Racal Instruments 3155 Spezifikationen PDF herunterladen (Seite 173)

User Manual 3155

Programming Reference 4-62

1) The 3155 must be set to operate in continuous mode

2) Select the MIX sequence advance mode

3) Assign the mixed mode bits for each sequence step in your SEQ:DEF command. “0” programs normal

advance, “1” programs trigger advance. A step with a “0” bit assigned to it advances automatically to the

next step. If a “1” is assigned to a step, the instrument will generate this step and its associated number

of repeats continuously, and only a valid trigger signal will advance this step to the next step.

SEQuence:ADVance?

Response and default

The 3155 returns the AUTO, STEP, SING, or MIX depending on the present sequence advance mode set-

ting. Default value is AUTO

SEQuence:ADVance:SOURce{EXTernal|INTernal|TTLTrig<N>|STAR}

Purpose

This command selects the sequence advance source. The source of the event causing sequence advance

can be specified by the user. The backplane on the PXI chassis has some signals on the P2 connector that

allow inter-instrument communication and synchronization. Among these lines, there are some trigger lines,

STAR trigger, and local bus lines. There are 8 trigger lines that can serve as source or target. Normally,

these lines are designated as tri-state lines. The TRIG:SOUR:TTLT<N> command converts one of these

lines to input. <N> can range from 0 through 7. But only one line can be selected as an advance source.

• <EXTernal> selects external advance mode

• <INTernal> selects internal advance mode

• <N> is selected from 0 through 7

• <STAR> selects the STAR trigger module. Select this option only if you use a STAR compatible control-

ler.

SEQuence:ADVance:SOURce?

Response and default

The 3155 returns EXT, INT, TTLT<N>, or STAR depending on the present trigger advance source setting.

Default value is EXT.

SEQuence:DEFine <step_#>,<segment_#>,<#_repeat>,<mode>

Purpose

This command defines sequence steps and their associated advance modes.

• <step_#> defines the link number

• <segment_#> selects the segment for the above link

• <#_repeat> defines how many times the selected segment will loop

• <mode> assigns the mixed mode bit for this sequence step. “0” programs normal advance, “1” programs

triggered advance. A step with a “0” bit assigned to it advances automatically to the next step. If a “1” is

assigned to a step, the instrument will generate this step and its associated number of repeats continu-

ously and only a valid trigger signal will advance this step to the next step. Note that the <mode> pa-

rameter has no affect when the sequence advance mode is set to SING.

To understand the way the <mode> switch affects a sequence, consider the following sequence setting:

SEQ:DEF 1,1,1,0 (Step 1 = segment 1, no loops, mode 0)

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Racal Instruments 3155 Spezifikationen Seite 173