VXI VT1536A user manual Configuring Input Channel Polarity

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•INP:THR:LEV? returns a numeric value which is one of 5, 12, 24, 48 or 0 (zero) where zero means that the channel is configured as an output and non-zero values indicate the input threshold in volts.

Note If an invalid switch combination is set, INP:THR:LEV? will NOT return a value and will generate the error 3105 "Invalid SCP switch setting". This error will also be generated when *RST is executed. Channels associated with this error will behave as input channels with unknown threshold levels.

To query the threshold level on the second channel at SCP position 2 send:

INP:THR:LEV? (@117)

query 2nd chan on SCP pos. 2

enter statement here

returns 0 5 12 24 48

Configuring Input Channel Polarity

To configure input channel polarity use the command:

INPut:POLarity INVerted NORMal,(@<ch_list>)

To configure the first 2 channels on an VT1536A in SCP position 4 to input Normal polarity (opto on=logical 1) and its next 2 channels to input inverted polarity (opto off=logical 1)send:

INP:POL

NORM,(@132,133)

NORM is *RST default

INP:POL

INV,(@134,135)

 

There is also the query form; INPut:POLarity? (@<channel>), where

<channel> must specify a single channel. INP:POL? returns NORM INV.

Note The INPut:POL command will generate the error 3107, "Channel data direction conflicts with command" if any channel in <ch_list> is configured as an output.

Setting Debounce Time For a description of the debounce function See “Debounce Function” on page 8. The VT1536A has two debounce timers. One for the lower four channels, and one for the upper four channels. To set the debounce timers use the command:

INPut:DEBounce:TIME <time>,(@<ch_list>)

•<time> can be one of 16 possible numeric values or MIN and MAX:

Note Because the clock that generates the debounce period is asynchronous to your input signal, there is a region of uncertainty relative to the nominal debounce period selected. This is reflected in the “Minimum” and “Maximum” debounce period columns in Table 2.

VT1536A Isolated Digital Input/Output SCP 11

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Contents User’s and Scpi Programming Manual Page About this Manual IntroductionIdentifying the Plug-on Setting Configuration SwitchesInstallation Connecting To The Terminal Module VT1415A/19A/22A Terminal Module Connections Recommended Signal ConnectionsRecommended Connections and Voltage Limits Input and Output CharacteristicsVT1536A Input and Output Sections Example Using Debounce Feature Checking the ID of the SCP Programming With Scpi CommandsConfiguring Input Channel Polarity 12 VT1536A Isolated Digital Input/Output SCP Configuring Output Channel Polarity RST and *TST? Important Programming with the VT1415A/19A Algorithm LanguageOutput Characteristics Specifications16 VT1536A Isolated Digital Input/Output SCP

VT1536A specifications

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