Many people use bit rate per second (bps) and baud rate interchangeably, which is not correct. Garg, Yih-Chen Wang, in The Electrical Engineering Handbook, 2005 Bit Rate Per Second Versus Baud Rate Currently (as of this writing) it is still a proprietary but well accepted standard. HS 488 has been proposed as an addition to the IEEE 488.1 standard. There are already many instruments that support this new protocol. Since the actual delays increase with longer bus cable lengths, the greatest speed improvement is seen with short cables. HS 488 accomplishes this speedup by removing excessive propagation delays and settling times associated with the standard IEEE 488 handshake (designed for maximum cable length and bus loading). ![]() A fully loaded bus with 15 devices connected by 15 meters of cable has a maximum HS 488 data rate of 1.5 Mbytes/sec (still a 50% speed improvement). However, if all devices on a bus support HS 488, the high-speed handshake is used and overall data rates can run as high as 8 Mbytes/sec (for two devices connected by no more than 2 meters of cable). HS 488 is backward compatible with standard GPIB instruments. ![]() One approach to improving this, developed by National Instruments, is HS 488, a high-speed GPIB handshake protocol that uses the same three control lines as IEEE 488 (DAV, NRFD, and NDAC). ![]() Howard Austerlitz, in Data Acquisition Techniques Using PCs (Second Edition), 2003 HS 488īy today's standards, the IEEE 488 maximum data rate of 1 Mbyte/sec is not very fast.
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