By default, Avanti presents two serial ports under OpenVMS, OPA0 and TTA0.  Procedures that check for serial devices by scanning for a TX device will need to be updated to reflect the ports presented by Avanti.

Example of obtaining the terminal device name:

$ TERM = F$GETDVI("SYS$INPUT","DEVNAM")
$ SH SYM TERM
 T = "_TTA0:"

This DCL example is retained as historical operational guidance and was not independently executed during the 5.1.0 documentation review. Run it in the intended terminal session and verify the reported device name rather than assuming that every session returns TTA0.

Note: TX serial devices can be added using the Digiboard serial card.  See 5-Port Serial Card Support (OpenVMS).