VTI Instruments EX1629, Руководство пользователя

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VTI Instruments Corp.
92 EX1629 Programming
S
TARTING
/S
TOPPING
A
CQUISITION
Acquisition is started by using the vtex1629_trig_init function, which initializes the trigger
subsystem. This causes the trigger state machine to transition from the IDLE state to the Waiting
for ARM state (see Figure 4-1). Depending on the configuration of the Arm and Trigger sources,
data acquisition may begin immediately – if both Arm and Trigger are configured for Immediate
(VTEX1629_TRIG_SRC_IMMEDIATE) –, or at some point in the future when the instrument
receives the required signals (e.g., a raising edge on LXI 0). In general, after acquisition is
initiated by the vtex1629_trig_init function, it will continue until the requested number of samples
has been acquired, possibly several times, depending on the configuration of the Arm and Trigger
Count variables, and the value of Continuous Init.
status = vtex1629_trig_init( vi );
The acquisition may be halted at any time by using the vtex1629_abort function. This causes
acquisition to stop, and the trigger state machine transitions to the IDLE state (see Figure 4-1).
status = vtex1629_abort( vi );