THE HP-IB
(cant)
HP-IB Specifications
Summary
lamber
at
Inten:OIInectad
Devices:
Up
to
15
maximum on one contiguous bus.
18tereoaHCtiOA
Pltb/MIXlIRlim
Cable
Length:
Star
or linear bus
network;
total
tranmission path length =2 metres
times
number
of
devices, or
20
metres, whichever is less.
Mnsate
TraDlfer
Scheme:
Byte-serial, 8 bit-parallel asynchronous data
transfer
using a 3
wire
handshake.
nita
Rate:
One
megabyte per second, maximum over limited distances, actual data rate
depends
upon
the
capability
of
the
slowest
device involved in
the
transmission.
(The
3314A's
maximum
data rate is approximately
3ms
per character
when
using
Data Transfer Mode 2.)
Addntll
Capability:
Primary addresses: 31 talk, 31 listen. Secondary addresses:
961
talk,
961
listen.
1 Talker and
14
listeners, maximum at one time. (The
3314A
does
not
have
secondary, extended address capability.)
Centrol
S~1ft
In systems
with
more
than
one controller, only one can be active at a
time
. The
active
controller can pass
control
to another controller,
but
only the system con-
troller
can assume unconditional control. Only one system controller is allowed.
The
system controller Is hard-wired
to
assume bus
control
after
a
power
failure
or
other
catastrophic calamity.
Interface
Cfn:ults:
Driver
and receiver
circuits
are TTL compatible.
82
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