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ZCOM Tables and Data Structures
Logical Terminal Tables
LTHLDQ -
This queue is a holding queue for partial messages to an inbound multiplexed terminal.
LTDHQN - Data holding queues
For use by an application program to store temporary data for each terminal. Only the queue header is stored in these fields, as the data itself is stored in the ZCOM subsystem buffers.
LTUSER -
The fields in the
LTADDR - Logical terminal address
Holds the logical terminal addressing information needed to recognize the correct logical terminal in a group of multiplexed terminals. This is a
LTSTAT - Logical status
Contains the status of the logical terminal. This entry is maintained by a multiplexing program and will remain unaltered for a normal 1:1 terminal.
Figure | Logical Status Structure LTSTAT |
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| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| EN | AC | UP |
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EN - logical terminal enabled (ZCOM_LTSTAT_ENB)
AC - logical terminal activated (ZCOM_LTSTAT_ACT)
UP - logical terminal up (ZCOM_LTSTAT_UP)
LTCWCT, LTTXCT, LTRXCT, LTERCT - Message and error counters
Allow message counters for control writes, transmit data, receive data, and error events to be maintained by the multiplexing application program, for multiplexed logical terminals.
64 | Chapter 3 |