Solartron 1287 - GPIB Switches; Input Terminator; Talk Only

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3.3 GPIB SWITCHES
Some interface functions
are set
by
miniature
toggle switches
on the rear panel of
the instrument. These
functions
are described in the following
sections.
Once the GPIB
switches have
been set the instrument must
read them,
so
that
their
settings can be
implemented.
The switches are read automatically
at
power-on,
or when
an INITIALIZE
or RESET instruction
is given. The GPIB
switch
functions are
as follows
:
f
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Fig 4.4
GPIB switches
(all switches shown
in off position)
3.3.1 Device
Address
The ADDRESS
switches select the
GPIB address for the
SI 1287. To avoid
problems
associated with mixing
binary and ASCII information,
two
GPIB ports
are provided. The two
ports are serviced
through the same
GPIB connector,
but
each has
its own software
address.
The address
for the ASCII
input/output port
is
the
Major address.
This address
should always be an even
number,
so the left-hand switch
" 1
" should always be
in
the
’off position. If
an odd address
is
selected
on the switches,
the SI1287
responds to the preceding
even
address. This address +1
is
the
Minor address and
is assigned automatically,
for
high speed binary
dump outputs.
3.3.2
Input Terminator
Switches
FI and F2
select
the terminating character for
the GPIB input
commands
to the SI1287
as follows :
Switch FI
Switch F2
Terminator Selected
0
0 LF
(Line Feed).
1
0
CR
(Carriage return).
0
1
;
(Semicolon).
1
1
EOI (End or Identify).
The choice of
command terminator
is usually determined
by the type of
controller
used
and should be defined
in the relevant
controller handbook. Any
command
terminator other
than the one selected
is ignored by the
interface. The
output
terminator is
set by the command
OT/ see section 6.19.
3.3.3
Talk Only
Switch
The Talk only
mode can be
selected for the GPIB interface
by switching
the Talk
Only
switch to the ’on’
position. When switched
on the instrument
can act as
a
talker only, to drive
a listen-only device,
such as a plotter,
without the aid of
a
GPIB controller.
When switched
off the instrument
can act as a listener
or as a
talker, as commanded
by the GPIB controller.
4.6 CSB/SI1287 User Guide/Issue A
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