Instrument Control (INSTR) Resource

This section contains information that applies to both Windows and Linux.

This topic describes the Instrument Control (INSTR) Resource that is provided to encapsulate the various operations of a device (reading, writing, triggering, etc.). It contains the following sections:

Related to this topic, see the Instrument Control (INSTR) Resource Events topic in the Using Events and Handlers book in this help file.

INSTR Resource Overview

The Instrument Control (INSTR) Resource, like any other resource, defines the basic operations and attributes of the VISA Resource Template. For example, modifying the state of an attribute is done via the operation viSetAttribute, which is defined in the VISA Resource Template.

Although the INSTR resource does not have viSetAttribute listed in its operations, it provides the operation because it is defined in the VISA Resource Template. From this basic set, each resource adds its specific operations and attributes that allow it to perform its dedicated task, such as sending a string to a message-based device.

The INSTR Resource lets a controller interact with the device associated with this resource, by providing the controller with services to send blocks of data to the device, request blocks of data from the device, send the device clear command to the device, trigger the device, and find information about the device's status. In addition, it allows the controller to access registers on devices that reside on memory-mapped buses.

INSTR Resource Attributes

ASRL Specific INSTR Resource Attributes

Attribute Name

Attribute Value

Access

Privilege

Type

Range

Default

VI_ATTR_ASRL_AVAIL_NUM

0x3FFF00ACUL

RO

Global

ViUInt32

0 to FFFFFFFFh

0

VI_ATTR_ASRL_BAUD

0x3FFF0021UL

RW

Global

ViUInt32

0 to FFFFFFFFh

9600

VI_ATTR_ASRL_CTS_STATE 

0x3FFF00AEUL

RO

Global

ViUInt16

VI_STATE_ASSERTED
VI_STATE_UNASSERTED
VI_STATE_UNKNOWN

N/A

VI_ATTR_ASRL_DATA_BITS

0x3FFF0022UL

RW

Global

ViUInt16

5 to 8

8

VI_ATTR_ASRL_DCD_STATE 

0x3FFF00AFUL

RO

Global

ViUInt16

VI_STATE_ASSERTED
VI_STATE_UNASSERTED
VI_STATE_UNKNOWN

N/A

VI_ATTR_ASRL_DSR_STATE

0x3FFF00B1UL

RO

Global

ViUInt16

VI_STATE_ASSERTED
VI_STATE_UNASSERTED
VI_STATE_UNKNOWN

N/A

VI_ATTR_ASRL_DTR_STATE

0x3FFF00B2UL

RW

Global

ViUInt16

VI_STATE_ASSERTED
VI_STATE_UNASSERTED
VI_STATE_UNKNOWN

N/A

VI_ATTR_ASRL_END_IN

0x3FFF00B3UL

RW

Local

ViUInt16

VI_ASRL_END_NONE
VI_ASRL_END_LAST_BIT
VI_ASRL_END_TERMCHAR

VI_ASRL_END_TERMCHAR

VI_ATTR_ASRL_END_OUT

0x3FFF00B4UL

RW

Local

ViUInt16

VI_ASRL_END_NONE
VI_ASRL_END_LAST_BIT
VI_ASRL_END_TERMCHAR
VI_ASRL_END_BREAK

VI_ASRL_END_NONE

VI_ATTR_ASRL_FLOW_CNTRL

0x3FFF0025UL

RW

Global

ViUInt16

VI_ASRL_FLOW_NONE
VI_ASRL_FLOW_XON_XOFF
VI_ASRL_FLOW_RTS_CTS
VI_ASRL_FLOW_DTR_DSR

VI_ASRL_FLOW_NONE

VI_ATTR_ASRL_PARITY

0x3FFF0023UL

RW

Global

ViUInt16

VI_ASRL_PAR_NONE
VI_ASRL_PAR_ODD
VI_ASRL_PAR_EVEN
VI_ASRL_PAR_MARK
VI_ASRL_PAR_SPACE

VI_ASRL_PAR_NONE

VI_ATTR_ASRL_REPLACE_CHAR

0x3FFF00BEUL

RW

Local

ViUInt8

0 to FFh

0

VI_ATTR_ASRL_RI_STATE

0x3FFF00BFUL

RO

Global

ViUInt16

VI_STATE_ASSERTED
VI_STATE_UNASSERTED
VI_STATE_UNKNOWN

N/A

VI_ATTR_ASRL_RTS_STATE

0x3FFF00C0UL

RW

Global

ViUInt16

VI_STATE_ASSERTED
VI_STATE_UNASSERTED
VI_STATE_UNKNOWN

N/A

VI_ATTR_ASRL_STOP_BITS

0x3FFF0024UL

RW

Global

ViUInt16

VI_ASRL_STOP_ONEVI_ASRL_STOP_TWO

VI_ASRL_STOP_ONE

VI_ATTR_ASRL_XOFF_CHAR

0x3FFF00C2UL

RW

Local

ViUInt8

0 to FFh

<Ctrl+S>(13h)

VI_ATTR_ASRL_XON_CHAR

0x3FFF00C1UL

RW

Local

ViUInt8

0 to FFh

<Ctrl+Q>(11h)

Generic INSTR Resource Attributes

Attribute Name

Attribute Value

Access

Privilege

Type

Range

Default

VI_ATTR_DMA_ALLOW_EN

 0x3FFF001EUL

RW

Local

ViBoolean

VI_TRUE
VI_FALSE

VI_TRUE

VI_ATTR_INTF_INST_NAME

 0xBFFF00E9UL

RO

Global

ViString

N/A

N/A

VI_ATTR_INTF_NUM

 0x3FFF0176UL

RO

Global

ViUInt16

0 to FFFFh

0

VI_ATTR_INTF_TYPE

 0x3FFF0171UL

RO

Global

ViUInt16

VI_INTF_VXI
VI_INTF_GPIB
VI_INTF_GPIB_VXI
VI_INTF_ASRL
VI_INTF_PXI
VI_INTF_TCPIP
VI_INTF_USB

N/A

 

VI_ATTR_TMO_VALUE

 0x3FFF001AUL

R/W

Local

ViUInt32

VI_TMO_IMMEDIATE
1 to FFFFFFFEh
VI_TMO_INFINITE

2000 msec

VI_ATTR_TRIG_ID

 0x3FFF0177UL

R/W*

Local

ViInt16

VI_TRIG_SW
VI_TRIG_TTL0 to VI_TRIG_TTL11
VI_TRIG_ECL0 to VI_TRIG_ECL1
VI_TRIG_STAR_SLOT1 to VI_TRIG_START_SLOT12
VI_TRIG_STAR_VXI0 to VI_TRIG_STAR_VXI2

VI_TRIG_SW

*The attribute VI_ATTR_TRIG_ID is RW (readable and writable) when the corresponding session is not enabled to receive trigger events. When the session is enabled to receive trigger events, the attribute VI_ATTR_TRIG_ID is RO (read only).

