INPUT SET POINT
A
000.0
A9 009.0
A8009.6 009.6
Al30
130.0
A1Z2EF3Y.9Z 123.9
A1239 239.0
A50.5
050.5
The
B
and
C
commands each require
1
character following the
The gain and
reset
values can be seen in Section 3.8.
The
D
code command
is
used
to change from front panel controls
command.
to
IEEE
control or vice
versa.
The
D
code
acts
as
a
flag toggle, in that,
if the unit
is
under front panel control and the
D
command
is
sent to the
DRC
instrument, then
it
will
respond to changes only from the interface.
If the
D
command
is
sent again, the instrument returns to front panel
control. Therefore, on odd
times
for the
D
command being sent the unit
is
in remote control, and on even
times
the unit
is
in front panel control.
As
an example,
a
controller sends the ASCII sequence,
A130.0B9C5D
A
is
the
set
point code
130.0
five characters to represent the
set
point (130.0 K)
B
is
the gain code
9
is
the setting for resistors
(1001)
C
is
the
reset
code
5
is
the setting for resistors
(0101)
D
is
the flag to convert controller operation
(if no other
D
has been sent through, this one
switches control from front panel to
IEEE).
The interface
looks
for one of two input terminators.
The
DRC8-IEEE
will
return to normal operation when the
EOI
command
is
accepted on input.
The
DRC8-IEEE
will
also
look
for an input delimiter depending on the position
of switch
1
of
the address switch. The following table shows the input
delimiter selection.
Switch
1
Position Input
Delimiter
UP (OFF) (CR)
DOWN
(ON) (LF)
The
DC
(Device
Clear)
command on the
IEEE
bus
will
clear
the flag
and return control of
the
set
point to the front panel.
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