Build the new TTY port off a MGC, add cty to the USR prompt, assuming you have a CS1000E with MGC cards. If not, build a TTY with CTY in the USR field.
ld 17
CHG
ADAN
NEW TTY x (enter the number of the TTY)
CTYP MGC
IPMG X X (put in the number of the MGC that the TTY is on, such as 0 0, 0 1, etc)
DNUM X (put in the device number)
PORT 1 (if using port 1 off the MGC cable)
DES CDR
BPS 9600
BITL 8
STOP 1
PARY NONE
FLOW NO
USER CTY