GPIB and GPIB-VXI Specific INSTR Resource Attributes

Attribute Name

Attribute Value

Access

Privilege

Type

Range

Default

VI_ATTR_GPIB_PRIMARY_ADDR

 0x3FFF0172UL

RO

Global

ViUInt16

0 to 30

N/A

VI_ATTR_GPIB_READDR_EN

 0x3FFF001BUL

R/W

Local

ViBoolean

VI_TRUE
VI_FALSE

VI_TRUE

VI_ATTR_GPIB_REN_STATE

 0x3FFF0181UL

RO

Global

ViInt16

VI_STATE_ASSERTED
VI_STATE_UNASSERTED
VI_STATE_UNKNOWN

N/A

VI_ATTR_GPIB_SECONDARY_ADDR

 0x3FFF0173UL

RO

Global

ViUInt16

0 to 31
VI_NO_SEC_ADDR

N/A

VI_ATTR_GPIB_UNADDR_EN

 0x3FFF0184UL

R/W

Local

ViBoolean

VI_TRUE
VI_FALSE

VI_FALSE

GPIB-VXI Specific INSTR Resource Attribute

This section contains information specific to the Windows product.

Attribute Name

Attribute Value

Access

Privilege

Type

Range

Default

VI_ATTR_INTF_PARENT_NUM

0x3FFF0101UL

RO

Global

ViUInt16

0 to FFFFh

VI_ATTR_INTF_PARENT_NUM

HiSLIP Specific INSTR Resource Attributes

Attribute Name

Attribute Value

Access

Privilege

Type

Range

Default

VI_ATTR_TCPIP_HISLIP_OVERLAP_EN

 0x3FFF0300UL

R/W

Local

ViBoolean

VI_TRUE, VI_FALSE

Preference returned by device

VI_ATTR_TCPIP_HISLIP_VERSION

 0x3FFF0301UL

RO

Local

ViVersion

N/A

N/A

VI_ATTR_TCPIP_HISLIP_MAX_MESSAGE_KB

 0x3FFF0302UL

R/W

Local

ViUInt32

0h -0 FFFFFFFFh

1024

VI_ATTR_TCPIP_HISLIP_ENCRYPTION_EN

0x3FFF0304UL

R/W

Local

ViBoolean

VI_TRUE, VI_FALSE

VI_FALSE

Message-Based INSTR Resource Attributes

Attribute Name

Attribute Value

Access

Privilege

Type

Range

Default

VI_ATTR_FILE_APPEND_EN

 0x3FFF0192UL

RW

Local

ViBoolean

VI_TRUE
VI_FALSE

VI_False

VI_ATTR_IO_PROT

 0x3FFF001CUL

R/W

Local

ViUInt16

VI_PROT_NORMAL
VI_PROT_FDC
VI_PROT_HS488
VI_PROT_4882_STRS
VI_PROT_USBTMC_VENDOR

For most devices:
   VI_PROT_NORMAL

For ASRL devices:
   VI_PROT_4882_STRS

VI_ATTR_RD_BUF_OPER_MODE

 0x3FFF002AUL

R/W

Local

ViUInt16

VI_FLUSH_ON_ACCESS
VI_FLUSH_DISABLE

VI_FLUSH_DISABLE

VI_ATTR_RD_BUF_SIZE

 0x3FFF002BUL

RO

Local

ViUInt32

N/A

N/A

VI_ATTR_SEND_END_EN

 0x3FFF0016UL

R/W

Local

ViBoolean

VI_TRUE
VI_FALSE

VI_TRUE

VI_ATTR_SUPPRESS_END_EN

 0x3FFF0036UL

R/W

Local

ViBoolean

VI_TRUE
VI_FALSE

VI_TRUE

 

VI_ATTR_TERMCHAR

 0x3FFF0018UL

R/W

Local

ViUInt8

0 to FFh

0ah (newline)

VI_ATTR_TERMCHAR_EN

 0x3FFF0038UL

R/W

Local

ViBoolean

VI_TRUE
VI_FALSE

VI_FALSE

VI_ATTR_WR_BUF_OPER_MODE

 0x3FFF002DUL

R/W

Local

ViUInt16

VI_FLUSH_ON_ACCESS
VI_FLUSH_WHEN_FULL

VI_FLUSH_WHEN_FULL

VI_ATTR_WR_BUF_SIZE

 0x3FFF002EUL

RO

Local

ViUInt32

N/A

N/A

PXI Specific INSTR Resource Attributes

This section contains information specific to the Windows product.

Attribute Name

Attribute Value

Access

Privilege

Type

Range

Default

VI_ATTR_PXI_ACTUAL_LWIDTH

0x3FFF0243UL

RO

Global

ViInt16

1, 4, 8

N/A

  

VI_ATTR_PXI_ALLOW_WRITE_COMBINE

 0x3FFF0246UL

RW

Local

ViBoolean

VI_TRUE, VI_FALSE

VI_FALSE

  

VI_ATTR_PXI_BUS_NUM

 0x3FFF0205UL

RO

Global

ViUInt16

0 to 255

N/A

  

VI_ATTR_PXI_CHASSIS

 0x3FFF0206UL

RO

Global

ViInt16

1 to 32767
VI_UNKNOWN_CHASSIS

N/A

  

VI_ATTR_PXI_DEV_NUM

 0x3FFF0201UL

RO

Global

ViUInt16

0 to 31

N/A

  

VI_ATTR_PXI_DSTAR_BUS

 0x3FFF0244UL

RO

Global

ViInt16

0 to 32767
VI_UNKNOWN_TRIG

N/A

  

VI_ATTR_PXI_DSTAR_SET

 0x3FFF0245UL

RO

Global

ViInt16

0 to 32767
VI_UNKNOWN_TRIG

N/A

  

VI_ATTR_PXI_FUNC_NUM

 0x3FFF0202UL

RO

Global

ViUInt16

0 to 7

N/A

  

VI_ATTR_PXI_IS_EXPRESS

 0x3FFF0240UL

RO

Global

ViBoolean

VI_TRUE, VI_FALSE

N/A

  

VI_ATTR_PXI_MAX_LWIDTH

 0x3FFF0242UL

RO

Global

ViInt16

1, 4, 8

N/A

  

