Add counter output channel
ch = addCounterOutputChannel(s,deviceID,channelID,measurementType)
[ch,idx] = addCounterOutputChannel(s,deviceID,channelID,measurementType)
adds a counter channel on the device represented by
channelID, and channel measurement type,
measurementType, to the session
s. Measurement types are vendor specific.
daq.createSession to create a
session object before you use this method.
s = daq.createSession('ni'); ch = addCounterOutputChannel(s,'cDAQ1Mod3','ctr0','PulseGeneration'); ch.Terminal % View device signal name for pin mapping.
s = daq.createSession('ni') ch = addCounterOutputChannel(s,'cDAQ1Mod3',0:1,'PulseGeneration')
s— Data acquisition session
Data acquisition session, specified as a session object. Create the
session object using
daq.createSession. Use the data
acquisition session for acquisition and generation operations. Create one
session per vendor and use that vendor session to perform all data
deviceID— Device ID
Device ID as defined by the device vendor specified as a character vector.
Obtain the device ID by calling
daq.getDevices. The channel
specified for this device is created for the session object.
channelID— Channel ID
Channel ID, specified as a numeric value, character vector, or string,
corresponding to the specific counter channel on the device added to the
session. Channel ID
0 corresponds to the device counter
'ctr0', Channel ID
'ctr1', and so on. For the related device signal
names and physical pins, see the pinout for your particular device.
You can add a range of channels by specifying the channel ID with a numeric array, or an array of character vectors or strings.
The index for a channel displayed in the session indicates the channel’s
position in the session. The first channel you add in a session has session
1, and so on.
measurementType— Channel measurement type
Channel measurement type, specified as a character vector or string.
measurementType represents a vendor-defined
measurement type. A valid output measurement type is
ch— Counter output channel object
Counter output channel that you add, returned as an object containing a
n array of vendor specific channel information.
Use this channel object to access device and channel properties.
|Device||Channel device information|
|DutyCycle||Duty cycle of output channel|
|Frequency||Frequency of generated output|
|ID||ID of channel in session|
|IdleState||Default state of counter output channel|
|InitialDelay||Delay until output channel generates pulses|
|MeasurementType||Channel measurement type|
|Name||Specify descriptive name for the channel|
idx— Channel index
Channel index returned as a numeric value. Through the index you can
access the array of the session object's