Series 500
110
The Series
500
vap communicates to external devices
through a specially designed
va channel
and
interface
cards. This combination of
va
Processors,
va
channel
and
interface cards conforms to the
HP
channel VO
(HP-CIO) standard.
These interface cards can receive
and
transmit data in
multiple-word ''bursts.'' The
VOP also communicates
with the Series
500
CPU in this fashion. These "bursts"
permit communication overhead to be spread over a
number
of data
words
thereby increasing the capacity of
the system to handle half-word or byte-oriented
VO
transactions.
UP-IB
(UP
27110A)
The HP-IB Interface Card for the Series
500
allows
connection of
up
to
14
HP-IB compatible devices. These
devices include flexible
and
hard
discs, printers, plotters,
magnetic tape drives, tablets
and
an
extensive list of
instruments.
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
and
Medium Speed for
instruments
and
slower peripherals.
• Supports
up
to 7 high-speed devices or
14
standard-speed devices.
• Selectable HP-IB controller or slave capabilities
and
parallel poll capabilities.
• Built-in hardware self-test.
Operation
Eight bidirectional data bus lines carry coded
messages in bit-parallel, byte-serial form 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 transfer control
lines control the transfer of each byte of coded data
on
the eight lines. Five general interface management lines
ensure the orderly flow of information.
Supported HP-IB functions as detailed in
IEEE
Standard 488-1978 are: C1-C5, SRI,
RL1,
PP1, DC1,
DT1,
SH1, AH1,
T5,
TE5,
L3,
LE3.
Cable Specifications
Maximum cable length for Standard Mode operation
is
2m (6.5 ft.)
per
device connected, with a 20m
(65
ft.)
total length. The maximum
number
of devices is
accommodated
by
interconnections using
shorter-than-maximum cable length.
Maximum cable length for High Speed operations is
1m (3.2
ft.)
per
device connected with a 15m (48.8 ft.)
total length.
Internal
UP-IB
(Model 550)
The Series
500
Model
550
features a built-in, standard
speed HP-IB interface.
It
is recommended for general
purpose HP-IB applications at transfer rates of
300
Kbytes/sec. Although it can be
used
to control the root
disc, it is not recommended because of loss of
performance. The feature set
supported
is
IEEE-1978
compatible.
6
General Purpose
110
(UP
27112A)
The 27112A General Purpose VO Interface is designed
to provide multi-purpose
8-
or 16-bit parallel
communication with Direct
Iv1emory
Access between
external devices
and
the Series
500
using the standard
archi tecture.
Features
• Choice of programmable operating modes (clocked or
transparent) for ease of use with instrumentation.
• Supports +
5V
on
all
input
and
output
signals, plus
an
optional +
12V
level
on
output
signals.
• Programmed data detection for either positive true or
ground
true levels.
•
Independent
16-bit
input
and
output
lines
and
storage
registers.
• Two control
and
two status lines.
Operation
The GP-IO Interface supports either
8-
or 16-bit
transfers without byte packing
on
the 8-bit transfers.
All
data is latched in a 16-bit
input
or
output
data register.
This interface supports two
modes
of operation:
Clocked
and
Transparent.
\tVith
the Clocked mode, data
may be latched externally with a rising or falling clock
pulse, or internally with a Series
500
BASIC READ
command. The
Transparentmode
is useful for
communicating with
one
or several asynchronous
external devices. While in this mode, all data is read
and
sent programmatically
and
independent
of hardware
handshakes.
In addition,
all
input, output, status
and
control lines
can be configured independently to detect a true
condition
on
a high or low voltage level. Included in this
set of signals are two control
and
two status lines which
are latched
and
available to the user for unique
communication requirements.
Line Characteristics
PDIR
DIN
DOUT
STS
CTL
PFLAG
PCNTL
PEND
PRESET
(0 -
15)
(0 -
15)
(0 - 1)
(0
- 1)
Peripheral Data
Data
Input
Data
Output
Status
Input
Control
Output
Peripheral Flag
Peripheral Control
Peripheral End
Peripheral Reset
Asynchronous Serial
(U:P
27128A)
The 27128A is a single-channel, asynchronous serial
interface suitable for
interfacing to RS-232C peripherals
and
terminal emulation.
An
on-board microprocessor
and
buffering offer a wide range of protocol, timing
and
editing features to simplify application programming
and
reduce central processing overhead.
Features
• Switch selectable
and
sofhvare programmable
baud
rate;
up
to
19200
bits
per
second.
•
EIA
RS-232C, CCITT
V.24"
and
CCITT V.28
compatibility .
• Asynchronous transmission in simplex, full duplex
and
echoplex mode. Note:
modem
support
for full duplex
and
echoplex.
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