VI_ATTR_PXI_MEM_BASE_BARn (where n is 0,1,2,3,4,5)

 (0x3FFF0221UL + n)

RO

Global

ViBusAddress

N/A

N/A

  

VI_ATTR_PXI_MEM_SIZE_BARn (where n is 0,1,2,3,4,5)

 (0x3FFF0231UL + n)

RO

Global

ViBusSize

N/A

N/A

  

VI_ATTR_PXI_MEM_TYPE_BARn (where n is 0,1,2,3,4,5)

 (0x3FFF0211UL + n)

RO

Global

ViUInt16

VI_PXI_ADDR_MEM,
VI_PXI_ADDR_IO,
VI_PXI_ADDR_NONE

N/A

  

VI_ATTR_PXI_SLOT_LBUS_LEFT

 0x3FFF0208UL

RO

Global

ViInt16

0 to 32767
VI_UNKNOWN_SLOT

N/A

  

VI_ATTR_PXI_SLOT_LBUS_RIGHT

 0x3FFF0209UL

RO

Global

ViInt16

0 to 32767
VI_UNKNOWN_SLOT

N/A

  

VI_ATTR_PXI_SLOT_LWIDTH

 0x3FFF0241UL

RO

Global

ViInt16

1, 4, 8

N/A

  
VI_ATTR_PXI_SLOT_OFFSET 0x3FFF0248UL RO Global ViUInt16 0 to M-1 where M is the slot width 0  
VI_ATTR_PXI_SLOT_WIDTH 0x3FFF0247UL RO Global ViUInt16 1 to N-1 where N is the number of slots in the PXI chassis. 1  

VI_ATTR_PXI_SLOTPATH

 0xBFFF0207UL

RO

Global

ViString

N/A

N/A

  

VI_ATTR_PXI_STAR_TRIG_BUS

 0x3FFF020BUL

RO

Global

ViInt16

0 to 32767
VI_UNKNOWN_TRIG

N/A

  

VI_ATTR_PXI_STAR_TRIG_LINE

 0x3FFF020CUL

RO

Global

ViInt16

0 to 32767
VI_UNKNOWN_TRIG

N/A

  

VI_ATTR_PXI_TRIG_BUS

 0x3FFF020AUL

RO

Global

ViInt16

0 to 32767
VI_UNKNOWN_TRIG

N/A

  

TCPIP Specific INSTR Resource Attributes

Attribute Name

Attribute Value

Access

Privilege

Data Type

Range

Default

VI_ATTR_TCPIP_ADDR

 0xBFFF0195UL

RW

Global

ViString

N/A

N/A

  

VI_ATTR_TCPIP_DEVICE_NAME

0xBFFF0199UL

RW

Global

ViString

N/A

N/A

  

VI_ATTR_TCPIP_HOSTNAME

0xBFFF0196UL

RW

Global

ViString

N/A

N/A

  

VI_ATTR_TCPIP_IS_HISLIP

 0x3FFF0303UL

RO

Global

ViBoolean

VI_TRUE,
VI_FALSE

N/A

  

VI_ATTR_TCPIP_SASL_MECHANISM

0xBFFF0274UL

RO

Local

ViString

N/A

N/A

  
VI_ATTR_TCPIP_SERVER_CERT 0xBFFF0276UL RO Local ViString N/A

N/A

  

VI_ATTR_TCPIP_SERVER_CERT_EXPIRATION_DATE

0xBFFF0272UL

RO

Local

ViString

N/A

N/A

  

VI_ATTR_TCPIP_SERVER_CERT_IS_PERPETUAL

0x3FFF0273UL

RO

Local

ViBoolean

VI_TRUE,
VI_FALSE

VI_FALSE

  
VI_ATTR_TCPIP_SERVER_CERT_SIZE 0x3FFF0277UL WO Local ViUInt32 1 to FFFFFFFFh N/A  

VI_ATTR_TCPIP_SERVER_CERT_SUBJECT_NAME

0xBFFF0271UL

RO

Local

ViString

N/A

N/A

  

VI_ATTR_TCPIP_SERVER_CERT_ISSUER_NAME

0xBFFF0270UL

RO

Local

ViString

N/A

N/A

  

VI_ATTR_TCPIP_TLS_CIPHER_SUITE

0xBFFF0275UL

RO

Local

ViString

N/A

N/A

  

USB Specific INSTR Resource Attributes

Attribute Name

Attribute Value

Access

Privilege

Data Type

Range

Default

VI_ATTR_USB_INTFC_NUM

 0x3FFF01A1UL

RO

Global

ViInt16

0 to 254

0

VI_ATTR_USB_MAX_INTR_SIZE

 0x3FFF01AFUL

RW

Local

ViUInt16

0 to FFFFh

N/A

VI_ATTR_USB_PROTOCOL

 0x3FFF01A7UL

RO

Global

ViInt16

0 to 255

N/A

VI_ATTR_USB_SERIAL_NUM

 0xBFFF01A0UL

RO

Global

ViString

N/A

N/A

VXI and GPIB-VXI Specific INSTR Resource Attributes 

This section contains information specific to the Windows product.

Attribute Name

Attribute Value

Access

Privilege

Data Type

Range

Default

VI_ATTR_CMDR_LA

0x3FFF006BUL

RO

Global

ViInt16

0 to 255;
VI_UNKNOWN_LA

N/A

  

VI_ATTR_DEST_ACCESS_PRIV

0x3FFF0039UL

RW

Local

ViUInt16

VI_DATA_NPRIV
VI_DATA_PRIV
VI_PROG_NPRIV
VI_PROG_PRIV
VI_BLCK_NPRIV
VI_BLCK_PRIV
VI_D64_NPRIV
VI_D64_PRIV

VI_DATA_PRIV

 

VI_ATTR_DEST_BYTE_ORDER

0x3FFF003AUL

RW

Local

ViUInt16

VI_BIG_ENDIAN
VI_LITTLE_ENDIAN

VI_BIG_ENDIAN

 

VI_ATTR_FDC_CHNL

0x3FFF000DUL

RW

Local

ViUInt16

0 to 7

N/A

  

VI_ATTR_FDC_GEN_SIGNAL_EN

0x3FFF0011UL

RW

Local

ViBoolean

VI_TRUE
VI_FALSE

VI_FALSE

 

VI_ATTR_FDC_MODE

0x3FFF000FUL

RW

Local

ViUInt16

VI_FDC_NORMAL VI_FDC_STREAM

VI_FDC_NORMAL

 

