Graeme, Win 32 bit, XP. 18 seconds would be safe. In MinGW got stuck by missing #include .h files... a fixed executable would be much appreciated. Thanks, Ken Conrad At 12:02 AM 5/24/2011, you wrote: >Ken Conrad wrote: >>Yes, the transmissive calibration takes longer than 6 seconds, I would guess >>perhaps 10 >>to 15 seconds. Ok, I'll see if I can wonk myself thru a recompile, with MingW. > >The manual says 18 seconds max for initialisation. > >I can post an executable if you tell me your platform. > >Graeme Gill. >