mac OS X. Lazarus/FreePascal.
I'm stipulating the time of delivery in two days on the sake of caution. But if the application could be completed on less time, it will be delivered as soon as it is finished. We can agree on a post-delivery test/bugfix period, during which I will be correcting possible bugs at no cost. I will also add new features if they aren't going to require a substantial rewrite of the code.
Contact me if you require more details. Good luck with your project!