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a3821455
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1992-05-09
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HP-IB* Interface for HP 1000 A-Series Computer Systems, Technical Data
For HP 1000 A-Series Computer Systems
Product Number 12009A
The HP 12009A HP-IB* (* The Hewlett-Packard Interface Bus (HP-IB) is
HP's implementation of IEEE Standard 488-1978: "Digital Interface for
programmable instrumentation" and identical ANSI Standard MC 1.1. The
term "HP-IB" is also used to identify Hewlett-Packard instruments
conforming with this standard.) Interface provides for connection of up
to 14 Hewlett-Packard Interface Bus compatible devices to HP 1000
A-Series computers or systems. HP-IB compatible devices include flexible
and hard disk drives, printers, magnetic tape drives, plotters, graphics
digitizers, and an extensive list of measurement instruments.
Features
o Interface to low-cost peripherals
o Capacity of up to 14 instruments
o Simple software control of HP-IB based instrumentation systems
o Built-in DMA capability for optimum I/O efficiency
o Burst transfer rates to 940 Kbytes/second
o Concurrent operation of multiple HP-IB buses under control of the
RTE-L/A operating system
o I/O driver support with RTE-XL, RTE-A, RTE-L operating system
[Figure 1 (HP-IB Interface diagram) Caption: none]
HP-IB Capabilities
The HP 12009A HP-IB interface connects to the signal lines shown in
Figure 1, acting as DEVICE A. Eight bidirectional data bus lines carry
coded messages in bit-parallel-byte-serial to/from other devices on the
bus, with each byte transferred from one "talker" to one or more
"listeners." Data is exchanged asynchronously using interface messages
to set up, maintain, and terminate an orderly flow of device-dependent
messages. Three data byte transfer control lines control the transfer of
each byte of coded data on the eight data lines. The five general
interface management lines ensure on orderly flow of information within
the HP-IB.
The HP-IB functions of the HP 12009A interface are largely embodied
in a CMOS/SOS LSI integrated circuit chip that works with the I/O master
processor LSI chip and circuits to manage HP-IB control and
communications.
Functional Specifications
Capacity
HP 7906H/7910HR Disks per HP 12009A Interface: Up to two, maximum,
in addition to single or dual flexible disk
Other HP-IB Devices/ Interface: Up to 14
Switch-Selectable Operating Modes
High-speed Mode: Selects operation at data rates to 940
Kbytes/second, maximum. Only 7 high-speed devices plus the
HP 12009A allowed on bus.
Normal Mode: Selects operation at data rates to 500 Kbytes/second,
maximum; 14 normal speed devices may be on the bus.
Matching Requirements: All devices connected to the same bus must be
compatible with the selected mode. For that reason, separate
HP 12009A interfaces will be required to interface both high-speed
mode and normal mode devices to the same A-Series computer or
system.
System Controller Mode: A two-position switch enables HP 12009A
operation as system controller (supported by RTE-L/XL/A) or
disables such operation (not supported by RTE-L).
Bus Characteristics
Bus Signal Lines:
DIO 1-8 Data I/O Lines
1 through 8
DAV Data Valid
NRFD Not Ready for
Data Accepted
IFC Interface Clear
ATN Attention
SRQ Service Request
REN Remote Enable
EOI End or Identify
Logic Levels, Line Drivers, Line Terminations, and Line Receivers:
All characteristics conform to IEEE Standard 488-1978.
Maximum Cable Length for Normal-Mode Operation: 2 meters (6.5 ft)
per device connected, with a 20-meter (65 ft) total length. The
maximum number of devices is accommodated by interconnection using
shorter than maximum cable length.
Maximum Cable Length for High-speed Operation: 2 meters (6.5 ft) per
device connected, with 15-meter (48.75 ft) total length.
Additional load resistors, provided with the interface, are
required.
Direct Memory Access (DMA) Operation
The HP 12009A can directly access computer memory under control of its
I/O master processor regardless of how many other interfaces in the
system are also accessing memory via DMA.
Transfer Rates
High-speed Mode: Up to 940 Kbytes per second via Direct Memory
Access when HP-IB interface is plugged into the highest priority
I/O slot (next to the central processor board) in the cardcage.
Normal Mode: Up to 500 Kbytes per second via Direct Memory Access.
Configuration Information
Computer and System Compatibility: The HP 12009A HP-IB Interface is
compatible with all HP 1000 A-Series Computers and Systems.
Software Support: The HP 12009A interface is supported by RTE-L/XL/A
interface driver ID.37. Use of Hewlett-Packard disk memories and
printers with the HP 12009A interface is supported by RTE-L device
drivers DD.30 and DD.12 respectively, which work with interface
driver ID.37.
Diagnostic Support: A diagnostic for the HP 12009A interface is
provided in the HP 24612A Diagnostic Package.
Installation: Set interface card switches to select (or unselect)
operation as bus controller, normal or fast settling time,
appropriate HP-IB address and control functions and appropriate
I/O address select code; turn off power to the computer; plug the
interface into the computer backplane*; connect the bus cable from
the interface to HP-IB devices; integrate the interface driver
into the operating system if that was not done previously.
Note: To achieve maximum data rate in high-speed mode, the HP-IB
interface must be plugged into the cardcage slot next to the central
processor; I/O address setting of the interface select code switches is
independent of the interface card's position in the computer backplane.
Electrical Specifications
Direct Current Requirements: 2.1 A (+5 V), 0.084 A (+12 V)
Physical Characteristics
Dimensions: 28.9 cm long by 17.2 cm wide by 0.16 cm board thickness
(11.48 in by 6.75 in by 0.063 in) , with 1.0 cm (0.4 in)
top-of-board parts clearance and 0.5 cm (0.2 in) beneath-board
clearance.
Weight: 710 grams (25 oz) with HP-IB cable
Ordering Information
The HP 12009A Interface includes:
12009-60020 HP-IB Interface Card
12009-60014 HP-IB 2-meter RFI Filter Cable
12009-90001 Reference Manual
HP 12009A Option
001 Replaces 12009-60014 2-meter cable with 12009-60015 4-meter
RFI Filter Cable.
From HP Networking Communications Specifications Guide,
5091-3821E, 9205, p 455
Associated files: la3821dj.gal, la3821dj.plt
HP-IB* Interface for HP 1000 A-Series Computer Systems, Technical Data