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User Manual 3155

Programming Reference 4-47

OUTPut:SYNC:POSition?

Response and default

The 3155 returns the present duty cycle value. Default value is 50.

Response to query version

The 3155 returns the present SYNC position value. Default value is 0.

OUTPut:SYNC:WIDTh<width>

Purpose

This command programs the width of the SYNC pulse. The sync width can be varied through a limited range

to allow widening of the sync pulse.

• <width> sets the SYNC width

Parameter type

Numeric (integer only)

Parameter range

<width> 4 to 100000 in units of waveform points.

OUTPut:SYNC:WIDTh?

Response and default

The 3155 returns the present SYNC width value. Default value is 4.

OUTPut:TTLTrig<N>{OFF|ON|0|1}

Purpose

The backplane on the PXI chassis has some signals on the P2 connector that allow inter-instrument commu-

nication 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 OUTP:TTLT<N> command connects a trigger pulse to one or more of the backplane trigger

lines. <N> can range from 0 through 7. The trigger pulse is an exact duplication of the SYNC output pulse.

Therefore, programming the width and location of the SYNC output, has the same affect on the TTLTrig

lines. The outp:ttlt command can be applied to 1 or more lines.

• <N> can be selected from 0 through 7

• ON or 1 converts the designated TTLT line to an output and places a SYNC pulse on this line

• OFF or 0 sets the designated TTLT line output off, removes the Sync pulse and places the line in a high-

impedance, tri-state mode.

Parameter type

Discrete

OUTPut:TTLTrig<N>?

Response and default

The 3155 returns the present designated TTLT line state: 1 if the SYNC output is on, or 0 if the SYNC output

is off. Default value is 0.

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