Picaxe 08M question

I think I know the answer to this but I would appreciate confirmation. I plan on programming the chip off-line to free up space on the PCB. Should Pin 2 (ser in) be grounded?

Yes, the SerialIn pin must be pulled low when not downloading a program.
Using a resistor enables the pin to also be use as a digital input after the DISCONNECT command is performed.

If the SerialIn pin is left floating then whenever the logic state is seen to go high, the PICAXE starts waiting for a program to commence downloading and as a minimum will cause the already installed program to reset.

Thanks! Just as I thought.