National Instruments GPIB RS-232 to IEEE 488 Controller with power cord. Model GPIB-232CT-A.Accessible DIP switches for selecting: S Mode, Data Format and Baud Rate. Voltage: 85-120VAC, fused.The unit runs through its start up routine followed by illumination thePower and Ready LEDs.Connectors for9 pin Dserial and HP 10833B GPIBcables (cables not included). It'sbeen a while since I last used it but it worked fine at that time. "As-is".