VI_ATTR_FDC_USE_PAIR

0x3FFF0013UL

RW

Local

ViBoolean

VI_TRUE
VI_FALSE

VI_FALSE

 

VI_ATTR_IMMEDIATE_SERV

0x3FFF0100UL

RO

Global

ViBoolean

VI_TRUE
VI_FALSE

N/A

  

VI_ATTR_MAINFRAME_LA

0x3FFF0070UL

RO

Global

ViInt16

0 to 255;
VI_UNKNOWN_LA

N/A

  

VI_ATTR_MEM_BASE_32

0x3FFF00ADUL

RO

Global

ViBusAddress

N/A

N/A

  

VI_ATTR_MEM_BASE_64

0x3FFF00D0UL

RO

Global

ViBusAddress64

N/A

N/A

  

VI_ATTR_MEM_SIZE_32

0x3FFF00DDUL

RO

Global

ViBusSize

N/A

N/A

  

VI_ATTR_MEM_SIZE_64

0x3FFF00D1UL

RO

Global

ViBusSize64

N/A

N/A

  

VI_ATTR_MEM_SPACE

0x3FFF00DEUL

RO

Global

ViUInt16

VI_A16_SPACE
VI_A24_SPACE
VI_A32_SPACE
VI_A64_SPACE

VI_A16_SPACE

 

VI_ATTR_SRC_ACCESS_PRIV

0x3FFF003CUL

RW

Local

ViUInt16

VI_DATA_NPRIV
VI_DATA_PRIV
VI_PROG_NPRIV
VI_PROG_PRIV
VI_BLCK_NPRIV
VI_BLCK_PRIV
VI_D64_NPRIV
VI_D64_PRIV

VI_DATA_PRIV

 

VI_ATTR_SRC_BYTE_ORDER

0x3FFF003DUL

RW

Local

ViUInt16

VI_BIG_ENDIAN
VI_LITTLE_ENDIAN

VI_BIG_ENDIAN

 

VI_ATTR_VXI_DEV_CLASS

0x3FFF006CUL

RO

Global

ViUInt16

VI_VXI_CLASS_MEMORY
VI_VXI_CLASS_EXTENDED
VI_VXI_CLASS_MESSAGE
VI_VXI_CLASS_REGISTER
VI_VXI_CLASS_OTHER

N/A

  

VI_ATTR_VXI_LA

0x3FFF00D5UL

RO

Global

ViInt16

0 to 511

N/A

  

VI_ATTR_VXI_TRIG_SUPPORT

 0x3FFF0194UL

RO

Global

ViUInt32

N/A

N/A

  

VI_ATTR_WIN_ACCESS_PRIV

0x3FFF0045UL

RW*

Local

ViUInt16

VI_DATA_NPRIV
VI_DATA_PRIV
VI_PROG_NPRIV
VI_PROG_PRIV
VI_BLCK_NPRIV
VI_BLCK_PRIV

VI_DATA_PRIV

 

VI_ATTR_WIN_BYTE_ORDER

0x3FFF0047UL

RW*

Local

ViUInt16

VI_BIG_ENDIAN
VI_LITTLE_ENDIAN

VI_BIG_ENDIAN

 

*For VISA 2.2, the attributes VI_ATTR_WIN_BYTE_ORDER and VI_ATTR_WIN_ACCESS_PRIV are R/W (readable and writeable) when the corresponding session is not mapped (VI_ATTR_WIN_ACCESS == VI_NMAPPED). When the session is mapped, these attributes are RO (read only).

VXI and GPIB-VXI and PXI Specific INSTR Resource Attributes

This section contains information specific to the Windows product.

Attribute Name

Attribute Value

Access

Privilege

Data Type

Range

Default

VI_ATTR_DEST_INCREMENT

0x3FFF0041UL

RW

Local

ViInt32

0 to 1

1

VI_ATTR_SLOT

0x3FFF00E8UL

RO

Global

ViInt16

0 to 18;
VI_UNKNOWN_SLOT

N/A

VI_ATTR_SRC_INCREMENT

0x3FFF0040UL

RW

Local

ViInt32

0 to 1

1

VI_ATTR_WIN_ACCESS

0x3FFF00C3UL

RO

Local

ViUInt16

VI_NMAPPED
VI_USE_OPERS
VI_DEREF_ADDR

VI_NMAPPED

VI_ATTR_WIN_BASE_ADDR_32

0x3FFF0098UL

RO

Local

ViBusAddress

N/A

N/A

VI_ATTR_WIN_BASE_ADDR_64

0x3FFF009BUL

RO

Local

ViBusAddress64

N/A

N/A

VI_ATTR_WIN_SIZE_32

0x3FFF009AUL

RO

Local

ViBusSize

N/A

N/A

VI_ATTR_WIN_SIZE_64

0x3FFF009CUL

RO

Local

ViBusSize64

N/A

N/A

VXI and GPIB-VXI and USB Specific INSTR Resource Attributes

Attribute Name

Attribute Value

Access Privilege

Data Type

Range

Default

VI_ATTR_4882_COMPLIANT

 0x3FFF019FUL

RO

Global

ViBoolean

VI_TRUE, VI_FALSE

N/A

  

VXI and GPIB-VXI and USB and PXI Specific INSTR Resource Attributes

Attribute Name

Attribute Name

Access Privilege

Data Type

Range

Default

VI_ATTR_MANF_ID

 0x3FFF00D9UL

RO

Global

ViUInt16

0 to FFFFh

 N/A

VI_ATTR_MANF_NAME

 0xBFFF0072UL

RO

Global

ViString

N/A

 N/A

VI_ATTR_MODEL_CODE

 0x3FFF00DFUL

RO

Global

ViUInt16

0 to FFFFh

 0

VI_ATTR_MODEL_NAME

 0xBFFF0077UL

RO

Global

ViString

N/A

 N/A

INSTR Resource Attribute Descriptions

These descriptions apply to the above attributes. If a section or attribute was marked Windows-only above, that classification will apply to these descriptions as well.

Attribute Name

Description

ASRL Specific INSTR Resource Attributes

VI_ATTR_ASRL_AVAIL_NUM

This attribute shows the number of bytes available in the global receive buffer.

VI_ATTR_ASRL_BAUD

This is the baud rate of the interface. It is represented as an unsigned 32-bit integer so that any baud rate can be used, but it usually requires a commonly used rate such as 300, 1200, 2400, or 9600 baud.

VI_ATTR_ASRL_CTS_STATE

This attribute shows the current state of the Clear To Send (CTS) input signal.

