Справочник Пользователя для National Instruments NI PCI-6111
Chapter 3
Hardware Overview
3-8
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The analog trigger circuit generates an internal digital trigger based on the
AI signal and user-defined trigger levels. This digital trigger can be used by
any DAQ-STC timing section, including the AI, AO, and general-purpose
counter/timer sections. For example, the AI section can be configured to
acquire n scans after the AI signal crosses a specific threshold. As another
example, the AO section can be configured to update its outputs whenever
the AI signal crosses a specific threshold.
AI signal and user-defined trigger levels. This digital trigger can be used by
any DAQ-STC timing section, including the AI, AO, and general-purpose
counter/timer sections. For example, the AI section can be configured to
acquire n scans after the AI signal crosses a specific threshold. As another
example, the AO section can be configured to update its outputs whenever
the AI signal crosses a specific threshold.
Digital I/O
The NI PCI-6110/6111 contains eight lines of DIO for general-purpose use.
You can individually software-configure each line for either input or
output. At system startup and reset, the DIO ports are all high-impedance.
You can individually software-configure each line for either input or
output. At system startup and reset, the DIO ports are all high-impedance.
The hardware up/down control for general-purpose counters 0 and 1 are
connected onboard to DIO6 and DIO7, respectively. Thus, you can use
DIO6 and DIO7 to control those counters. The up/down control signals,
GPCTR0_UP_DOWN and GPCTR1_UP_DOWN, are input only and do
not affect the operation of the DIO lines.
connected onboard to DIO6 and DIO7, respectively. Thus, you can use
DIO6 and DIO7 to control those counters. The up/down control signals,
GPCTR0_UP_DOWN and GPCTR1_UP_DOWN, are input only and do
not affect the operation of the DIO lines.
Timing Signal Routing
The DAQ-STC provides a flexible interface for connecting timing signals
to other devices or external circuitry. The NI PCI-6110/6111 uses the
RTSI bus to connect timing signals between devices and the Programmable
Function Input (PFI) pins on the I/O connector to external circuitry. These
connections enable the NI PCI-6110/6111 to both control and be controlled
by other devices and circuits.
to other devices or external circuitry. The NI PCI-6110/6111 uses the
RTSI bus to connect timing signals between devices and the Programmable
Function Input (PFI) pins on the I/O connector to external circuitry. These
connections enable the NI PCI-6110/6111 to both control and be controlled
by other devices and circuits.
You can control 13 timing signals internal to the DAQ-STC with an external
source. These timing signals can also be controlled by signals generated
internally to the DAQ-STC, and these selections are fully software
configurable. For example, the signal routing multiplexer for controlling
the STARTSCAN signal is shown in Figure 3-10.
source. These timing signals can also be controlled by signals generated
internally to the DAQ-STC, and these selections are fully software
configurable. For example, the signal routing multiplexer for controlling
the STARTSCAN signal is shown in Figure 3-10.