Wiring ASMC-04B Servo With Raspberry Pi
Using the S (signal) pin and GND pin on the ASMC-04B I was able to control the stepper with a DAQC plate and a Raspberry pi. The DAQC plate can probably be replaced with a normal GPIO pin however I find the signal output when other things are running on the Pi is more reliable on the DAQC than the normal GPIO pin. Here is the code:
while True:
    DAQC.setDOUTbit(0, 0)
    time.sleep(0.001)
    DAQC.clrDOUTbit(0, 0)
    time.sleep(0.001)

time.sleep(0.001) moves the motor clockwise where 0.000001 moves the motor the other direction. My DAQC plate is set to address 0 and the pin is also 0. One again you can probably use RPi.GPIO to control it but this works for me!