[Elecraft] K3 with N1MM question

[Randy Moore]

I enjoyed last weekend operating SSCW with my new K3/10 and N1MM.  Both 
were a joy to use!!  I have one curiosity however.  I have the K3 setup 
for semi-QSK with a delay of 0.03 which works fine for me at about 25 
wpm.  However, the keying through N1MM operates as though PTT is enabled 
at the beginning of a transmission and disabled at the end.  In other 
words, I hear no signals during the N1MM transmission.  I'm keying 
through the RS232 port on the K3 from a standard serial port on my PC 
(same cable as used for the CAT from N1MM).  I have PTT--KEY set to 
OFF-dtr, N1MM set for DTR-CW, RTS-Always off.  Is there something I'm 
missing?

73,
Randy, KS4L
K3 #2006
K2 #337