Hello!

I'm trying to make an optical measuring system with an EVI-D31 and a
Logitech Webcam. Firstly I must detect a flashing red LED in a room.
With triangulation I should try to determine the position of the LED.

How can I find out the pan/tilt angle of the EVI-D31??

you can do it the easy way (purchase existing software that does it
already) or the hard way (write your own software to do it). the D30
Visca programming manual will help you with the latter. email me
privately if interested in the former.