Technical data
7-1
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9050 Peripherals .
Interface Cards
HP-IB Interface - HP 27110A/B
Features
• IEEE-488-1978 compatible.
• Supports
DMA
with two modes of performance: High
Speed
Mode for operation with fixed
discs or other high speed peripherals; Standard Mode for instruments
and
slower peripherals.
• Supports up to
14
device loads.
• Selectable as HP-IB controller or slave.
• Built
in
hardware self-test.
Configuration
Normal switch settings are as follows (note that up
is
the open switch position
and
represents a logic
one).
Sl-S5:
S6:
S7:
S8:
Address
30
(decimal);
Sl
is
least significant
bit;
Address 31
is
illegal
and
causes a
flashing
LED
on the HP-IB card.
System Controller
On; When the switch
is
up the HP-IB
is
the system controller for
the
HP-IB bus.
Normal Speed;
Up for normal speed;
Also
called Data Settling Time Selection switch
as
it
changes the time delay to meet
IEEE
Standard 488-1978 for high speed
devices.
An
in-line resistor pack must also be moved when changing the speed,
if
the
HP-IB
is
the system controller.
Self Test Mode
1;
Down for self test mode
1.
High speed devices can run on a normal speed bus, but run slower than their capacity. Normal
speed devices cannot run
on
a high speed bus. The following are examples of high speed devices:
•
Disc
drives
• 7971A tape drives
• 2608S 2631B/G printers
Connections
Cabling information
is
in
the configuration section.