ACC Programmer's Reference Guide

Chapter 3 69
ZCOM Tables and Data Structures
Physical Terminal Tables
PTZPCTL_RCVR - ZCOM address of primary control receiver
This is the node number, ZLU, and checksum used as the destination
address for any control input messages received for this terminal. This
field is set by a zset_rcvr mode 3 call. The control input messages are
distinguished by the protocol modules on the MUX, by setting bit 1 of the
input message tag byte.
PTZSHRCVRS -Pointertoalinkedlistofsharedreceivers
This field contains a pointer to a linked list of programs that wish to
receive normal messages and unsolicited status messages from this
physical terminal. Each entry in the linked list contains the node
number, ZLU, and checksum of the application which will be used as the
destination address for normal messages and unsolicited status
messages received from this physical terminal. This field is set by the
zset_rcvr call (mode 0 or mode 1 if multiplexed terminal). If there are no
shared receivers, this field w ill contain a zero. When a data or s tatus
message arrives, it will be delivered to each application in the linked list
(as well any primary receiver).
PTZSHCTLRCVRS -Pointertoalinkedlistofsharedcontrolreceivers
This field contains a pointer to a linked list of programs that wish to
receive control mess ages from this physical terminal. Each entry in the
linked list contains the node number, ZLU, and checksum used as the
destination address for any control input messages received for this
terminal. This field is set by a zset_rcvr mode 3 call. The control input
messages are distinguished by the protocol modules on the MUX, by
setting bit 1 of the input message tag byte. If there are no shared control
receivers, this field will contain a zero. When a control message arrives,
it will be delivered to each application in the linked list (as well an any
primary control receiver).
PTLIST - Pointer to next PTT on the same port
Contains a pointer to the physical terminal table of the next terminal on
the same Mux interface card and port number as the current t erminal.
These pointers form a circular list o f t erminals on the same port. Field
PTPZLK forms the same circular list, bu t contains the ZLU number.