Write/Read

About VISAPassthrough

Description

Initiates a VISA pass-through session for a device, and returns a unique session ID to be used whenever communicating with that device. Pass-through sessions can be closed by using the Close method, the Reset method, or by properly shutting down the instrument or the analyzer application. Presetting the instrument will not close existing pass-through sessions.

Note: When opening a socket session (addresses of type: “TCPIP[board]::host address::port::SOCKET”) , you must use the appropriate VISA Address for the identifier argument. Using an alias to open a socket session is not currently supported. Aliases are allowed for all other types of supported sessions.

VB Syntax

value = Vpassthru.Open (identifier, timeoutVal)

Variable

(Type) - Description

value

(long) - Variable to store the returned session ID.

Vpassthru

(object) -  A VISAPassthrough object

identifier

(string) VISA address, or VISA alias of the device to be controlled.

timeoutVal

(long) The amount of time (in milliseconds) to wait for a response from the remote device after sending a command.  A "timeout" error is displayed after this time has passed without a response.

Return Type

Long

Default

Not Applicable

Examples

value=Vpassthru.Open("TCPIP0::A-N5242A-10096::hislip1::INSTR",1000)

value=Vpassthru.Open("MyAlias",5000)

C++ Syntax

HRESULT Open(BSTR visaIdentifier, long timeOut, long* sessionID)

Interface

IVISAPassthrough