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SECTION 4
GPIB OPERATION
4.1
INTRODUCTION
4.1 .l
GPIB Overview
The GPIB interface is a general-purpose
interface bus sys-
tem recognized
by the IEEE (Institute
of Electrical and
Electronics Engineers) in 1975 and is a method of stan-
dardizing
data transfer between measuring instruments
and peripherals.
By building
each controller and periph-
eral device into an interface conforming
to this standard,
it is possible to establish complete hardware compatibil-
ity among devices.
Up to 15 devices may be connected to a single interface
bus, and data transfer is performed by three handshake
lines, enabling reliable data transfer between data send-
ers (talkers) and receivers (listeners)
having
differing
data transfer rates.
4.1.2
Major GPIB Specifications
Overall cable length: 20x1~ maximum
Cable lengths between devices: 4m maximum
Number of devices connectable
(including
a controller):
15 maximum
Transfer method: 3-Line handshake
Transfer rate: 1M bytes/m
(maximum)
Data transfer: S-bit parallel
Signal lines:
Data bus: 8 Lines
Control bus: 8 Lines
(including
DAV, NRF'D, and NDAC handshake
lines and ATN, REN, IFC, SRQ, and EOI
control lines)
Signal/system
grounds: 8 Lines
Signal logic: Negative
True (low-level):
0.8V maximum
False (high-level):
2.OV minimum
4-1
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