• Programmable format control
and
built-in framing
error,
overrun
error
and
parity checking.
• Break detection,
support
for X-ON/X-OFF
and
terminal
emulation
mode.
Operation
The serial interface permits
the
following
baud
rates to
be
configured
by
program
control
or
by
a switch
that
selects
the
rate to
be
configured
at
power-up:
50,
75,
110,
134.5, 150, 300, 600, 900, 1200, 1800, 2400, 3600, 4800,
7200, 9600, 19200.
Note:
Not
all
data
recognition
features
are
supported
for
continuous
data
transfer
at
19200
baud.
The following formats
and
protocols are also
programmable:
• Parity:
none,
odd,
even,
"0"
or
"1".
•
Number
of bits
per
character:
5,
6,
7,
or
8 plus parity.
•
Number
of stop bits:
1,
1.5"
or
2.
• Handshaking: ENQ/ ACK
and
X-ON/X-OFF
The on-board microprocessor
and
buffering of
the
27128A offer efficient, high-performance terminal
handling. The 27128A card
has
enough
buffer space to
store
up
to 485 characters
on
input
and
500
on
output.
The on-board processor allows
the
user
to edit
the
buffer
with
delete character
and
delete line commands. These
features significantly reduce
the
time
spent
by
the
CPU to
handle
data
entry
from terminals.
In addition,
the
27128A offers
numerous
features for
satisfying
more
specialized data communication
and
serial interfacing requirements. The features listed below
are currently accessible to
user
programs
through
the
Series
500
BASIC Language System only.
Many
of these
features are also accessible
through
HP-UX's
Asynchronous Communication software
and
BASIC's
Asynchronous Terminal Emulator. These
two
packages
are designed to
help
develop readily configured,
asynchronous
data
communication solutions.
The 27128A offers four alternatives for signaling the
Series
500
when
an
incoming record is complete
and
ready for processing.
• User-specifed single text terminators. The
user
can
specify
up
to eight characters
and,
with
the
quoting
mode, specify a terminator which
should
be
inserted
in
the text buffer
without
terminating
the
record.
• A user-specifed double text terminator.
• Activation of
an
interrupt
mode
which
will signal
the
Series 500
when
new
data is available.
• Expiration of a character counter.
Additional character recognition capabilities allow
the
following features:
• automatic
and
conditional
appendage
of separators
on
transmitted text,
• programmable
prompt
sequence detection
and
• signal character checking.
The 27128A can ease real-time
programming
requirements
with
the following:
• break detection
and
generation,
• a no-activity
and
lost receiver disconnect timer,
and
a
host
ENQ/ACK
timer.
7
Asynchronous 8-Channel Multiplex
(UP
27130A)
The 27130A Asynchronous Multiplexer is
an
economical solution for interfacing
up
to
eight
RS-232C
or
RS-423A compatible devices to
the
Series 500
with
a
single
hardware
interface. The 27130A can easily
be
configured to
support
a
wide
range
of terminals, printers
and
other
asynchronous devices.
Features
•
ccm
V.I0/28, EIA RS-232C compatible.
•
Supports
simplex, echoplex
or
full-duplex
mode
(asynchronous transmission only).
• Selection of data transmission attributes
can
be
performed
independently
on
each channel.
• Local intelligence reduces time
consumed
by
the
CPU
during
I/O transactions
by
offering
edit
functions,
special character recognition
and
handshake
protocol
control.
• Parity,
overrun
and
framing errors are
sensed
locally to
detect transmission errors.
• X-ONIX-OFF (both directions)
and
ENQ/ACK
(one
direction,
host
sending
ENQ)
handshaking.
Operation
Programmable attributes:
Baud rates
................
110, 134.5, 150, 300, 600,
1200, 2400, 4800, 9600
or
19200
Parity
. . . . . . . . . . . . . . . . . . . .
Odd,
even
or
none
Stop bits. . . . . . . . . . . . . . . . . . 1
or
2
Character size
.............
5, 6, 7
or
8 bits
Handshakes
..............
ENQI
ACK
and
X-ON/X-OFF
Note:
Not
all
data
recognition
features
are
supported
for
continuous
data
transfer
at
19200
baud.
The 27130A
uses
microprogrammed capabilities to
offer efficient,
high
performance device handling. The
interface buffers
each
channel
with
two
512 byte
memories for transmission
and
receiving. The intelligence
of
the
interface permits
users
to edit these memories
and
use
character recognition to insert
or
strip characters,
which
results in a streamlined peripheral interface.
110
Expander
(UP
97098A)
The
HP
97098A I/O Expander is
an
external card cage
supported
by
the
Series 500.
It
provides
user
access to
the
second
and
third
I/O Processors for additional I/O
interface card capacity. With
the
97098A,
you
can
access
an
additional eight channels
with
Direct
Memory
Access
capability
on
each
channel. Thus,
two
97098A I/O
Expanders will increase
the
capacity to
20
user-available
I/O slots
on
the
Model 520,
and
23
on
the
Models 530
and
540,
and
15
on
Model 550 (with
one
additional 97098A).
Specifications
No. of
I/O slots
.............
8
Line requirements
..........
90
- 132 Vac, 2.5 A max.
or
198 - 250 Vac, 2.5 A max.
Max.
power
dissipation . . . . . 180
watts
Input
frequency. . . . . . . .
..
..
47 - 66
Hz
Dimensions:
Height
...................
7.4 in. (18.7 cm)
Width
....................
16.75 in. (42.5 cm)
Length
...................
19.85 in. (50.4 cm)
Cable length
..............
6
ft.
(1.82m)
Note:
There
must
be
an
additional
I/OP
for
each
Expander.
Limit
= 2
I/OPs.
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