I'm also trying to use only my MacOS machine like you did, but I have some issues.
So here is what I've done so far.
I've installed the driver and so I've been able to find the device like this
Then I've flashed the Arduino with the hex from here: http://forum.eleksmaker.com/topic/87/software-for-mac
By doing this
avrdude -carduino -b57600 -patmega328p -P/dev/tty.wchusbserial14310 -Uflash:w:ManaSE_v3.7.hex:i
Unfortunately I've noticed some error of verifications. I don't know if it means it didn't work
avrdude: verifying ... avrdude: verification error, first mismatch at byte 0x7f00 0xff != 0x09 avrdude: verification error; content mismatch avrdude: safemode: Fuses OK (E:00, H:00, L:00) avrdude done. Thank you.
Then launch minicom in one terminal
minicom -D /dev/tty.wchusbserial14310
Then send this g-code commands from another terminal
# This one should select "Draw mode" echo "E2" >> /dev/tty.wchusbserial14310 # This one should select "servo mode" echo "A0" >> /dev/tty.wchusbserial14310 # Then I tried some simple command but nothing works echo "G1 X10 Y0" >> /dev/tty.wchusbserial14310
Could you help me understand what I'm doing wrong?
Thanks in advance