Software and control for the Magdalena Ridge Observatory interferometer delay lines

The delay lines for the Magdalena Ridge Observatory Interferometer (MROI) will provide remote control of optical delays, of up to 380m with sub-wavelength precision in vacuum. The delay-line prototype is now fully functional, all features having been demonstrated in a 20m long evacuated test rig. We describe the architecture, design and performance of the delay line software: this features distributed real-time control and flexible remote logging of diagnostic data from the delay line hardware components at up to 5 kHz.