The National Instruments GPIB-140B (Part Number: 787723-01) is a robust Bus Extender designed to enhance the communication range of GPIB devices up to 1 kilometer. This durable extender connects seamlessly without necessitating any software modifications, ensuring the integrity of the GPIB system. Utilizing a buffered transfer technique, the GPIB-140B supports data transfer rates of up to 1.1 MB/s in non-HS488 mode and up to 2.8 MB/s in HS488 mode. Configured for versatility, multiple units can be daisy-chained in both star and linear topologies, allowing for a total of up to 28 devices, including extenders. The unit supports both AC and DC standard loads and features a transmission interface unit equipped with optical transmitters and receivers, utilizing ST-style optical cable connectors for secure data transfer. The GPIB-140B operates within a voltage range of 9 V DC to 15 V DC and has a maximum power consumption of 3.0 W (250 mA at 12 V). Designed for reliable performance, it operates effectively in temperatures ranging from 0 °C to 55 °C (32 °F to 131 °F). The GPIB-140B is backed by a three-year warranty, making it a trusted choice for extending GPIB connectivity in industrial automation applications.