National Instruments 779537-01 PXI Serial Interface Module

National Instruments part number 779537-01 is an identifying part number of the PXI-8431/8, an RS-485/RS-422 Interface module designed for PXI systems. This module delivers high-speed serial communication with a maximum baud rate of 3 Mb per second, making it ideal for demanding industrial and laboratory applications requiring reliable, robust serial communication over long distances. The 779537-01 module supports flexible data transmission, allowing for configurable data bits, with common settings including 5, 7, and 8 bits per packet. For example, standard ASCII transmission can utilize 7 bits, while extended ASCII requires 8 bits, accommodating a range of communication protocols.

This module leverages RS-485 (EIA-485 Standard) technology, an enhancement over RS-422, allowing for up to 32 devices on a single bus, compared to RS-422's limit of 10 devices. This increased capacity makes the 779537-01 particularly suitable for complex systems where multiple devices need to communicate over the same network. Additionally, the module’s RS-485 technology includes enhanced electrical characteristics to maintain signal integrity under maximum load conditions, ensuring consistent and reliable communication across all connected devices. The 779537-01 is designed to support serial communication over cable lengths up to 4000 feet. It is equipped with a 68-position SCSI connector and includes a 68-pin SCSI to 8 DB-9 male connector adapter cable, simplifying system integration.

The module operates on +5 VDC at 925 mA under typical conditions, with a maximum power draw of 1.4 A. Compact and lightweight, the module has physical dimensions of 3.94 x 6.37 inches and a weight of 137 grams, making it easy to integrate into PXI systems without significant bulk.