Reference Guide

ZCOM C I/F Library Routines
ZCNTL (3X)
Chapter 4172
Modes 5 and 7 are only meaningful when rcode is 3.
Some bits (when set) in the mode parameter can cause zcntl to behave
differently. Refer to the NOTES section in zsend(3X) for details.
rcode Control request code:
ZCOM_MRQCODE_CNTWR
ZCOM_MRQCODE_TERM
ZCOM_MRQCODE_ENB
ZCOM_MRQCODE_DSB
ZCOM_MRQCODE_ACT
ZCOM_MRQCODE_DEA
(3) - Control write (length in len)
(6) - Set terminal parameters
(7) - Enable terminal
(8) - Disable terminal
(9) - Activate polling
(10) - Deactivate pollin
To operate normally, a terminal ZLU must be enabled
(rcode=ZCOM_MRQCODE_ENB) and activated
(rcode=ZCOM_MRQCODE_ACT). If the terminal ZLU is deactivated
(rcode=ZCOM_MRQCODE_DEA), the ZCOM subsystem cannot receive
incoming messages from that terminal (used for flow-control). If it is
disabled (rcode=ZCOM_MRQCODE_DSB), data messages can neither be
sent nor received from the terminal.
Request ZCOM_MRQCODE_TERM is used to configure a terminal with
new parameters, which are protocol dependent. Control write request
ZCOM_MRQCODE_CNTWR provides a means of passing protocol
specific control information to a terminal. These two requests require
setting up the ibuf and len parameters.
mhp Pointer to message header. It contains some data fields to be sent with
the data message. See the NOTES section in zsend(3X) for what fields
must be set up by the caller. If NULL is specified, default values are used.
For its structure, refer to the subsection on ‘Message Header’ in the
Multi-protocol ACC Programmers’ Reference Guide.