Serial (Player Only) Connection Parameters for Zebra ZTC ZD421-203dpi ZDL

I have been having intermittent success with printing to this model, I think due to a variety of causes but want to be sure I am using the optimal/correct values for Baud Rate, Message Delimiter, and Message Terminator.

What works for others?

Baud rate, term, and delim are all determined by the device being used, and is most often whatever default is listed in their manual

Couple reference docs/links from zebra here that may be helpful:
Zebra Customer Community