VI_ATTR_ASRL_DATA_BITS

This is the number of data bits contained in each frame (from 5 to 8). The data bits for each frame are located in the low-order bits of every byte stored in memory.

VI_ATTR_ASRL_DCD_STATE

This attribute shows the current state of the Data Carrier Detect (DCD) input signal. The DCD signal is often used by modems to indicate the detection of a carrier (remote modem) on the telephone line. The DCD signal is also known as "Receive Line Signal Detect (RLSD)."

VI_ATTR_ASRL_DSR_STATE

This attribute shows the current state of the Data Set Ready (DSR) input signal.

VI_ATTR_ASRL_DTR_STATE

This attribute is used to manually assert or unassert the Data Terminal Ready (DTR) output signal.

VI_ATTR_ASRL_END_IN

This attribute indicates the method used to terminate read operations. If it is set to VI_ASRL_END_NONE, the read will not terminate until all of the requested data is received (or an error occurs).

If it is set to VI_ASRL_END_TERMCHAR, the read will terminate as soon as the character in VI_ATTR_TERMCHAR is received. If it is set to VI_ASRL_END_LAST_BIT, the read will terminate as soon as a character arrives with its last bit set. For example, if VI_ATTR_ASRL_DATA_BITS is set to 8, then the read will terminate when a character arrives with the 8th bit set.

VI_ATTR_ASRL_END_OUT

This attribute indicates the method used to terminate write operations. If it is set to VI_ASRL_END_NONE, the write will not append anything to the data being written. If it is set to VI_ASRL_END_BREAK, the write will transmit a break after all the characters for the write have been sent.

If it is set to VI_ASRL_END_LAST_BIT, the write will send all but the last character with the last bit clear, then transmit the last character with the last bit set. For example, if  VI_ATTR_ASRL_DATA_BITS is set to 8, the write will clear the 8th bit for all but the last character, then transmit the last character with the 8th bit set. If it is set to VI_ASRL_END_TERMCHAR, the write will send the character in VI_ATTR_TERMCHAR after the data being transmitted.

VI_ATTR_ASRL_FLOW_CNTRL

If this attribute is set to VI_ATTR_ASRL_FLOW_NONE, the transfer mechanism does not use flow control, and buffers on both sides of the connection are assumed to be large enough to hold all data transferred.

If this attribute is set to VI_ATTR_ASRL_FLOW_XON_XOFF, the transfer mechanism uses the XON and XOFF characters to perform flow control. The transfer mechanism controls input flow by sending XOFF when the receive buffer is nearly full, and it controls the output flow by suspending transmission when XOFF is received.

If this attribute is set to VI_ATTR_ASRL_FLOW_RTS_CTS, the transfer mechanism uses the RTS output signal and the CTS input signal to perform flow control. The transfer mechanism controls input flow by unasserting the RTS signal when the receive buffer is nearly full, and it controls output flow by suspending the transmission when the CTS signal is unasserted.

If this attribute is set to VI_ASRL_FLOW_DTR_DSR, the transfer mechanism uses the DTR output signal and the DSR input signal to perform flow control. The transfer mechanism controls input flow by unasserting the DTR signal when the receive buffer is nearly full, and it controls output flow by suspending the transmission when the DSR signal is unasserted.

This attribute can specify multiple flow control mechanisms by bit-ORing multiple values together. However, certain combinations may not be supported by all serial ports and/or operating systems. See ASRL Flow Control Combinations for details.

VI_ATTR_ASRL_PARITY

This is the parity used with every frame transmitted and received. VI_ASRL_PAR_MARK means that the parity bit exists and is always 1. VI_ASRL_PAR_SPACE means that the parity bit exists and is always 0.

VI_ATTR_ASRL_REPLACE_CHAR

This attribute specifies the character to be used to replace incoming characters that arrive with errors (such as parity error.)

VI_ATTR_ASRL_RI_STATE

This attribute shows the current state of the Ring Indicator (RI) input signal. The RI signal is often used by modems to indicate that the telephone line is ringing.

VI_ATTR_ASRL_RTS_STATE

This attribute is used to manually assert or unassert the Request To Send (RTS) output signal. When the VI_ATTR_ASRL_FLOW_CNTRL attribute is set to VI_ASRL_FLOW_RTS_CTS, this attribute is ignored when changed, but can be read to determine whether the background flow control is asserting or unasserting the signal.

VI_ATTR_ASRL_STOP_BITS

This is the number of stop bits used to indicate the end of a frame. The value VI_ASRL_STOP_ONE5 indicates one-and-one-half (1.5) stop bits.

VI_ATTR_ASRL_XOFF_CHAR

This attribute specifies the value of the XOFF character used for XON/XOFF flow control (both directions). If XON/XOFF flow control (software handshaking) is not being used, the value of this attribute is ignored.

VI_ATTR_ASRL_XON_CHAR

This attribute specifies the value of the XON character used for XON/XOFF flow control (both directions). If XON/XOFF flow control (software handshaking) is not being used, the value of this attribute is ignored.

Generic INSTR Resource Attributes

VI_ATTR_DMA_ALLOW_EN

This attribute specifies whether I/O accesses should use DMA (VI_TRUE)
or Programmed I/O (VI_FALSE). In some implementations, this attribute may have global effects even though it is documented to be a local attribute. Since this affects performance and not functionality, that behavior is acceptable.

VI_ATTR_INTF_INST_NAME

Human-readable text describing the given interface.

VI_ATTR_INTF_NUM

Board number for the given interface.

VI_ATTR_INTF_TYPE

Interface type of the given session.

VI_ATTR_TMO_VALUE

Minimum timeout value to use, in milliseconds. A timeout value of VI_TMO_IMMEDIATE means that operations should never wait for the device to respond. A timeout value of VI_TMO_INFINITE disables the timeout mechanism.

VI_ATTR_TRIG_ID

Identifier for the current triggering mechanism.

GPIB and GPIB-VXI Specific INSTR Resource Attributes

VI_ATTR_GPIB_PRIMARY_ADDR

Primary address of the GPIB device used by the given session.

VI_ATTR_GPIB_READDR_EN

This attribute specifies whether to use repeat addressing before each read or write operation.

VI_ATTR_GPIB_REN_STATE

This attribute returns the current state of the GPIB REN interface line.

VI_ATTR_GPIB_SECONDARY_ADDR

Secondary address of the GPIB device used by the given session.

VI_ATTR_GPIB_UNADDR_EN 

This attribute specifies whether to unaddress the device (UNT and UNL) after each read or write operation.

GPIB-VXI Specific INSTR Resource Attribute

VI_ATTR_INTF_PARENT_NUM

Board number of the GPIB board to which the GPIB-VXI is attached.

