IAsyncMessage::AssertTrigger

Description

Asserts a software or hardware trigger dependent on the interface type. For a GPIB device, the device is addressed to listen, and then the GPIB GET command is sent. For a VXI device, if VI_ATTR_TRIG_ID is VI_TRIG_SW, then the device is sent the Word Serial Trigger command; if VI_ATTR_TRIG_ID is any other value, a hardware trigger is sent on the line corresponding to the value of that attribute.

For GPIB and VXI software triggers, TRIG_PROT_DEFAULT is the only valid protocol. For VXI hardware triggers, TRIG_PROT_DEFAULT is equivalent to TRIG_PROT_SYNC.

VB Prototype

AssertTrigger(
  protocol As TriggerProtocol ' Optional Parameter
)

C++ Prototype

HRESULT AssertTrigger(
  TriggerProtocol protocol
);

Parameters

protocol

[Optional in Visual Basic] The protocol to use.

Return Value

Refer to the table of return codes.

See Also

ComponentVersion, SpecVersion, HardwareInterfaceName, HardwareInterfaceNumber, HardwareInterfaceType, LockState, OptionString, ProgID, ResourceName, SessionType, SoftwareManufacturerID, SoftwareManufacturerName, Timeout, LastStatus, IOProtocol, SendEndEnabled, TerminationCharacter, TerminationCharacterEnabled, GetAttribute, SetAttribute, LockRsrc, UnlockRsrc, Init, Close, AssertTrigger, Clear, ReadSTB, Read, Write, WriteString, Terminate, IAsyncMessage Overview