Reference Guide

ZCOM C I/F Library Routines
ZCONFIG (3X)
Chapter 4218
The error or status message text may be fetched using zcomstatus (3X) with
req = ZCOM_MRQCODE_PORT (or 14) and the return status. Note that
status codes PT_BAD_BAUD, PT_ILL_SCLK, PT_ILL_PMODE, and
PT_BAD_PORT imply the associated port is now inoperative. Another port
configuration request must be performed to recover it.