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HP-IB INTERFACE/26067B
System Controller
256XA/B
(HP 3000 GIC)
Device A
line Printer
7 loods
1 load
HP-IB Interfoce
intemal
internal
X Installed
Load(s)
2 metre cobl e
o
metre coble
1 Internal Load
lntemcl
internet
Q
Metre Internal Coble
L-.J
LJ
L-.J
~~
8
me
Ires
DEVICE
LOADS
CABLE
SYSTEMGIC
7 Internal
2
Internal
2
Interconnect
DEVICEA
1 Internal
8
Interconnect
HP 25GXA/8
LINE PRINTER
Internal
X
Installed
9
+
X
12 Metres
Loads Total
Coble
Total
Install 3 loads (0 "1 LOAD" and 0 "2 LOAD")
into the 2563A printer I/O driver load sockets.
DRHPIB23
When installing or changing cabling, observe the following recommendations:
Figure 2-3. HP-IB Cable Loading Example
•
Connect multiple devices to the system in a
linear
(serial/ daisy-chain)
configuration
rather
than
in
a
star
(radial/cluster)
conf igura tion.
•
The total length of cable (in metres) used,
must be less than
or equal to the total
number of device loads on the HP-IB bus.
If, For example, a system includes an HP3000, an
HP 2563A Line Printer, and some other device
(DEVICE A) as shown in figure 2-3, the loads
are calculated as shown. For the number of loads
to equal the number
of metres of cable (12
metres), 3 loads need to be added since nine are
already available.
Thus, a 1 load and a 2 load
resistor pack can be installed into the I/O driver
load sockets, from the load storage sockets, to
increase the number of total loads to 12.
•
Connect the device containing the most loads
furthest from the system controller.
•
The maximum
total
cable length
IS
15
metres and total number of loads
IS
15 for
any HP-IB bus configuration.
•
The device containing
the most internal
loads should be connected with the longest
cable.
2-6
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