Outputting a Constant Signal From a Serial Port ( RCM6700 Mini Core)

What do you mean by a “constant signal”?

If you want to output a constant 1 or 0, why aren’t you just using a digital output?

Thank you, for your answer, trooper2. My final goal is to connect CRM to switch. There will be few final numbers ( 00001, 00010, 00011 etc.), that I need to continuously output on a pinout and to change between them, from time to time.
Is digital output fits for purpose?