Triggered Sweeps; Reading And Masking The Status Byte; Reading A N D Masking The Status Byte - HP 3326A Operating And Reference Manual

Triggered Sweeps
SER?
The SER? (SERial number) command transmits a ten character string stored in the
HP 3326A read only memory. The ten character string has the form of nnnnAOOOO where
nnnn represents an integer corresponding to the revision date for the HP 3326A soft-
ware. The year is represented by the first two digits, and the week is represented by
the second two digits. The next character in the string is the ASCII character A, and
the remaining characters are zeros. The actual serial number of the HP 3326A is not
stored in memory.
TRIGGERED SWEEPS
The sweep functions of the HP 3326A operate under trigger control when the STC (Sweep
Triggered Continuous) or STS (Sweep Triggered Single) HP-IB commands are in effect.
The HP 3326A responds to either a trigger applied through the rear panel EXT TRIG
(EXTernal TRIGger) connector or to the HP-IB group execute trigger command. Refer
to the controller operating manual for implementation of the group execute trigger
command.
STC
The STC (Sweep Triggered Continuous) command enables the HP 3326A to initiate a
continuous sweep when a trigger is received. A sweep in progress is stopped after the
STC command is issued. The shortest delay (I 10 I S ) between a trigger and sweep
start occurs when the trigger is preceded by the SRE (Sweep REset) command.
STS
The STS (Sweep Triggered Single) command enables the HP 3326A to initiate a single
sweep when a trigger is received. A sweep in progress is stopped after the STS com-
mand is issued. The shortest delay
( 5
10 I S ) between a trigger and sweep start occurs
when a trigger is preceded by the SRE (Sweep REset) command.
TOFF
The TOFF (Trigger OFF) command disables trigger operations on the HP 3326A. Trig-
ger operations are enabled when power is applied, after an instrument preset, or with
the TDN, TUP, STC, and STS HP-IB commands.
READING AND MASKING THE STATUS BYTE
The MASK command specifies which bits in the status byte are enabled to generate
an SRQ. The status byte is an eight bit word that the HP 3326A outputs when requested
by a serial poll. The state of each bit indicates the status of an internal HP 3326A func-
tion. A service request is generated when the Boolean AND of the status byte and sta-
tus byte mask is not equal to zero.