A Data AcQuisition (DAQ, PCL-812PG) card is used as a hardware interface. Basically it interfaces between the signal and a PC. The pulses send from the PC goes to the driver circuit through daughter board connected to DAQ card. There are 16 input (higher 8 pins and lower 8 pins)  and 16 output pins in the daughter board. In this case we used first 4 output pins of  daughter board for controlling stepper motor.

Switch to super user

 $ sudo su

For RT-Linux (real time linux), Download the zip file and extract that              Click here from downloading the code

Enable RT-Linux mode

# rtlinux start

Compile the code

# make -f rtl.mk steppermotor.o

Execute or run the thread

# insmod steppermotor.o

The code will be execute and signal will be sent to daughter board’s pin
Now stop the thread, now type following command in terminal

# rmmod stepper motor

Disable or stop RT-Linux mode

# rtlinux stop

For Linux, please download  the code and extract that …                                      Click here for downloading the code
Compile and run the code

# gcc -O stepperMotor.c -o stepperMotor
# ./stepperMotor 

the code will execute and you will get your desire output at daughter board’s pin