User manual

Chapter 3 Software Overview
© National Instruments Corporation 3-107 NI-DAQ User Manual for PC Compatibles
Call RTSI_Clock/RTSI_Conn to connect the signals. Each completed
signal path requires RTSI_Conn calls. The first call specifies the device
signal to transmit onto a RTSI bus trigger line. The second call specifies
the device signal that receives a RTSI bus trigger line. After the signals
are connected, you are ready to do the actual work of your application.
After you finish with the RTSI bus, disconnect the device from the bus.
To do this, call RTSI_DisConn/RTSI_Clock for each connection made.
Alternatively, call RTSI_Clear to sever all connections from your device
to the RTSI bus.
SCXI Functions
Refer to the NI-DAQ Function Reference Online Help file to determine
which functions your device supports.
SCXI_AO_Write
Sets the DAC channel on the
SCXI-1124 module to the specified
voltage or current output value. You
also can use this function to write a
binary value directly to the DAC
channel, or to translate a voltage or
current value to the corresponding
binary value.
SCXI_Cal_Constants
Calculates calibration constants for the
particular channel and range or gain
using measured voltage/binary pairs.
You can use this function with any
SCXI analog input or analog output
module. The constants can be stored
and retrieved from NI-DAQ memory or
the module EEPROM (if your module
has an EEPROM). The driver uses the
calibration constants to scale analog
input data more accurately when you
use the
SCXI_Scale
function and
output data when you use
SCXI_AO_Write
.
SCXI_Calibrate
Provides a single call calibration for the
SCXI-1112, SCXI-1125, SCXI-1520,
and SCXI-1540 modules. With the
SCXI-1112 and SCXI-1125, calling