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Chapter 1
Introduction
Hardware Overview
Note
You cannot use the GPIB-140A or GPIB-140A/2 bus extenders to
communicate with either a GPIB-140 or GPIB-140/2 bus extender. The GPIB-140A
and GPIB-140A/2 bus extenders use a different protocol to communicate with each
other across the fiber optic cable.
The GPIB-140A and GPIB-140A/2 are high-speed bus extenders that you can use in pairs with
fiber-optic cable to connect two separate GPIB systems in a functionally transparent manner.
Although the two bus systems are physically separate, as shown in Figure 1-1, devices logically
appear to be located on the same bus, as shown in Figure 1-2.
Figure 1-1.
Typical Extension System (Physical Configuration)
Figure 1-2.
Typical Extension System (Logical Configuration)
PO
WER
LINK
ERR
OR
GPIB-140
FU
S
Printer
(Li
s
tener)
GPIB C
ab
le
Comp
u
ter
(
S
y
s
tem Controller,
T
a
lker,
a
nd Li
s
tener)
GPIB C
ab
le
Fi
b
er-Optic C
ab
le
S
ign
a
l Gener
a
tor
(Li
s
tener)
Unit Under Te
s
t
M
u
ltimeter
(T
a
lker
a
nd Li
s
tener)
GPIB-140A or
GPIB-140A/2
GPIB-140A or
GPIB-140A/2
GPIB C
ab
le
PO
WER
LINK
ERR
OR
GPIB-140
FU
S
Computer
(System Controller,
Talker, and Listener)
Printer
(Listener)
GPIB
Multimeter
(Talker and Listener)
Signal Generator
(Listener)
Unit Under Test
