Model 8642A/B
Installation
^®N
SHOULD
BE
GROUNDED
NEAR TERMINATION
OF OTHER WIRE
OF
TWISTED PAIR
SIGNAL GROUND
P/O TWISTED PAIR WITH
11
P/O TWISTED PAIR WITH
10
P/O TWISTED PAIR WITH
9
P/O TWISTED PAIR WITH
8
P/O TWISTED PAIR WITH
7
LP/O TWISTED PAIR WITH
6
REN
DIO
8
DIO
7
DIO
6
DIO
5
ISOMETRIC
THREAD
M3.5
X 0.6
SHIELD
■
ATN
SRQ
IFC
NDAC
NRFD
DAV
EOI
DIO
4
DIO
3
DIO
2
DIO
1
-CONNECT
TO
EARTH
GROUND
^\©/^
24
"
PIN
MICRO-RIBBON
^-^
(SERIES
57)
CONNECTOR
Logic Levels
The Hewlett-Packard Interface
Bus
logic levels
are TTL
compatible,
i.e., the
true
(1)
state
is 0.0 Vdc to +0.4
Vdc
and the
false
(0)
state
is 2.5 Vdc to +5 Vdc.
Programming
and
Output Data Format
Refer
to
Section
III,
"Operation".
Mating Connector
HP 1251-0293; Amphenol 57-30240.
Mating Cables Available
HP 10631A,
1
metre
(3.3 ft.), HP
10631B,
2
metres
(6.6 ft.)
HP 10631C,
4
metres
(13.2 ft.), HP
10631D,
0.5
metres
(1.6 ft.)
Cabling Restrictions
1.
A
Hewlett-Packard Interface
Bus
system
may
contain
no
more than
2
metres
(6.6 ft.) of
connecting cable
per instrument.
2.
The
maximum accumulative length
of
connecting cable
for any
Hewlett-Packard Interface
Bus
system
is
20 metres
(65.6 ft.).
Figure 2-2. Hewlett-Packard Interface Bus Connections ^TQT^
2-7
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