ILX Lightwave LDC-3700 Series User Manual

3.5 Advanced Programming
Once you have become familiar with the command syntax and structure, you may take advantage of some
programng shortcuts which are available.
Due to the "tree-walking" capabilities of the LDC-3700 Series Laser
Diode Controller software, the user
may elect to write command strings without constantly repeating the entire
command
path for each command.
3.5.1 Path Specification
The first command in the string must have its entire path entered. But once a path he1 is reached, other
commands which
are at the same level (or higher level) may then be entered without repeating the path. To
accomplish this, the semicolon
(;) must be used to separate the commands in the string, as usual. However, the
command following the semicolon need not
specrfy its full path, if the same path which was previously written out
could
be used for the new command.
For example, the following legal command string could
be used to (1) set the LDC-3700 Series Laser Diode
Controller TEC display to the measured temperature and
(2) set the TEC @lay for the (temperature) set point
value:
"TEC:DIS:T; SET"
The
path "TEC:DIS:" is "remembered" by the LDC-3700 Series Laser Diode Conuoller software in this case. If the
"SET" command were not found at this level, the software would walk back to the "TEC:" level and search for a
"TEC:SETW command.
If it is not found there, it will search at the next higher level, and so on until it finds the
command or not.
If the command is not found, an error message will be generated.
The foliowing is an example of command "tree-walking", where
(1) the LASER display is set for the current set
point, and
(2) the LASER output is turned on:
"Laser:&splay:set; out on"
The command "out" is
first searched at the "LAS:DIS:" level. Since the command "LAS:DIS:OUTU does not exist,
the
next higher level "LAS:" is searched. There the command "LAS:OUTW is found, and the parameter "on" is
legal,
so there is no error.
Care
must be taken to avoid errors which are caused by trying to implement commands from the wrong path or
level. For example, the following command string
was intended to (1) read back the set point resistance and (2)
read back the measured resistance:
"TEC:
SET:R'?; R7"
Instead, the output would return the set point resistance twice. When the second "R?" is found, the software will
first search for that command at its current level. Since it finds it there it will be executed. If this command did not
exist at
this level, the software would search down to the "TEC:" level and find and execute the intended
command, "TEC:R?".
In order to ensure the proper command is executed for the example above, the following command string should
have
been issued:
"TEC:
SET:R?; TEC:R?"
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ILX Lightwave LDC-3700 Series Specifications

General

Brand	ILX Lightwave
Model	LDC-3700 Series
Category	Controller
Language	English