Figure out the RS-232 connection setting of the target device, especially the baud rate settings first. Set up the target device, UC232A, power on the target device and your Mac.
Open a terminal window and type "screen /dev/tty.UC-232AC 19200 8N1" without the parenthesis. In this command, "19200 8N1" implies the baud settings. Please change it accordingly. For details, please find the below video.
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