Programming instructions

Chapter 14 SCXI Hardware
DAQ Hardware Overview Guide 14-8 www.ni.com
The SCXI-1300 and SCXI-1303 terminal blocks that you can use with the
SCXI-1100 module each have an onboard temperature sensor that is
jumper configurable to be either multiplexed with the other input channels
(MTEMP configuration), or to be sent directly to a different DAQ device
channel (DTEMP configuration). In the MTEMP configuration, you can
select the temperature sensor in software using the
SCXI_Single_Chan_Setup function. If you use the DTEMP
configuration, the temperature sensor output appears on DAQ device
channel 1. When you use the SCXI-1300, multiply the voltage you
read from the temperature sensor by 100 to get degrees Celsius. The
SCXI-1303 temperature sensor is a thermistor; you can use the thermistor
conversion routine described in Chapter 5, Transducer Conversion
Functions in the NI-DAQ User Manual for PC Compatibles to convert the
thermistor voltage to temperature.
Please refer to the SCXI-1100 User Manual for more information on the
hardware-selectable signal conditioning features on the module.
The SCXI-1100 supports the multiplexed operating mode only; it does not
support parallel mode.
SCXI-1101
The SCXI-1101 has 32 differential analog input channels and one
cold-junction sensor channel (CJTEMP) that is selectable through the
SCXI_Single_Chan_Setup function. When you use this module with an
SCXI-1300, SCXI-1303, or SCXI-1311 terminal block, the terminal block
temperature sensor connects to CJTEMP; the sensor on the SCXI-1311 has
a voltage range of 200 to 24 mV at 0 to 50 °C and on the other terminal
blocks, a range of 1.91 to 0.58 V at 0 to 50 °C. The module can multiplex
CJTEMP with the other 32 input channels during a hardware-controlled
scan. All channels have a fixed gain of 1. You can scan channels on the
SCXI-1101 in any order, except for the CJTEMP channel that has to be the
first channel in a scan.
The SCXI-1101 supports the multiplexed operating mode only; it does not
support parallel mode.
SCXI-1102, SCXI-1102B, and SCXI-1102C
The SCXI-1102 has 32 differential analog input channels and one
cold-junction sensor channel (CJTEMP) that is selectable through the
SCXI_Single_Chan_Setup function. When you use the module with an
SCXI-1300 or SCXI-1303 terminal block, the terminal block temperature
sensor connects to CJTEMP. The module can multiplex CJTEMP with the