Can I read the spectra of absorption of a Waters 991 PDA detector via the analog output. It seems to have 2 set of analog output in the rear of detector. Is the first one indicate the wavelenght and the second the absorption? I already developed a acquisition signal and have support to develop analysis software. But I really need the spetra of absorption in real time over the all rage of wavelength (about 2200 to 1000nm). This detector really can provide this and the Waters software provide 3D graph of absorption so the detector can really make it ! But, normally, the detector was link to the PC via an IEEE 448 bus. So I think that signal passes through this bus. But if the first analog output provide me the wavelenght and the second one, the absorption, if the wavelenght is continously sweeping, I can record both signal and create 3D graph of absorption by myself. But can I have these bothe signal via the analog outputs? Also, how can I control the PDA ?