The SW-10A switch position
is
represented by the characters 1-9,
and
A.
The 1-9 stands for positions
1
thru 9, the
A
stands for position 10.
The switch position information
is
only present for the
B
display sensor.
When the
A
position
is
selected
as
display sensor, the position
is
returned
as
zero. (When there
is
no position present for the
B
display sensor, the
switch position
is
returned
as
zero.
An
example of the panel information
for
a
DRC
instrument that
is
in remote (accepts
set
point commands from the
IEEE),
is
in the expanded
scale
mode, has
B
as
display sensor,
A
as
control
sensor, and has an SW-10A position of
2,
would look like 1C2.
When the instrument
is
in display
A
mode, the external switch
position
is
ignored and the switch position character
is
set
to zero.
An example of
a
transmission for an instrument which has: switch
1
of the
IEEE
address switch up
at
power on,
a
gain setting of
5,
a
reset
setting of
C,
scale
expand button in,
A
as
display sensor,
B
as
control
sensor, no SW-10A input,
set
point of 130.0 K, and
a
display of 24.06 K,
is
in remote control (IEEE), and has Si
as
type would
look
like this:
5
(LF) (CR)C (LF) (CR)1A0(LF) (CR)130.0 (LF) (CR)0024.06 (LF) (CR)
EOI
SET
ON
FINAL (CR)
When there
is
a
display error message, this message
is
transmitted
over the bus in the temperature variable. The following table gives the
display error and the corresponding error code output from the
IEEE:
Display Sensor Interface Equivalent
LO
1
E100.00
HI
1
E200.00
HI
2
E300.00
LO
2
E400.00
When addressed
as
a
LISTENER, the interface must receive
a
code
(function) and code settings to
set
parameters. The codes and commands
along with formats
are:
CODE
FUNCTION FORMAT FOR
DATA
FORMAT
LIMITS
(X)
A
Set
Point Variable forms of
XXX.X
only numerics accepted
B
Gain
X
0-9,
A-F
C
Reset
X
0-9,
A-G
D
Flag Toggle
The
A
command allows for considerable flexibility. If the
A
com-
mand
is
received, but not followed by any numerics, the
set
point
is
set
to
zero. The internal program
is
structured
so
that the
last
three numerics
before the decimal point
are
accepted and the first numeric after the decimal
point.
All
other
ASCII
characters
are
ignored except for
B,
C,
and
D.
The
following examples should illustrate the flexibility of the input. (This
format makes the allowance for the implied sign before any numeric variable
output in basic programming.)
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