HP 9030 Service Manual page 110

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.