HiSLIP Specific INSTR Resource Attributes

VI_ATTR_TCPIP_HISLIP_OVERLAP_EN

This enables HiSLIP overlap mode and its value defaults to the mode suggested by the instrument on HiSLIP connection. If enabled, the connection uses overlap mode to allow overlapped responses. If disabled, the connection uses synchronous mode to detect and recover from interrupted errors. If changed, VISA will do a Device Clear operation to change the mode.

VI_ATTR_TCPIP_HISLIP_VERSION

This is the HiSLIP protocol version used for a particular HiSLIP connection. For example, HiSLIP version 1.0 returns a ViVersion value of 0x00100000.

VI_ATTR_TCPIP_HISLIP_MAX_MESSAGE_KB

This is the maximum HiSLIP message size VISA will accept from a HiSLIP system in units of kilobytes (1024 bytes). Defaults to 1024 (a 1 MB maximum message size).

VI_ATTR_TCPIP_HISLIP_ENCRYPTION_EN

This is used to control and indicate if the communication is encrypted. True indicates communication is currently encrypted, false unencrypted. If encryption is not enabled and the attribute is set to true, encryption is turned on. If encryption is enabled and the attribute is set to false, encryption is turned off. If the connection does not support encryption, the attribute will always be false.

  

Message-Based INSTR Resource Attributes

 

VI_ATTR_FILE_APPEND_EN

This attribute specifies whether viReadToFile will overwrite (truncate) or append when opening a file.

VI_ATTR_IO_PROT

Specifies which protocol to use. In VXI systems, for example, you can choose between normal word serial or fast data channel (FDC).

In GPIB, you can choose between normal and high-speed (HS488) data transfers. In ASRL systems, you can choose between normal and 488-style transfers, in which case the viAssertTrigger/viReadSTB/viClear operations send  488.2-defined strings.

VI_ATTR_RD_BUF_OPER_MODE

Determines the operational mode of the read buffer. When the operational mode is set to VI_FLUSH_DISABLE (default), the buffer is flushed only on explicit calls to viFlush. If the operational mode is set to VI_FLUSH_ON_ACCESS, the buffer is flushed every time a viScanf operation completes.

VI_ATTR_RD_BUF_SIZE

This attribute specifies the size of the formatted I/O read buffer.  The user can modify this value by calling viSetBuf.

VI_ATTR_SEND_END_EN

Whether to assert END during the transfer of the last byte of the buffer.

VI_ATTR_SUPPRESS_END_EN

Whether to suppress the END indicator termination. If this attribute is set to  VI_TRUE, the END indicator does not terminate read operations. If this attribute is set to VI_FALSE, the END indicator terminates read operations.

VI_ATTR_TERMCHAR

Termination character. When the termination character is read and  VI_ATTR_TERMCHAR_EN is enabled during a read operation, the read operation terminates.

VI_ATTR_TERMCHAR_EN

Flag that determines whether the read operation should terminate when a termination character is received.

VI_ATTR_WR_BUF_OPER_MODE

Determines the operational mode of the write buffer. When the operational mode is set to VI_FLUSH_WHEN_FULL (default), the buffer is flushed when an END indicator is written to the buffer or when the buffer fills up.

If the operational mode is set to VI_FLUSH_ON_ACCESS, the write buffer is flushed under the same conditions, and also every time a viPrintf operation completes.

VI_ATTR_WR_BUF_SIZE

This attribute specifies the size of the formatted I/O write buffer.  The user can modify this value by calling viSetBuf.

PXI Specific INSTR Resource Attributes

VI_ATTR_PXI_ACTUAL_LWIDTH

Specifies the negotiated link width that this device is using.

VI_ATTR_PXI_ALLOW_WRITE_COMBINE

Specifies whether the implementation should attempt to combine bus write transfers into a larger transfer before bursting over the PCI bus.

VI_ATTR_PXI_BUS_NUM

PCI bus number of this device.

VI_ATTR_PXI_CHASSIS

Chassis number in which this device is located.

VI_ATTR_PXI_DEV_NUM

PCI device number of this device.

VI_ATTR_PXI_DSTAR_BUS

Number of the DSTAR bus connected to this device in the chassis.

VI_ATTR_PXI_DSTAR_SET

Specifies the set of PXI_DSTAR lines connected to this device.

VI_ATTR_PXI_FUNC_NUM

PCI function number of the device. All devices have a function 0. Multifunction devices will also support other function numbers.

VI_ATTR_PXI_IS_EXPRESS

Specifies whether this device is PXI Express.

VI_ATTR_PXI_MAX_LWIDTH

Specifies the maximum link width that this device can use.

VI_ATTR_PXI_MEM_BASE_BARn

Memory base address assigned to the specified BAR for this device.

VI_ATTR_PXI_MEM_SIZE_BARn

Size of the memory assigned to the specified BAR for this device.

VI_ATTR_PXI_MEM_TYPE_BARn

Memory type (memory mapped or I/O mapped) used by the device in the specified BAR.

VI_ATTR_PXI_SLOT_LBUS_LEFT

Slot number or special feature connected to the local bus left lines of this device.

VI_ATTR_PXI_SLOT_LBUS_RIGHT

Slot number or special feature connected to the local bus right lines of this device.

VI_ATTR_PXI_SLOT_LWIDTH

Specifies the link width used by the slot in which this device is located.
VI_ATTR_PXI_SLOT_OFFSET The number of slots a module occupies adjacent to the slot where the device connects to the PXI backplane. The value for non-PXI Express devices is always 0.  
VI_ATTR_PXI_SLOT_WIDTH The number of slots the device occupies. The value for non-PXI Express devices is always 1.  

VI_ATTR_PXI_SLOTPATH

Slot path of this device. PXI slot paths are a sequence of values representing the PCI device number and function number of a PCI module and each parent PCI bridge that routes the module to the host PCI bridge. The string format of the attribute value is device1[.function1][,device2[.function2]][,...].

VI_ATTR_PXI_STAR_TRIG_BUS

Number of the star trigger bus connected to this device in the chassis.

VI_ATTR_PXI_STAR_TRIG_LINE

PXI_STAR line connected to this device.

VI_ATTR_PXI_TRIG_BUS

Number of the trigger bus connected to this device in the chassis.

TCPIP-Specific INSTR Resource Attributes

VI_ATTR_TCPIP_ADDR

This is the TCPIP address of the device to which the session is connected. This string is formatted in dot-notation.

VI_ATTR_TCPIP_DEVICE_NAME

This specifies the LAN device name used by the VXI-11 protocol during connection.

