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First, print the current setup :

LD 22

REQ prt
TYPE cfn

The port you are looking for should look something like this :

ADAN TTY 1
TTY_TYPE SDI
CAB 00
CARD 00
PORT 1
DES
BPS 9600
BITL 8
STOP 1
PARY none
FLOW no
USER TRF SCH
TTYLOG 0
BANR yes

Now, go to LD 17 :

LD 17

REQ chg
TYPE adan
ADAN chg tty 1

The USER prompt is where you define what this port should do. To eliminate one of the options, use an X :

USER xtrf

Doing this, the user prompt from the previous example will look like this in LD22 :

USER SCH