REMOTE OPERATION
Command Syntax
40 LDC-3700 Series
CHAPTER 3
REMOTE indicator will flash at a 1 Hz rate to indicate that the front panel is completely disabled by
Local Lockout. The TALK/LISTEN indicator illuminates when the instrument is communicating over
the GPIB bus.
Command Syntax
This section describes command syntax and structure. You need this information to effectively write
GPIB control programs. The syntax of GPIB commands follow the rules defined in the ANSI/IEEE
488.2−1987 standard.
Letters
Any GPIB command or query must contain all of the letters which are shown in upper case in the
command definition. Some of the device dependent commands include additional optional letters
shown in lower case in the command reference (Chapter 4, Command Reference). Upper/lower
case does not matter, it is used in this manual to identify optional letters. The optional letters must
be in the correct sequence. Some examples of what works, and what does not:
White Space
"White space" is normally the space character (space bar). A single white space must separate a
command from its parameters or data. For example:
To enhance readability you can also use one or more white spaces before a comma, semicolon, or
terminator. Since your computer normally puts the terminator at the end of each command string
(line), this simply means that an extra space character at the end of your command line works OK.
A query has no space between the mnemonic and the question mark. For example:
Note that too many consecutive white spaces can overflow the 256−byte data I/O buffer.
Okay Not Okay
DIS DS
Disp dsp
Displ dply
Displa DSPLY
Display disply
Okay Not Okay
DELAY 500 DELAY500
Okay Not Okay
TIMER? TIMER ?
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