[Elecraft] K3 - N1MM and RTTY - DATA/DATA A OR USB mode ?????

[Jim Miller KG0KP]

newbee questions (dumb).  

N1MM shows PSK mode on top of the logging window when the K3 is in Data A mode but seems to transmit RTTY OK.  Does it matter or am I supposed to be using USB mode.  I prefer to use the Data modes when possible.

Contest starts in an hourand a half.  Nothing like discovering this stuff at this late time but better than after it starts.

THANKS es 73, de Jim KG0KP