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
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
Table | Logical Terminal Table (Reserved Area) |
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Field Name | Field Description | Field | Size | |
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LTZLU | Owning terminal ZLU number | uns.short | 2 | |
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LTZCS | Owning terminal ZLU checksum | uns.short | 2 | |
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LTMUX | MUX i/f number for this terminal | uns.short | 2 | |
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LTPORT | Port number within Mux interface | uns.char | 1 | |
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LTTERM | Terminal number within port | uns.char | 1 | |
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LTPTERM | Pointer to physical terminal table | pointer | 8 | |
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LTGZLK | ZLU of next terminal in group | uns.short | 2 | |
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LTDEVC | Device type of terminal | uns.short | 2 | |
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LTTYPE | Logical type of terminal | uns.short | 2 | |
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LTFLAG | System status flags | uns.short | 2 | |
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62 | Chapter 3 |