Reference Guide

ZCOM C I/F Library Routines
ZPORT (3X)
Chapter 4 285
When zport returns a zero error code, the return status stat indicates the
completion status: zero means successful, while non-zero values indicate
the reason for the problem. Note that status code 4, 5, 6, and 7 implies
the associated port will now be inoperative. Another zport configuration
request must be done to recover it.