National Instruments 321645c-01

Chapter 2 Function Reference — Config_DAQ_Eve nt_Message

National Instruments Corporation 2-77 NI-DAQ FRM for PC Compatibles

DAQEvent=3 through 8—These DAQEvents are for interrupt-driven data acquisition only.

See Set_DAQ_Device_Info for switching between interrupt-driven and DMA-driven data

acquisition.

If you are using a DIO 6533 device in pattern match trigger mode, you cannot select

DAQEvent 7 or 8. Refer to the DIG_Trigger_Config function for an explanation of the

pattern match trigger mode.

If you are using a Lab or 1200 Series device in pretrigger mode, NI-DAQ does not send any

messages you configure for the end of the acquisition. These devices do not generate an

interrupt at the end of the acquisition when in pretrigger mode.

DAQEvent=9—NI-DAQ sends a message when a transition (low to high or high to low)

appears on a counter output or external timing signal I/O pin. Table2-17 shows the possible

counters and external timing signals that are valid for each supported device.

If you are using one of the counters on the PC-TIO-10 for your timing signal, you must

connect the counter output to the EXTIRQ pin either externally through the I/O connector or

with the two jumpers on the device. The jumpers connect the OUT2 and OUT7 pins with the

EXTIRQ1 and EXTIRQ2 pins, respectively. NI-DAQ returns an error if you specify a counter

that is in use. Use EXT1 for the chanStr parameter regardless of which EXTIRQ pin you are

Digital

pattern

matched

8Send a message when data from

any digital port in chanStr

causes this statement to be true:

data AND DAQTrigVal0

EQUAL DAQTrigVal1. Only

the lower word is relevant

Lab and 1200 Series devices (except

an SCXI-1200 with Remote SCXI)

<DIO>

DIO 6533 devices <DIO>

PC-DIO-24/PnP, DAQCard-DIO-24,

PC-DIO-96/PnP, PCI-DIO-96,

DAQPad-6507/6508 <DIO>

AT-MIO-16D, AT-MIO-16DE-10

<DIO>

Counter

pulse event 9Send a message each time a

pulse occurs in a timing signal.

You can configure only one

such event message at a time on

a device, except on the

PC-TIO-10, which can have

two.

Am9513-based MIO devices <TIO>

PC-TIO-10 <TIO>

Table 2-17. DAQEvent Messages (Continued)

DAQEvent

Type Code Description

of Message Usable Devices