Reference Guide

ZCOM Tables and Data Structures
Logical Terminal Tables
Chapter 366
LTZSH RC VRS - Pointer to a linked list of indirect shared receivers
This field contains a pointer to a linked list of shared receivers that wish
to receive data messages from an inbound multiplexed terminal. Each
entry in the linked list represents one program. If the
ZCOM_LTFLAG_IMX bit in ltflag is set, the system sets up this field on
a zset_rcvr (mode 0) call. All incoming messages will be received by the
inbound multiplexing program, which will then route the data to each of
the receivers specified in this linked list.
LTHLD Q - Sub-packet holding queue
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.
LTUS ER - User-maintainable area
The fields in the user-maintainable area may be modified by the zltup
call. The area consists of the following fields (up to the end of the
terminal table):
LTA DDR - 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
10-byte field, however the multiplexing program may use these bytes
according to the specific requirements of the protocol.