I’m replying almost a year after this was first asked because I ran into the same problem.
Here is the solution.
The Micro Maestros ship with SERIAL_MODE_UART_DETECT_BAUD_RATE as the default.
This seems to enumerate as a CDC device, but the Maestro is not listening to USB in its default mode.
Using “Maestro Control Center” while running Windows is somewhat inconvenient for Linux and OS-X, but that is the easiest way to change the default serial mode setting.
Once SERIAL_MODE_USB_DUAL_PORT is set as the serial mode,
the Maestro will listen to commands over USB.
I also use pyserial. Here is a code fragment:
import serial
s=serial.Serial()
# lower port # is command port
s.port="/dev/tty.usbmodem00022961"
s.baudrate=115200
s.timeout=1
s.open()
def setpos(pos):
"""pos is 0.25us increments centered about 1500us +/- 500us
so range is 4000..8000
"""
low=pos&0x7f
high=pos>>7
#print low,high
# cmd, chan, low, high
s.write(chr(0x84)+chr(0x00)+chr(low)+chr(high))
It is also possible to use libusb via pyusb after unloading the USB CDC driver.
Read the man page for kextunload.
There are separate drivers for Control, Data, and the base class.
Here is a pyusb code fragment to set the serial mode to “USB Dual Port”:
device.ctrl_transfer(0x40, 0x82, 0, ((1<<8)+3))
Use kextload to reload the CDC drivers to use pyserial.