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Bus
Addresses
When
an
IEEE
488
system comprises
several instruments,
a
unique
'Address' should
be
assigned
to
each
to
enable
the
controller to
communicate
with
them
individually.
One
address
is
sufficient for
a
Datron
instrument, as the control-
ler
can
add
information
to
it
to
define
either
'talk'
or
'listen'.
Interconnections
instruments
fitted
with an
IEEE
488
interface
normally
commu-
nicate
through a
set
of
interconnecting
cables, specified in the
IEEE
488-1978
Standard
document.
The 4708
interface
connector, J27,
is fitted
on
its
rear panel.
It
receives the specified connector,
whose
pin designations are
also standardised
and
shown
in Fig. 5.1
and Table
5.2.
Fig. 5.1
J27
Pin
Layout
12
1
J27
Pin No.
Name
Description
1
DIOl
Data
Input
Output Line
1
2
DIO
2
Data
Input
Output Line
2
3
DIO
3
Data
Input
Output Line
3
4
DIO
4
Data
Input
Output Line 4
5
EOI
End
or
Identify
6
DAV
Data
Valid
7
NRFD
Not
ready
for
Data
8
NDAC
Not
Data Accqpted
9
IFC
Interface
Clear
10
SRQ
Service
Request
11
ATN
Attention
12
SHIELD
Screening
on
cable (connected
to
Safety
Ground)
13
DIO
5
Data
Input
Output Line 5
14
DIO
6
Data
Input
Output Line
6
15
DIO
7
Data
Input
Output Line 7
16
DIO
8
Data
Input
Output Line
8
17
REN
Remote
Enable
18
GND6
Gnd
wire of
twisted pair
with
DAV
19
GND7
Gnd
wire of
twisted
pair
with
NRFD
20
GND8
Gnd
wire of
twisted pair
with
NDAC
21
GND9
Gnd
wire of
twisted pair
with
IFC
22
GNDIO
Gnd
wire of
twisted pair
with
SRQ
23
GND
11
Gnd
wire of
twisted pair
with
ATN
24
GND
4708
Logic
Ground
(Internally
connected
to
4708
Safety
Ground)
Table 5.2
IEEE
488-1978 Connector
-
Pin Designations
Fig
5.2.
Typical
System
Data
Input
-
Output
DI01^
DIO
2
DIO
3
DIO 4
I
DIOS
DIO
6
DIO 7
DIO
8
y
End
Of
Identity
Interface
Clear
Service
Request
Attention
Remote
Enable
Data
Valid
Not
Ready
for
Data
Not Data
Accepted
EOl
IFC
SRQ
ATN
5
I
Interface
r
Management
Lines
REN
J
DAV
NRFD
NDAC
^
3 Transfer
.
Control Lines
(hlandshake)
5-2
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