Digital Input Characteristics

The AL-1032 supports a variety of ways to configure a system that can measure the state of a digital source from a device under test. The following sections outline what sources are available and how to configre the module to support the desired configuration.

	Supported
Module DI
Ch 1..32	Yes
External DI
Ch 1..32	Yes

Input latency	~50 ns
Pull up/down configuration	None by default. See External Bus Characteristics for more details.
Acquisition details
Acquisition Type	Single-Point
Timing Type	On Demand
Update Rate [2]	Determined by system configuration and the NI-SLSC driver
Threshold characteristics
Threshold range	0 V - 60 V
Threshold step size	~2.93 mV/div
PWM input characteristics
Period step size	20 ns
Maximum period duration	~5.36 seconds
Active time step size	20 ns

[2]

The application update rate does not affect the accuracy of the device, only how often the values are available.

SLSC Configuration Properties

Name	Resource Type	DataType	Description	Valid Values
AL.DIR_Bank<n>	Device	Bool	XJ2: XIO CH<n> direction	True (Output) to send to external on RTI, False (Input) to read from external on RTI
AL.RTI_Mode	Physical Channel	Enum	RTI DIO routing mode	RTI DI: (0, DIN_to_RTI), RTI DO: (1, Register_Mode)
AL.THRESHOLD	Physical Channel	Double	Threshold value for comparisons	[0.0..60.0]

SLSC Interface Properties

Name	Resource Type	DataType	Description	Valid Values
Discrete
AL.DI	Physical Channel	Bool	Current state of the digital input	True, False
PWM
AL.PWM_In_Period	Physical Channel	UInt32	Counted period time for DIN1 PWM input. The period time is counted in multiples of 20 ns.	[..]
AL.PWM_In_DutyCycle	Physical Channel	UInt32	Counted active time for DIN1 PWM input. The active time is counted in multiples of 20 ns.	[..]