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As RS-232 come from history of remote communications, the DTE device is expected to connect to a "Data Communications Equipment" (DCE) device (a modem). In the language of RS-232 a computer or end device (Cisco Router for instance) behave as "Data Terminal Equipment" or DTE. Most USB/RS-232 dongles have male DB-9 (or officially DE9) connector, as does most computer equipment. Having got a dongle then you need to ensure you have the right physical plug and the right cabling. ![]() Plugs and Cables - I have dongle but no communications When using the "screen" application remember that the keystrokes "Ctl-a Ctl-\" should get you to the quit prompt and "Ctl-a ?" for help. Which option you choose is likely based on how comfortable you are with the MacOS Terminal and screen programs. My testing was with Intel MacBook Pro and Big Sur 11.2.3 and David Rankin reports that is also works with MacBook Pro M1. Serial port emulator mac install#NOTE #3: As per NOTE #1, the Prolific Dongle now works via the Apple provided driver, so there is no need to install any new Prolific drivers. Serial port emulator mac driver#
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