VI_ATTR_TCPIP_HOSTNAME

This specifies the host name of the device. If no host name is available, this attribute returns an empty string.

VI_ATTR_TCPIP_IS_HISLIP

This specifies whether this resource uses the HiSLIP protocol.

VI_ATTR_TCPIP_SASL_MECHANISM

Returns a string that indicates the SASL mechanism used to authenticate the client. The string is as defined by IANA in: https://www.iana.org/assignments/sasl-mechanisms/sasl-mechanisms.xhtml.

  
VI_ATTR_TCPIP_SERVER_CERT It is the full text of the server certificate in the RFC 5652 PEM format.  

VI_ATTR_TCPIP_SERVER_CERT_EXPIRATION_DATE

The expiration date of the server certificate. The form is ASN.1 UTCTime “YYMMDDhhmm[ss]Z”.

  

VI_ATTR_TCPIP_SERVER_CERT_IS_PERPETUAL

Indicates the certificate does not expire. Note that this may indicate that the certificate is from an IDevID.

  
VI_ATTR_TCPIP_SERVER_CERT_SIZE It is the buffer size required to hold the full text of the server certificate in RFC 5652 PEM format.  

VI_ATTR_TCPIP_SERVER_CERT_SUBJECT_NAME

The subject field from the certificate. That is, the entity associated with the public key in the certificate.

  

VI_ATTR_TCPIP_SERVER_CERT_ISSUER_NAME

The name of the CA that signed the certificate . For an LDevId, this will indicate the name of the PKI CA.

  

VI_ATTR_TCPIP_TLS_CIPHER_SUITE

Returns a string that indicates the cipher suite used by TLS, which tells the user something about the security of the connection. For details, refer to https://www.iana.org/assignments/tls-parameters/tls-parameters.xml. For example, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384.

  

USB Specific INSTR Resource Attributes

VI_ATTR_USB_INTFC_NUM

Specifies the USB interface number of this device to which this session is connected.

VI_ATTR_USB_MAX_INTR_SIZE

Specifies the maximum number of bytes that this USB device will send on the interrupt IN pipe.  The default value is the same as the maximum packet size of the interrupt IN pipe.

VI_ATTR_USB_PROTOCOL

Specifies the USB protocol number.

VI_ATTR_USB_SERIAL_NUM

This string attribute is the serial number of the USB instrument.  The value of this attribute should be used for display purposes only and not for programmatic decisions.

VXI and GPIB-VXI Specific INSTR Resource Attributes

VI_ATTR_CMDR_LA

Logical address of the commander of the VXI device used by the given session.

VI_ATTR_DEST_ACCESS_
PRIV

This attribute specifies the address modifier to be used in high-level access operations, such as viOutXX and viMoveOutXX, when writing to the destination.

VI_ATTR_DEST_BYTE_ORDER

This attribute specifies the byte order to be used in high-level access operations, such as viOutXX and viMoveOutXX, when writing to the destination

VI_ATTR_FDC_CHNL

This attribute determines which FDC channel will be used to transfer the buffer.

VI_ATTR_FDC_GEN_SIGNAL_EN

Setting this attribute to VI_TRUE lets the servant send a signal when control of the FDC channel is passed back to the commander. This action frees the commander from having to poll the FDC header while engaging in an FDC transfer.

VI_ATTR_FDC_MODE

This attribute determines which FDC mode to use (Normal mode or Stream mode).

VI_ATTR_FDC_USE_PAIR

If set to VI_TRUE, a channel pair will be used for transferring data. Otherwise, only one channel will be used.

VI_ATTR_IMMEDIATE_SERV

Specifies whether the given device is an immediate servant of the controller running VISA.

VI_ATTR_MAINFRAME_LA

This is the logical address of a given device in the mainframe, usually the device with the lowest logical address. Other possible values include the logical address of the Slot 0 controller or of the parent-side extender. Often, these are all the same value. The purpose of this attribute is to provide a unique ID for each mainframe. A VISA manufacturer can choose any of these values, but must be consistent across mainframes. If this value is not known, the attribute value returned is VI_UNKNOWN_LA.

VI_ATTR_MEM_BASE_32
VI_ATTR_MEM_BASE_64

Base address of the device in VXIbus memory address space. This base address is applicable to A24 or A32 address space.

VI_ATTR_MEM_SIZE_32
VI_ATTR_MEM_SIZE_64

Size of memory requested by the device in VXIbus address space.

VI_ATTR_MEM_SPACE

VXIbus address space used by the device. The four types are A16 only, A16/A24, A16/A32, or or A16/A64 memory address space.

VI_ATTR_SRC_ACCESS_PRIV

This attribute specifies the address modifier to be used in high-level access operations, such as viInXX and viMoveInXX, when reading from the source.

VI_ATTR_SRC_BYTE_ORDER

This attribute specifies the byte order to be used in high-level access operations, such as viInXX and viMoveInXX, when reading from the source.

VI_ATTR_VXI_DEV_CLASS

This attribute represents the VXI-defined device class to which
the resource belongs:

  • message based (VI_VXI_CLASS_MESSAGE)
  • register based (VI_VXI_CLASS_REGISTER)
  • extended (VI_VXI_CLASS_EXTENDED)
  • memory (VI_VXI_CLASS_MEMORY)

VME devices are usually either register based or belong to a miscellaneous class (VI_VXI_CLASS_OTHER)

VI_ATTR_VXI_LA

Logical address of the VXI or VME device used by the given session. For a VME device, the logical address is actually a pseudo-address in the range 256 to 511.

VI_ATTR_VXI_TRIG_SUPPORT

This attribute shows which VXI trigger lines this implementation supports. This is a bit vector with bits 0-9 corresponding to VI_TRIG_TTL0 through VI_TRIG_ECL1.

VI_ATTR_WIN_ACCESS_PRIV

This attribute specifies the address modifier to be used in low-level access operations, such as viMapAddress, viPeekXX and viPokeXX, when accessing the mapped window.

VI_ATTR_WIN_BYTE_ORDER

This attribute specifies the byte order to be used in low-level access operations, such as viMapAddress, viPeekXX and viPokeXX, when accessing the mapped window.

VXI and GPIB-VXI and PXI Specific INSTR Resource Attributes

VI_ATTR_DEST_INCREMENT

This is used in the viMoveOutXX operation to specify how much the destination offset is to be incremented after every transfer. The default value of this attribute is 1 (that is, the destination address will be incremented by 1 after each transfer, and the viMoveOutXX operation moves into consecutive elements.

