Different Data Bits sizes than 7 or 8

Is it possible to have less than 7 or 8 data bit sizes? I'm analyzing a protocol that has 6 data bits, but I can't set the software that low. I'm using the IO Ninja Serial Tap.

Yes, it's possible; please open <ioninja-root-dir>/scripts/common/ui_SerialUi.jnc in any text editor, find the definition of m_dataBitsTable, and add the desired data bits options:

// ...
static EnumPropertyOption const m_dataBitsTable[] = {
	{ "5 bits", 5 },
	{ "6 bits", 6 },
	{ "7 bits", 7 },
	{ "8 bits", 8 },
}
// ...

This change will apply to Serial Tap and all other serial-related plugins.