HOW 2 INTERFACE WITH A TAXIMETER. I WANT TO RECIEVE SUM DATA FROM IT.
THANKS AND BEST REGARDS.
Why do you feel that there is one magic standard interface that any random taximeter is using?
Call the manufacturer, and give them a very, very good reason why they should send documentation to you. Start by describing how your work would increase their sales of taximeters by your value-added service.
As an alternative - start the reverse-engineering efforts.