A basic tool for testing your serial port connection on your Mac isCoolTerm by Roger Meier:

You can download CoolTerm here (mirror).

To use the programmer in Mac OS X, you will need to determine which names have been assigned to its serial ports. To do this, open a Terminal window, type ls /dev/tty.usb., and press enter. You should see two entries of the form tty.usbmodem (e.g. I tried to use the built-in port listing function but got different results depending on the python version. I'm using Mac OS X 10.11. Python 2.7.5.

Step 1 - Start CoolTerm¶

CoolTerm is idle state when you open it. First you need to select andconfigure the serial port by pressing the options button.

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Step 2 - Configure and select the Serial Port¶

Configure the serial port and select the serial port. If CoolTermdoesn’t show your serial port, you need to press the Re-Scan SerialPorts button. The serial port should show up in the selection list, ifit doesn’t show, please check if the driver has been installed correctly (see support).

Press the ok button when you’re finished.

Step 3 - Use the Serial Port¶

CoolTerm is still Idle, press the Connect button to open the serialport. After pressing this button the character your type are send to theouter-space via the serial port, and characters it receives aredisplayed in the window. You can also monitor the handshake signals viathe signal LEDS in the right corner, and you can control the RTS and DTRsignal by pressing the signal LEDS