Datron 4708 User Handbook Manual page 15

Pin Designations
J27
Pin
No
Name
Description
1
DlOl
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 Accepted
9
IFC
Interface
Clear
10
SRQ
Service Request
11
ATN
Attention
12
SHIELD
Screening
on
cable (connected
to
4708
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
DIOS
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 twistedpair
withNDAC
21
GND9
Gnd
wire of
twisted pair
with
IFC
22
GND
10
Gnd
wire of
twisted pair
with
SRQ
23
GNDll
Gnd
wire of
twisted pair with
ATN
24
GND
4708 Logic Ground
(Internally
con-
nected
to
4708
Safety Ground)
External
Reset Socket
&
4600
Digital
Connector J54
Pin Layout
#0000
000000#
15
9
Pin Designation
Pin
Name
Function
1
SHIELD
Case
Ground
0V_6
Digital
Common
IWR_R
Write
Strobe (Rising
Edge)
0V_6
Digital
Common
0V_6
Digital
Common
ICAL_RST_L
Not used on
4600
IA_H_D_
L
Address/Data on
AD0-AD4
8
IRD_L Read
Strobe (Active
Low)
IDIGBUSON.H
-I-5V
(5k)
when
4708
is
on.
0V_6
Digital
Common
lADO
Bi-directional
Address/Data
lADl
Lines, controlled
by
IAD2
Strobes
and
14
15
IAD3
IAD4
_
IA_H_D_L
Rear Output Terminals
(Option
42)
The
4708
is fitted
with
either six front panel output terminals or
six rear output terminals.
The
Rear Output
alternative
is
fitted
at
the customer's request only
at
manufacture.
The 4708
cannot be
fitted
with both
front
and
rear output
terminals.
The
functions
of
the
six
terminals are
identical to
those normally
fitted
on
the front panel,
and
the external leads are connected
in
the
same way.
(See Section
4
for
details).
External Reference
Frequency
Input
Socket
J53.
This
BNC
socket
is
located next
to
the cooling
air
intake
filter.
It
enables
the
frequency
synthesizer
to
be
locked
to
a customer's
own
frequency
standard
provided
that
it
meets
the
following
criteria:
Voltage:
500m
V
to
15V
peak-to-peak
Frequency:
IMHz
± 1%
or
lOMHz
±1%
N.B. The
socket has an
input resistance of
approximately
50Q
External Reset Switch Wiring
This D-type socket
located next
to
the optional rear output
connectors
may
be used
to
input
an
external
reset to restore the
4708
to
its
power-up
state
(DCV, IV
Range)
.
Socket J54
4600 Analog Connect or J56
Pin
Layout
and
Designations
2-3