Remote Operation
Use Commands 5
5-33
Commands for IEEE-488 Only
The IEEE-488 checkbox shows commands that are used for the IEEE-488 interface. This
is all the commands but those used for RS-232 operations. (See “Commands for RS-232
Only.”) All commands are transferred over the IEEE-488 as data, except for the
commands LOCAL, REMOTE, and LOCKOUT, which are implemented per IEEE
Standards as messages (see Table 5-7).
Table 5-7. Commands for IEEE-488 Only
IEEE-488 Message
[1]
Command Representation
GTL LOCAL command
GTR REMOTE command
LLO LOCKOUT command
SRQ SRQSTR command
SDC, DCL Clear the device
GET Execute a group trigger
SPE, SPD Print the serial poll string
[1] See “How IEEE-488 Operates” in this chapter.
Command Syntax
The subsequent syntax rules apply to all the remote commands. Information about syntax
of response messages is also given.
Parameter Syntax Rules
Table 5-8 shows the units accepted in command parameters and used in responses. All
commands and units can be recorded in UPPER or lower case.
Table 5-8. Units Accepted in Parameters and Used in Responses
Units Meaning
HZ Frequency in units of hertz
KHZ Frequency in units of kilohertz
MHZ Frequency in units of megahertz
UV Volts in units of microvolts
MV Volts in units of millivolts
V Volts in units of volts
KV Volts in units of kilovolts
UA Current in units of microamperes
MA Current in units of milliamps
A Current in units of amps
PCT Percent
PPM Parts-per-million
DBM Volts in units of decibels referenced to 1 milliwatt into 600 Ω load
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