HP UX 11i v1 I/O Cards manual Logical Terminal Tables

ZCOM Tables and Data Structures

Logical Terminal Tables

Logical Terminal Tables

The Logical Terminal Table (LTT) pages contain the logical configuration information for each terminal ZLU in the ZCOM system. Each terminal table consists of the basic table (which is fixed for all terminals) and a table extension (which is of configurable size specified by LOGICAL-SIZEparameter in the TTGEN configuration file).

The basic table contains common information for all terminal ZLUs. It is logically divided into two sections; an area reserved for use by the ZCOM subsystem and a user area that may be manipulated by application programs (via the zltup routine).

The table extension may be used to store any application defined data structure and can be manipulated by the application program that allocates it (via the zltstore routine).

The layout of a Logical Terminal Table (zltt_type) basic table is shown in Table 3-9 and Table 3-10. Note that the section reserved for use by the ZCOM system is immediately followed by the user area.

Table 3-9	Logical Terminal Table (Reserved Area)
Field Name	Field Description	Field Type	Size
			(Bytes)
LTZLU	Owning terminal ZLU number	uns.short	2
LTZCS	Owning terminal ZLU checksum	uns.short	2
LTMUX	MUX i/f number for this terminal	uns.short	2
LTPORT	Port number within Mux interface	uns.char	1
LTTERM	Terminal number within port	uns.char	1
LTPTERM	Pointer to physical terminal table	pointer	8
LTGZLK	ZLU of next terminal in group	uns.short	2
LTDEVC	Device type of terminal	uns.short	2
LTTYPE	Logical type of terminal	uns.short	2
LTFLAG	System status flags	uns.short	2
LTZMXP	ZCOM address of multiplexing program	struct	6
LTZPRCVR	ZCOM addr. of indirect primary receiver	struct	6
SPARE1	Reserved, not used	int	4

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