National Instruments 781673-01 CANopen Interface Module 

National Instruments part number 781673-01 is an identifying part number for the NI-9881, a CANopen Interface Module. The NI-9881 is a 1-port C series CANopen Interface Module with a maximum baud rate of 1 Mbps. It is a high-speed CANopen interface module which is utilized for developing CANopen applications within LabVIEW software on CompactRIO hardware. 

CANopen serves as the application layer atop the CAN physical layer, commonly employed in industrial automation settings. Initially designed for motion-oriented machine control networks like handling systems, CANopen now finds utility across diverse sectors such as medical equipment, off-road vehicles, maritime electronics, public transportation, and building automation. 

Adhering to CiA-DS 301 standards, the NI-9881 facilitates the transmission and reception of process data objects (PDOs) and service data objects (SDOs). Notably, the device is exclusively compatible with CompactRIO systems. Part 781673-01 offers software-selectable bus termination for Hi-Speed CAN transceivers. Users can activate 120 Ω termination resistors between CAN_L and CAN_H using an API call. To connect to a CAN bus, it includes one 9-pin D-Sub male connector. The port of the NI 9881 contains two common pins, which are internally linked to the isolated reference of the module, serving as the reference ground for both CAN_L and CAN_H. This device supports a wide range of voltage inputs for maximum flexibility and compatibility. With a port-to-COM voltage spanning from -27 V DC to +40 V DC within Measurement Category I, it ensures safety and reliability in various environments. 

Additionally, its external power supply (Vsup) accommodates inputs ranging from +9 V DC to +30 V DC, providing ample power options for efficient operation. The part number 781673-01 for NI-9881 doesn't have a conformal coating, unlike the other part numbers available.