C O M M A N D R E F E R E N C E
Command Reference
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LDC-3700 Series
59
C H A P T E R
4
Command Reference
The following pages contain a reference for the device−dependent commands of the LDC−3700B
Series Laser Diode Controller. This reference contains useful information for both local and remote
operation of the LDC−3700B.
In some references, parentheses are used to signify the labeled area for a particular switch or LED
indicator on the front panel. For example, (TEC DISPLAY) SET refers to the switch labeled "SET" in
the TEC DISPLAY area of the front panel.
Action
Adjusts the internal analog to digital (A/D) converter to reference points, then reports results.
Results
Zero = OK
Non−zero = calibration error
Note
A/D referencing is performed each 10 minutes of inactive time.
Example
*CAL?
Action
Clears status event registers: Event Status, Event Status Enable, and Error Queue.
Note
Useful to clear registers before enabling service requests (SRQ).
Example
*
CLS
Action
The DELAY command causes the execution of commands to be delayed by a user−defined time.
This command is similar to the *WAI common command, except that execution resumes after the
specified number of milliseconds, instead of waiting for the Operation−Complete flag to be set.
Parameters
An <nrf value> which represents the delay time, in milliseconds.
Notes:
The Operation−Complete flag is held false until the delay period elapses, but the *OPC? query will
not execute until the delay period has elapsed.
This command is useful for creating delays which don’t require a lot of program code and don’t tie
up the GPIB during execution.
The delay time is approximate, with an error of about 10%.
Care should be taken to set the GPIB time−out appropriately for use with the Delay command. After
this command (or the *WAI) command is sent, the 3700B Series Controller may receive up to 20
more commands before the delay period is over. If more than 20 commands are sent before the
delay or wait period is over, the additional commands will be ignored and an error E220 will be
generated.
Examples
"DELAY 500" −action: Further commands and queries are not executed until about 0.5 seconds
have elapsed from the time this command is executed.
"Tec:T 22;Delay 2000;Tec:T?" −actions: The TEC is set to 22.0
°
C, then the LDC−3700B Series
Laser Diode Controller waits for about 2.0 seconds before returning the measured temperature.
*CAL?
C
OMMON
D
EVICE
D
EPENDENT
F
RONT
P
ANEL
*CLS
C
OMMON
D
EVICE
D
EPENDENT
F
RONT
P
ANEL
DELAY <nrf value>
C
OMMON
D
EVICE
D
EPENDENT
F
RONT
P
ANEL
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