National Instrument GPIB-140A Photoelectric converter

                            National Instrument GPIB-140A Photoelectric converter

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Question: What is GPIB-140A? Answer: The GPIB-140A is a GPIB Bus Extender that eliminates the cable length and device loading related restrictions that are compulsory by the IEEE 488 standard. It is fully compatible with IEEE 488.1 and IEEE 488.2 standards. As per the IEEE 488 standard, the total length of any GPIB system cannot exceed 20 m. A pair of these GPIB Extenders can reach a total distance of 1 km without any modifications and without affecting the integrity of the user’s GPIB system. This GPIB Extender can support up to 1 km fiber-optic cable. The NI GPIB-140A comes with a buffered transfer technique, making this model one of the quickest GPIB Bus Extenders available. With this model, the user can achieve faster than 2.8 Mbytes while operating in the HS488 protocol. This GPIB Extender can be deployed with minimal effort does not require additional hardware. In typical scenarios, a computer device is connected to a cable extender on one end. On the far end, a GPIB instrument is connected to a similar cable extender. Both cable extenders are then interconnected via a fiber-optic cable. Each NI GPIB-140A continuously monitors GPIB activity and translates GPIB signals into parallel or serial signals for transmission to the receiving extender. The receiving extender receives serial or parallel signals from the transmitting extender and converts them to IEEE 488 signals. The NI GPIB-140A does not necessitate modification in existing software applications because it is software transparent. [1][4]

Question: What is the difference between GPIB-140A and GPIB-140A/2? Answer: The GPIB-140A and GPIB-140A/2 are both members of the National Instruments GPIB-140A Series, but they have different features. The GPIB-140A is a GPIB Bus Extender that supports up to 1 km fiber-optic cable, while the GPIB-140A/2 is a GPIB Extender that utilizes a fiber-optic cable and offers up to 2 km extension in terms of cable length. Without using an extender, GPIB systems cannot be deployed beyond 20 m- a limitation imposed in the IEEE 488 standard. With the GPIB-140A/2, two separate and remotely located GPIB systems can be joined to operate as one GPIB system. The GPIB-140A/2 sends and receives data across the fiber-optic cable by using a different communication protocol. With this extension arrangement, the user can operate two devices on the same bus. This system can help users go beyond the IEEE 488 restriction of 15 devices per a contiguous bus as well. Instead, users can utilize as many as 28 devices on the same system without sacrificing performance or speed. For longer distances, users can connect multiple extenders in series. For additional loading, users can connect the devices in star patterns as well.

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