I had to get some diagnostic information from a Coherent laser. It's super easy if you connect via USB on an Ubuntu machine.
First, install minicom:
sudo apt install minicom
Now you need to find the name of the device. Run
dmesg | grep tty
The output will look something like this:
$ dmesg | grep tty [ 0.000000] console [tty0] enabled [26890.843225] usb 1-2: FTDI USB Serial Device converter now attached to ttyUSB0
Unplug the USB and plug it back in again, and rerun
dmesg | grep tty
You'll see additional messages about something getting disconnected and attached, similar to this:
$ dmesg | grep tty [ 0.000000] console [tty0] enabled [26890.843225] usb 1-2: FTDI USB Serial Device converter now attached to ttyUSB0 [27005.835517] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 [27057.953214] usb 1-2: FTDI USB Serial Device converter now attached to ttyUSB0
In this example, the device name is
ttyUSB0. Now run
sudo minicom -s
and select “Serial port setup”. Type A (no enter key, it will automatically move your cursor) and change the serial device to
or whatever your device name is. It will have
/dev/ in front of it no matter what.
Now type E to set up the other parameters. Type B to lower the speed (or A to raise it) to 19200. It says the current speed at the top. Type Q to set the parity and stop bits. When you're done, it should say at the top:
Current: 19200 8N1
If it does, press enter. Now choose Exit (not Exit from Minicom). You'll be taken to a terminal where you're now connected. You can start issuing commands, which all start with a question mark. Try:
It should return some sort of number or something. The rest of the commands should be saved here, or you can ask Coherent for them.