Problem With Auto Update Control

Hi.
I am new in using Access, so forgive me if the solution for my problem is easy.

I wrote for customers a little program, which receives data via RS-232 serial port and then place readed data into MS Access database. After i put the data into field in table (database, table and field are set in my program), there is some kind of script that continue the process of data manipulation.

The problem is, that customers want to activate that script automatically, when i place data in the field. So, i made a form, which contains bound control to this field. Every 2 seconds i am refreshing this form, so when i change the data in the table field, i can see the change in the form control. Now, how can i make the OnChange event to work, when the data changes? I tried to do it, but nothing happens, except if i am writing from the keyboard something directly in the form.

Can this be done and if, how must i do it, so when a new data arrives to run automatically the client script?

Thank you in advance