Examples of the various <decimal numeric program
data> is given in the following.
NR1 elements consists of a set of implicit point
representations of numeric values. i.e. (+/-)12345.
NR2 elements are the representations of explicit
point numeric values. i.e. (+/-)12.345.
NR3 elements are representations of scaled explicit
radix point numeric values together with an exponent
notation. i.e. (+/-)123.456E(+/-)3.
The <suffix program data> element permits the
use of suffix following the NRf. The suffix expresses
associated units and (optional) multipliers that modify
how the NRf is interpreted by the device.
For an example, to program the model 8020 for
a frequency output of 10.7 MHz, the following <pro-
gram message unit> options may be used:
FRQ 10700000; or
FRQ 10.7MHZ; or
FRQ 10.7E+6; or
FRQ 10.7E6HZ; etc.
<Command program header> and <suffix program
data> and (optional) multipliers summary is given in
the following
FRQ ...HZ, KHZ, MHZ = Program frequency
parameter
AMP ...MV, V = Program amplitude parameter
OFS ...MV, V = Program offset parameter
WID ...NS, US, MS, S = Program pulse width
parameter (model 8021 only)
CAR ...% = Program modulated carrier level
parameter (model 8022 only)
STP ...HZ, KHZ, MHZ = Program logarithmic sweep
stop parameter
SWT ...NS, US, MS, S = Program sweep time
parameter
MRK ...HZ, KHZ, MHZ = Program logarithmic
sweep marker parameter
RPT ...NS, US, MS, S = Program internal trigger
generator period parameter
DCO ..MV, V = Program DC output level (models
8020 and 8022 only)
The programming limits for each of the above pa-
rameters are listed in Table 3-2. After DCL or SDC,
the instrument defaults to its factory selected values.
Factory defaults are listed in Table 3-1 and 4-4.
4-10-7. Common Commands
As discussed in previous paragraphs most instruments
and devices in an ATE system use similar commands
which perform identical functions to avoids the prob-
lem in which devices from various manufacturers
used a different set of commands to enable functions
and report status. Some common commands and
queries, however, are optional; most of them are
mandatory. Common commands and queries are
listed in Table 4-6. The following set of common
commands are utilized in the model 8020 (optional
common commands that are not included in the
model 8020 command set will not be discussed
here).
*CLS (Clear Status Command) - clears status
data structures, and forces the device to the Operation
Complete Command/Query Idle State. If the Clear
Status command immediately follows a <Program
Message Terminator>, the Output Queue and the
MAV bit will be cleared.
*ESE (Standard Event Status Enable Command)
- followed by a number in the range of 0 to 255,
sets the Standard Event Status Enable Register bits.
The binary equivalent of the number represents the
values of the individual bits set into the Standard
Event Status Enable register.
*OPC (Operation complete Command) - causes
the device to generate the operation complete mes-
sage in the Standard Event Status Register when
all pending selected device operations have been
finished.
*RCL (Recall Command) - restores the state of
the device to a state previously stored in the device’s
memory. If the device has more than one memory
register, the command must be followed by a number
to specify which register is to be used. The functions
restored by the *RCL command are the same as
those affected by the *RST command. Model 8020
may recall settings in registers designated with num-
bers from 00 to 30.
*RST (Reset) - Sets device-dependent functions
to a known state, purges all *OPC commands and
queries, and aborts all pending operations. The output
queue, Service Request Enable Register, Standard
Event Status Enable Register, and power-on flag
are not affected. Device defaults are listed in Table
4-4
*SAV (Save Command) - allows the user to store
the present state of a device in local memory. If
the device has more than memory location, the
command must be followed by a number to designate
the storage register to be used. Model 8020 may
Model 8020 IEEE-488.2 Operation
Page 4-17
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