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GPIB/IEEE-488 Signals GPIB is a type of parallel interface that contains data, command, and interface signal lines in one cable. GPIB addressing allows up to 15 devices to share a single 8-bit parallel data bus. The maximum data rate is around 8 MB/s for the latest versions of the standard. Internally, GPIB uses 12 lines for various signals and 12 lines for shield and ground connections. Table 7-6 lists the GPIB signals, and Figure 7-37 shows the pin-out of a GPIB connector. Table 7-6. GPIB signals Signal Pin Function DIO1 1 Data/command DIO2 2 Data/command DIO3 3 Data/command DIO4 4 Data/command EOI 5 End or identity DAV 6 Data valid NRFD 7 Not read for data NDAC 8 Not data accepted IFC 9 Interface clear SRQ 10 Service request ATN 11 Attention Shield 12 Cable shield DIO5 13 Data/command DIO6 14 Data/command DIO7 15 Data/command DIO8 16 Data/command REN 17 Remote enable Ground 18 Ground Ground 19 Ground Ground 20 Ground Ground 21 Ground Ground 22 Ground Ground 23 Ground Ground 24 Ground 238 | Chapter 7: Physical Interfaces
