GPIB Pinouts & Interconnections

- information and data for IEEE 488 or GPIB pinouts or pin allocations used for GPIB inter-connections.

GPIB / IEEE 488 Bus Includes:
GPIB / IEEE 488 bus     GPIB operation / commands / protocol     IEEE 488.2     How to Use GPIB / IEEE 488     GPIB / IEEE 488 cables     GPIB / IEEE 488 connectors     GPIB / IEEE 488 pinout / pin connections    

The connections or pinout for the GPIB system is standardised and uses the 24 way Amphenol Type 57 connector.

While some systems have, mainly in the past, used other connectors, the 24 way Amphenol type 57 connector is the one that is by far the most widely used and its connections have been defined as in the table given below.

The GPIB pinout is therefore well standardised and virtually without exception the Amphenol style connector is the one used these days.

GPIB connector pins numbering

The diagram below shows the various pins on the standard 24 way Amphenol type 57 connector in order to identify the different pins for the pinout with their relevant functions.

GPIB / IEEE 488 connector pin numbering / pinout
GPIB / IEEE 488 connector pin numbering / pinout

It is worth noting that the actual pin numbers are written onto the plastic of the connector by the pins themselves. This is always worth checking to make sure orientations are correct and to eliminate errors in interpretation.

GPIB / IEEE 488 connector
GPIB / IEEE 488 connector

GPIB pinout connections

The connections or pinout for the GPIB connector are given in the table below:

GPIB Pinout Table
GPIB Line Name
GPIB Abbreviation
1 Data Input / Output 1 DIO1
2 Data Input / Output 2 DIO2
3 Data Input / Output 3 DIO3
4 Data Input / Output 4 DIO4
5 End or Identify EOI
6 Data Valid DAV
7 Not Ready For Data NRFD
8 Not Data Accepted NDAC
9 Interface Clear IFC
10 Service Request SRQ
11 Attention ATN
12 Shield (Connected to Earth)  
13 Data Input / Output 5 DIO5
14 Data Input / Output 6 DIO6
15 Data Input / Output 7 DIO7
16 Data Input / Output 8 DIO8
17 Remote Enable REN
18 Twisted pair with pin 6  
19 Twisted pair with pin 7  
20 Twisted pair with pin 8  
21 Twisted pair with pin 9  
22 Twisted pair with pin 10  
23 Twisted pair with pin 11  
24 Signal Ground  

It can be seen from the pinout table for the GPIB connections that the DAV, NRFD and NDAC handshaking lines all run with twisted pairs as do IFC, SRQ and ATN.

Again it can be seen from the pinout table that the GPIB connections for the data lines do not have twisted pairs, but are contained within the overall screening of the cable.

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