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Actually,
any message
of up to 12 characters may be displayed in this manner.
The command
"D2your
name"
tells the 3468A
to display the message
"your
name"
in its display; "D2"
is called the " COMMAND
CODE".
The 3468A cannot
display
lowercase
letters,
it displays
unusual
symbols
instead.
It can
display,
however, special characters such as $, %, &, #, etc. Try these characters in place
of "your name".
At the end of the previous chapter is a blue page that describes each of the pro-
gram commands
the 3468A
will respond to, and how they are used.
Each instrument that you connect
to the interface loop has a unique " address",
and the 3468A
is no different. The address provides a way for the controller to
send
or receive
data from
one
instrument
on the loop when
actually there are
several
instruments
connected
together.
In the previous
example,
where
you
displayed your name,
we used the statement
"OUTPUT
901".
The "901"
refers
to the controller interface select code (isc) which is 9 and the 3468A address
which is 01.
Remember
that the controller automatically reassigns addresses to each device in
the loop. Addresses are assigned sequentially to devices in the loop in the direc-
tion of information flow. The first device in the loop, after the controller, will have
an address
of ''1''. The second device will have an address of ''2'', and so on
around the loop. The 3468A
may be connected anywhere in the interface loop;
the loop consisting of up to 30 devices. All the examples in this chapter assume
that the 3468A will be the only instrument in the loop and therefore addressed at
901.
When the controller tells a particular instrument to talk, i.e., send data over the In-
terface Loop, we say that the instrument has been " Addressed to Talk". Likewise,
when
the controller tells an instrument
to listen, i.e., receive data or instructions
from
the Loop,
the instrument
is said to have been
" Addressed
to Listen".
The
3468A
is capable of both talking and listening or it may be set to Talk-only,
in
which
case it cannot
listen to instructions or data coming
over the Loop. There
can be only one instrument addressed to talk on the Loop at any one time.
64
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