The CnR IMU interface (shown in HG-1700 configuration) is a PC/104 form factor SDLC interface specifically designed for receiving data from either the Honeywell HG-1700/1900 or HG-9900 series Inertial Measurement Units (IMU). This interface allows for time tagging the IMU data relative to a GPS 1PPS pulse to provide time correlation of inertial and GPS data. Additionally, this interface provides two RS-232/422 (software selectable) high speed serial ports 8 optically isolated digital IO lines and optionally four MIL type hermetic relays.