open drain output as digital output?

[mister_e]

Will a port pin that is an "open drain output" support a SEROUT command?

Yes for sure, use Dave's suggestion.

The pin in question RA4 is multiplexed with a Timer0 module clock input. Can it still be used as a digital pin?

Yes

Will a SEROUT command set the pin digital output even if the pin was previously set as analog input?

Nope, this is also why we see many question about that. Always make sure you disable multiplexed stuff(when possible) on an i/o before using it.

ADCs/analog comparator are popular.

[droptail]

I have success with 1k hold up for now.
I also have no problems for years with SEROUT command working on a port pin set as analog and input, why?

TRISA =255 'all PortA Inputs
ADCON1 =0 'all PortA Analog

SerOut PORTA.0,N2400 ...

[droptail]

Thank you both for your help.

[mister_e]

Probably at slow baudrate it may work... but i will never trust or use that.