Chapter
4
COMMAND
REFERENCE
4.1
Introduction
This chapter is a gude to the
syntax
and usage of the various devicedependent commands for the LDC-3700
Series Laser Diode Controller. It contains a reference section for all of the devicedependent conunands, including
those which may only
be
accessed via remote operation. Therefore, it
is
of primary interest to
users
who wish to
utilize the
GPIB
option.
'hs chapter is divided into two
parts.
The
first
part
contains an ove~ew of the remote commands and
syntax
used
by
the LDC-3700 Series Laser Diode Controller.
If
you
are
not interested
in
remote operation,
skip
Sections
4.2
and 4.3.
The second part contains all of the LDC-3700 Series
Laser
Diode Controller commands
in
alphabetical order.
Figure 4.1 shows the format for the device command descriptions in
this
chapter. The commands which emulate
local (front panel) operation are denoted
by
the
solid
box
next to the
Local
label
in
the
upper
left corner of the
command description. The error messages which may
be
displayed on the LDC-3700
Series
Laser Diode
Controller front panel are listed in Appendix D.
A short BASIC program example for remote operation of the
LDC-3700 Series Laser Diode Controller
is
given
in
Section
4.6.
The common
GPIB
(ANSVEEE-488.2) commands which
are
supported
by
the LDC-3700 Series Laser Diode
Controller are described in Chapter 3.
4.2
Ovemew
of
the
LDC-3700
Series Laser Diode Controller Command
Set
There are two
types
of device commands, commands
-
which
cause
the LDC-3700 Series Laser Diode Controller to
do something, and queries
-
which return a stored value or state of the insuument. Queries
must
be
terminated
with
a question
mark
(?),
while commands may require
a
parameter(s) to follow.
For example, the
"1"
in the command "TEC:DIS l", enables the LDC-3700
Series
Laser Diode Controller TEC
display, while a "0" would disable (blank) the TEC display. Table
4.1
(Section 4.2.1) contains the allowed
substitute mnemonics for 1 and 0.
This command emulates the front panel operation of (1) selecting the TEC display section of the front panel, (2)
selecting the display section, and (3) turning it on.
Most of the commands whlch emulate the front panel operation are
just
as
intuitive
(see
Table 4.2).
In
Table 4.2
the required leners for each
command
are shown. Section 4.4 contains a detailed account of each command and
tells whlch are also supported
by
front panel operations.
In
Section 4.4, each command is spelled out with the
required
letters
in
upper
case
and the optional letters
in
lower
case.
The optional letters may
be
used
to improve
program readability.
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