[SENSe:]DIGital:MEMory:STEP

34980A

[SENSe:]DIGital:MEMory:STEP

Syntax

[SENSe:]DIGital:MEMory:STEP (@<ch_list>)

Description

This command reads one sample into buffered memory on the 34950A Digital I/O Module. If memory is currently disabled (see [SENSe:]DIGital:MEMory:ENABle command), this command will enable memory and step once (one sample is stored in memory). The width of the first channel in each bank (i.e., channels 101 and 201) controls the width of the memory operations (64K x 8 Bits, 64K x 16 Bits, or 32K x 32 Bits). The first channel on the specified bank must be configured as an input prior to starting a buffered read (see CONFigure:DIGital command).

Used With:

  • 34950A Digital I/O Module

Parameters

Name

Type

Range of Values

Default Value

<ch_list>

Numeric

The first channel on a bank in the form (@sccc).
Select from s101 or s201.

This is a required parameter

Remarks

  • Depending on the width specified (see CONFigure:DIGital:WIDTh command), the channel numbering is modified as shown below. For example, if you specify the width as a 16-bit WORD, channels 101 and 102 are combined and addressed collectively as channel 101.  

 

Bank 2

Bank 1

BYTE (8 Bits):

Ch 204

Ch 203

Ch 202

Ch 201

Ch 104

Ch 103

Ch 102

Ch 101

WORD (16 Bits):

Ch 203

Ch 201

Ch 103

Ch 101

LWORd (32 Bits):

Ch 201

Ch 101

  • If you are using handshaking (see CONFigure:DIGital:HANDshake command), the buffered read will start when the handshake occurs following the [SENSe:]DIGital:MEMory:STEP command.

  • This command overrides the pattern comparison mode (see [SENSe:]DIGital:MEMory:COMPare:ACTion command); therefore, you can use the [SENSe:]DIGital:MEMory:STEP command to step once if the bank is configured to start on a pattern compare.

  • If you send this command while a buffered read is already running, it will stop memory and step once. To resume a stopped buffered read, send the [SENSe:]DIGital:MEMory:STARt command.

Example

The following program segment configures a buffered read on channels 101 and 201 on the module in slot 3 and then reads one sample into memory.

CONF:DIG:WIDTH WORD,(@3101,3201)  !Width = 16 bits
DIG:MEM:SAMP:COUN 200,(@3101,3201)  !Sample count = 200
DIG:MEM:ENAB ON,(@3101,3201)  !Enable buffered reads
DIG:MEM:STEP (@3101,3201)
 !Read one sample into memory per channel

See Also

CONFigure:DIGital

CONFigure:DIGital:HANDshake

CONFigure:DIGital:WIDTh

[SENSe:]DIGital:MEMory:COMPare:ACTion

[SENSe:]DIGital:MEMory[:DATA]?

[SENSe:]DIGital:MEMory[:DATA]:ALL?

[SENSe:]DIGital:MEMory:ENABle

[SENSe:]DIGital:MEMory:MATCh[:DATA]?

[SENSe:]DIGital:MEMory:STARt

[SENSe:]DIGital:MEMory:STOP