Specifications

Setting Output
Functions
Both the VT1533A Digital I/O SCP and VT1534A Frequency/Totalizer SCP can
output static digital states. The VT1534A Frequency/Totalizer SCP can also output
single pulses per trigger, continuous pluses that are width modulated (PWM and
continuous pulses that are frequency modulated (FM).
Static State (CONDition) Function
To configure digital channels to output static states, use the
SOURce:FUNCtion:CONDition (@<ch_list>) command. Examples:
To set the upper 8 bit channel of a VT1533A in SCP position 7 to output
SOUR:FUNC:COND (@157)
To set the lower 4 channels (bits) of a VT1534A in SCP pos 6 to output states
SOUR:FUNC:COND (@156:159)
Variable Width Pulse Per Trigger
This function sets up one or more VT1534A channels to output a single pulse per
trigger (per algorithm execution). The width of the pulse from these channels is
controlled by Algorithm Language statements. Use the command
SOURce:FUNCtion[:SHAPe]:PULSe (@<ch_list>). Example command sequence:
To set VT1534A channel 2 at SCP position 6 to output a pulse per trigger
SOUR:FUNC:PULSE (@149)
Example algorithm statement to control pulse width to 1 ms
O149 = 0.001
Variable Width Pulses at Fixed Frequency (PWM)
This function sets up one or more VT1534A channels to output a train of pulses. A
companion command sets the period for the complete pulse (rising edge to rising
edge). This of course fixes the frequency of the pulse train. The width of the pulses
from these channels is controlled by Algorithm Language statements.
Use the command SOURce:FUNCtion[:SHAPe]:PULSe (@<ch_list>). Example
command sequence:
To enable pulse width modulation for VT1534A’s third channel at SCP
position 6
SOUR:PULM:STATE ON,(@150)
To set pulse period to 0.5 ms (which sets the signal frequency 2 kHz)
SOUR:PULSE:PERIOD 0.5e-3,(@150)
To set function of VT1534A’s third channel in SCP position 6 to PULSE
SOUR:FUNCTION:PULSE (@150)
Example algorithm statement to control pulse width to 0.1 ms (20% duty-cycle)
O150 = 0.1e-3;
Programming the VT1419A Multifunction
Plus
Setting Up Digital Input and Output Channels
Chapter 3 69
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