National Instruments PCI-1200 - Manual (Page 17)

Chapter 1 Introduction
PCI-1200 User Manual 1-6 © National Instruments Corporation
The mating connector for the PCI-1200 is a 50-position, polarized, ribbon
socket connector with strain relief. National Instruments uses a polarized
(keyed) connector to prevent inadvertent upside-down connection to the
PCI-1200. Recommended manufacturer part numbers for this mating
connector are as follows:
• Electronic Products Division/3M (part number 3425-7650)
• T&B/Ansley Corporation (part number 609-5041CE)