For
HP
Internal Use Only
HP-18
Configuration
Rules
Refer
to
Figure 4-6 for
the
following discussion.
Load Factors
Two load factors
must
be
considered when calculating
the
cabling
parameters
of
the
HP-IB:
1. Internal Load Factor.
The
internal
load factor
of
the
Device
adapter
is seven loads.
2.
External Load Factor.
The
external
load factor
of
the
peripherals is dependent
upon
the
individual peripherals
and
interconnect cables. (Refer
to
HP
3000 Computer Systems
Configuration Guide,
P/N
5954-9354, Appendix 1 for peripheral load values.) A basic rule
for determining load values is you
must
have
at
least one electrical load for each
meter
of
HP-IB cable.
BACKPLANE
HP-IB
PCA
DISK
2
F007
Figure 4-6. HP-18 Configuration Example
HP-IB Cable Length
The
maximum
total
length
of
HP-IB cable
that
can
be
connected
to
a device
adapter
is
15
meters.
When
testing a configuration, use
the
following rules:
1.
No more
than
eight HP-IB devices
per
HP-IB Device
Adapter.
It
is recommended
that
no
more
than
six devices
be
connected.
2.
Maximum of
15
device loads (internal + external).
3. Maximum
HP-IB cable
length
must
not
exceed one
meter
per
device load
(maximum=
15
meters).
4.
Daisy-chain (serial) cabling only
5.
"Star"
cabling
not
supported.
Configuration 4-11
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