Table 3-3 - GPIB (IEEE-488) Connector and Pin Assignments
Pin Signal Description
1 to 4 DI01 to DI04 Data lines.
5 EOI End or Identify. The Talker uses the EOI to mark the end of a message string,
while the Active Controller uses it to tell devices to identify their responses
in a parallel poll.
6 DAV Data Invalid. Indicates the data lines are stable and can be sampled.
7 NRFD Not ready for data. Used by receiving devices.
8 NDAC Not data accepted. Used to signal when a device accepts data.
9 IFC Interface clear. Used by the Controller to initialize the bus.
10 SRQ Service request. Used by a device to request service from Controller.
11 ATN Attention. TRUE during Controller use of the data lines.
12 Shield
13 to 16 DI05 to DI08 Data lines.
17 REN Remote enable. Used by Controller to enable selected devices.
18 GND (w. DAV)
19 GND (w. NRFD)
20 GND (w. DAC)
21 GND (w. IFC)
22 GND (w. SRQ)
23 GND (w. ATN)
Return lines in twisted pairs with the signal lines indicated
24 Signal Ground Ground return line for the data.
2
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