If this attribute is set to 0, the viMoveOutXX operation will always write to the same element, essentially treating the destination as a FIFO register.

VI_ATTR_SLOT

Physical slot location of the device. If the slot number is not known, VI_UNKNOWN_SLOT is returned.

VI_ATTR_SRC_INCREMENT

This is used in the viMoveInXX operation to specify how much the source offset is to be incremented after every transfer. The default value of this attribute is 1 (that is, the source address will be incremented by 1 after each transfer), and the viMoveInXX operation moves from consecutive elements. If this attribute is set to 0, the viMoveInXX operation will always read from the same element, essentially treating the source as a FIFO register.

VI_ATTR_WIN_ACCESS

Modes in which the current window may be accessed: not currently mapped, through operations viPeekXX and viPokeXX only, or through operations and/or by directly dereferencing the address parameter as a pointer.

VI_ATTR_WIN_BASE_ADDR_32
VI_ATTR_WIN_BASE_ADDR_64

Base address of the interface bus to which this window is mapped.

VI_ATTR_WIN_SIZE_32
VI_ATTR_WIN_SIZE_64

Size of the region mapped to this window.

VXI, GPIB-VXI, and USB Specific INSTR Resource Attributes

VI_ATTR_4882_COMPLIANT

Specifies whether the device is 488.2 compliant.

VXI and GPIB-VXI and USB and PXI Specific INSTR Resource Attributes

VI_ATTR_MANF_ID

Manufacturer identification number of the device. For PXI, if Subsystem ID and Subsystem Vendor ID are defined for the device, this attribute value is the Subsystem Vendor ID. If Subsystem ID and Subsystem Vendor ID are not defined for the device, this attribute value is the PCI Vendor ID.

VI_ATTR_MANF_NAME

This string attribute is the manufacturer’s name. The value of this attribute should be used for display purposes only and not for programmatic decisions, as the value can be different between VISA implementations and/or revisions.

VI_ATTR_MODEL_CODE

Model code for the device. For PXI, If Subsystem ID and Subsystem Vendor ID are defined for the device, then this attribute value is the Subsystem ID. If Subsystem ID and Subsystem Vendor ID are not defined for the device, this attribute value is the PCI Device ID.

VI_ATTR_MODEL_NAME

This string attribute is the model name of the device. The value of this attribute should be used for display purposes only and not for programmatic decisions, as the value can be different between VISA implementations and/or revisions.

INSTR Resource Operations

viAssertTrigger (vi, protocol)

viBufRead (vi, buf, count, retCount)

viBufWrite (vi, buf, count, retCount)

viClear (vi)

viFlush (vi, mask)

viGpibControlREN (vi, mode)

 

viIn8 (vi, space, offset, val8)

viIn16 (vi, space, offset, val16)

viIn32 (vi, space, offset, val32)

viIn64 (vi, space, offset, val64) 

 

viMapAddress (vi, mapSpace, mapBase, mapSize, access, suggested, address)

viMapAddressEx (vi, mapSpace, mapBase64, mapSize, access, suggested, address)

viMemAlloc (vi, size, offset)

viMemAllocEx (vi, size, offset64)

viMemFree (vi, offset)

viMemFreeEx (vi, offset64) 

 

viMove (vi, srcSpace, srcOffset, srcWidth, destSpace, destOffset, destWidth, length)

viMoveEx (vi, srcSpace, srcOffset64, srcWidth, destSpace, destOffset64, destWidth, length) 

viMoveAsync (vi, srcSpace, srcOffset, srcWidth, destSpace, destOffset, destWidth, length, jobId)

viMoveAsyncEx (vi, srcSpace, srcOffset64, srcWidth, destSpace, destOffset64, destWidth, length, jobId) 

 

viMoveIn8 (vi, space, offset, length, buf8)

viMoveIn16 (vi, space, offset, length, buf16)

viMoveIn32 (vi, space, offset, length, buf32)

viMoveIn64 (vi, space, offset, length, buf64)

 

viMoveIn8Ex(vi, space, offset64, length, buf8)

viMoveIn16Ex(vi, space, offset64, length, buf16)

viMoveIn32Ex(vi, space, offset64, length, buf32)

viMoveIn64Ex(vi, space, offset64, length, buf64)

 

viMoveOut8 (vi, space, offset, length, buf8)

viMoveOut16 (vi, space, offset, length, buf16)

viMoveOut32 (vi, space, offset, length, buf32)

viMoveOut64 (vi, space, offset, length, buf64)

 

viMoveOut8Ex(vi, space, offset64, length, buf8)

viMoveOut16Ex(vi, space, offset64, length, buf16)

viMoveOut32Ex(vi, space, offset64, length, buf32)

viMoveOut64Ex(vi, space, offset64, length, buf64)

 

viOut8 (vi, space, offset, val8)

viOut16 (vi, space, offset, val16)

viOut32 (vi, space, offset, val32)

viOut64 (vi, space, offset, val64)

 

viPeek8 (vi, addr, val8)

viPeek16 (vi, addr, val16)

viPeek32 (vi, addr, val32)

viPeek64 (vi, addr, val64)

viPoke8 (vi, addr, val8)

viPoke16 (vi, addr, val16)

viPoke32 (vi, addr, val32)

viPoke64 (vi, addr, val64) 

 

viPrintf (vi, writeFmt, arg1, arg2, ...)

viQueryf (vi, writeFmt, readFmt, arg1, arg2, ...)

viRead (vi, buf, count, retCount)

viReadAsync (vi, buf, count, jobId)

viReadSTB (vi, status)

viReadToFile (vi, fileName, count, retCount)

viScanf (vi, readFmt, arg1, arg2, ...)

viSetBuf (vi, mask, size)

viSPrintf (vi, buf, writeFmt, arg1, arg2, ...)

viSScanf (vi, buf, readFmt, arg1, arg2, ...)

 

viUnmapAddress (vi)

viUsbControlIn(vi, bmRequestType, bRequest, wValue, wIndex, wLength, buf, retCnt)

viUsbControlOut(vi, bmRequestType, bRequest, wValue, wIndex, wLength, buf)

 

viVPrintf (vi, writeFmt, params)

viVQueryf (vi, writeFmt, readFmt, params)

viVScanf (vi, readFmt, params)

viVSPrintf (vi, buf, writeFmt, params)

viVSScanf (vi, buf, readFmt, params)

viVxiCommandQuery (vi, mode, cmd, response)

viWrite (vi, buf, count, retCount)

viWriteAsync (vi, buf, count, jobId)

viWriteFromFile (vi, fileName, count, retCount)