HP 3335A - HP-IB System Interfacing; HP-IB Connections and Addressing

Section H
8120—1369
8120—1689
~ ;
8120-0698 7
STS -B-4195:
"GE LISTED FOR USE IN TRE UNITED STATES OF AMERICA
Figure 2-1. Power Cables.
2-12. HP-1B Connections.
2-13. Interconnection data concerning the rear panel HP-IB
connector is provided in Figure 2-2. This connector is com-
patible with the -hp- 10631 (A, B, or C) HP-IB Cables. With
the HP-IB system, you can interconnect up to fourteen
(including the controller) HP-IB compatible instruments.
The HP-IB Cables have identical “piggyback” connectors on
both ends so that several cables can be connected to a single
source without special adapters or switch boxes. You can
interconnect system components and devices in virtually
any configuration you desire. There must, of course, be a
Model 3335A
path from the calculator (or other controller) to every
device operating on the bus. As a practical matter, avoid
stacking more than three or four cables on any one connec-
tor. If the stack gets too large, the force on the stack pro-
duces great leverage which can damage the connector
mounting. Be sure that each connector is firmly screwed in
place to keep it from working loose during use (see
CAUTION of Figure 2-2).
2-14. Cable Length Restrictions. To achieve design per-
formance with the HP-IB, proper voltage levels and timing
relationships must be maintained. If the system cable is too
long, the lines cannot be driven properly and the system
will fail to perform. Therefore, when interconnecting an
HP-IB system, it is important to observe the following
rules:
a. The total cable length for the system must be less
than or equal to 20 meters (65 feet).
b. The total cable length for the system must be less
than or equal to 2 meters (6 feet) times the total number of
devices connected to the bus.
2-15. 3335A Listen Address.
2-16. The 3335A contains a rear panel HP-IB Instrument
listen address selection switch. There are five switches
PIN LINE
1 DI91
2 | DIG2
3 DIO3
4 D104
13 DIOS
14 DIG
15 DIO7
16 | DIO8
5 EO!
17 REN
6 DAV
7 NRFD
8 NDAC
9 IFC
10 SRQ
11 ATN
12
18
19
20
21
22
23
24
SHIELD-CHASSIS GROUND
P/O TWISTED PAIR WITH PIN 6
P/O TWISTED PAIR WITH PIN 7
P/O TWISTED PAIR WITH PIN 8
P/O TWISTED PAIR WITH PIN 9
P/O TWISTED PAIR WITH PIN 10
P/O TWISTED PAIR WITH PIN 11
ISOLATED DIGITAL GROUND
THESE PINS
ARE
INTERNALLY
GROUNDED
CAUTION
The
3335A
contains
metric
threaded
HP—1B
cable
mounting
studs
as
opposed
to
English
threads,
Metric
threaded
-hp-
10631A,
B,
or
C
HP--IB
cable
lockscrews
must
be
used
to
secure
the
cable
to
the
instrument,
Identification
of
the
two
types
of
mounting
studs
and
lockscrews
is made
by
their
color.
English
threaded
fasteners
are
colored
silver
and
metric
threaded
fasteners
are
colored
black.
DO
NOT
mate
silver
and
black
fasteners
to
each
other
or
the
threads
of
either
or
both
will
be
destroyed.
Metric
threaded
HP-IB
cable
hard-
ware
illustrations
and
part
numbers
follow.
LOCKSCREW
1390-03560
LONG MOUNTING STUD
0380-0643
SHORT MOUNTING STUD
O380-0644
Figure 2-2. HP-IB Connector.
2-2 Rev. A