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National Instruments 779891-01 Serial interface module

The part number 779891-01 from National Instruments is the identifying part number for the NI-9870 Serial interface module. This module has four-ports that supports RS-232 communication standards. The 779891-01 module is designed to be supported by the CompactRIO platform. With the help of RS-232 standard, this module is able to perform high-speed communications over medium distances. The module has flexible baud rates of 921.6 kbps with a maximum module throughput of 1.28 Mbps and a maximum cable length of 250 pF equivalent, ensuring fast and reliable data transfer making it suitable for applications such as Data-logging.

The 779891-01is equipped with data line ESD protection with a voltage of up to 15kiloVolts (human body model) ensuring durability and reliability in demanding conditions. The module’s Mean Time Between Failures (MTBF) is 448,008 hours at 25 °C, highlighting its long-term reliability. The module features safety standards with a maximum RS232 receive signal voltage of 8 Volts continuous and a maximum 25 Volts. It also has isolation voltages of up to 60 Volts DC for port-to-earth ground and withstand voltages of 1000 V RMS up to 2000 meter altitude and 500 V RMS up to 5000 meters altitude, thus ensuring safe applications for various industrial applications.

The serial interface module is designed with an ingress protection rating IP30 and a pollution degree of 2. The 779891-01 has an operating temperature of -40 to 70 degrees celsius and a storage temperature of -40 to 85 degrees celsius, making it suitable for harsher industrial environments. This module is designed to withstand the humidity level ranging from 10% to 90% (non-condensing). This module is lightweight with a weight of 154 grams. 

This module is engineered to withstand operating vibrations of 5 g RMS, 10 Hz to 500 Hz and operating shock of 30 g, 11 ms half sine; 50 g, 3 ms half sine; 18 shocks at 6 orientations. This serial interface module consumes a maximum of 0.5 Watts in active mode and 50 µW maximum in sleep mode. It requires an external supply voltage range of +8 to +28 V DCwith a typical power consumption of 0.5 Watts.