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.
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 pinout connections
The connections or pinout for the GPIB connector are given in the table below:
|GPIB Pinout Table|
GPIB Pin No
GPIB Line Name
|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|
|7||Not Ready For Data||NRFD|
|8||Not Data Accepted||NDAC|
|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|
|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|
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.