ferences can
still
occur
within
the
limits
of
the
specifications
.
Where
compatability
is
in
doubt. contact
our
local representative
for
details.
3.5.1.
lEe
Functions
Implemented
The interface
of
the Type
1617
implements the
following
functions.
as specified by
the
IEC
proposal . The clauses referred to are the
relevant
clauses
in
the
IEC
proposal
in
which
the
functions
are specified. The equivalent
section
in
the
IEEE
/ ANSI standard are
given in parentheses.
Clause 7.
Clause
9.
Clause
11.
Clause
12.
Acceptor Handshake Interface (AH)
Function.
(Section
2.4)
AH 1 - complete capability
Listener Interface
(L)
Function. (Section 2 .6)
L2
Remote
Local
(RL)
Interface Function. (Section 2 .8)
RL2
Parallel Poll
(PP)
Interface Function. (Section 2 .9)
PP2
All
other
functions
: no capability.
Busy is indicated by the NRFD hold (Not Ready
for
Data hold)
method
.
3.5.2.
Selection
of
Listener
Address
The five-pole LISTEN ADDRESS
switch
on the rear panel is used
to
set
the
Listen
Add-
ress. Listen Address is set
in
ISO
7-bit
code.
where
bit
7 and
bit
6 are
always
"
1"
and
"a" respectively. The
switch
marked 5 is bit 5.
switch
4 is
bit
4.
and so
on
.
Any
possi-
ble code. except
11111
is permitted. Code
11111
corresponds to
unl
isten. In
the
follow-
ing examples.
the
address code
00011
corresponding
to
device
number
3
will
be used.
3.
5.3.
Programming
Sequence
Programming
of
the
front
panel
functions
is
performed
in a fixed sequence
with
1 to 5
steps.
or
data bytes. Programming data is received as ISO
7-bit
codes
(i
.e. ASCII.
but
without
parity
bit).
Step 1
Step 2
Step 3
Step 4
Step 5
sets most
significant
digit
of
the band
number.
or
shifts
to
the
next
higher
band
number
. (See Table 3 .2
for
band
numbers
.)
sets
least si
gnificant
digit
of
the band
number
.
sets
Bandwidth
of
filters
and Range (Table 3 .3).
sets
Averaging
Control program (Table
3.3)
.
sets
Start
Record and Recording Step Size
A
programming
sequence is terminated by sending EOI (End
Or
Identity)
together
with
the
last step (data byte).
If an 8 is received in Step
1.
thE:
Type
1617
shifts
to
the
next
higher
band
number.
in
which
case Steps 2
to
5
must
be
omitted
.
31
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