HP UX 11i v1 I/O Cards manual Mhp, ACC Programmers’ Reference Guide Ibuf, len, Rstat, ReturnParam

ZCOM C I/F Library Routines

ZCNTL (3X)

rcode	Control request code:
	ZCOM_MRQCODE_CNTWR	(3) - Control write (length in len)
	ZCOM_MRQCODE_TERM	(6) - Set terminal parameters
	ZCOM_MRQCODE_ENB	(7) - Enable terminal
	ZCOM_MRQCODE_DSB	(8) - Disable terminal
	ZCOM_MRQCODE_ACT	(9) - Activate polling
	ZCOM_MRQCODE_DEA	(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 .
ibuf, len	If rcode=ZCOM_MRQCODE_CNTWR, ibuf contains the control data for the
	protocol, and len indicates the length of the control data. If
	rcode=ZCOM_MRQCODE_TERM, ibuf contains the configuration data for the
	terminal as described below, and the len indicates the total length of the
	configuration data. For other values of rcode, ibuf and len are not used.
rstat	Return status. Only used for requests issued with ‘wait’, i.e. mode =
(ReturnParam)	ZMODE_WAIT. NULL may be used if the return status is not required.

162 Chapter 4