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8.5 THE GENERAL PURPOSE INTERFACE BUS (GPIB)
The GPIB interface is normally used as an instrumentation bus
i.e. for A.T.E. work and transfers byte-serial (bit-parallel) data to
and from suitably equipped peripherals. This interface can cope with
up to 15 such peripherals over a total cable length of 15 metres.
The 16 signal lines that comprise this bus are as follows:
a} 8 Data lines for the 8-bit parallel data.
b) 3 Data Byte Control lines :-
i) Data Valid [DAV]
)
ii} Ready For Data [NRFD] *) All signals negative
iii) Data Accepted [NDAC] * ) true.
*The prefix 'N' indicates an inhibiting signal.
c) 5 General Interface Management lines:-
i) Attention [ATN]
)
i i) I nterface Clear [I FC]
)
iii) Service Request [SRQ]
)
All signals negative
iv) Remote Enable [REN]
)
true.
v) End-Or-Identify [EOI]
)
8-4
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