ACC Utilities Reference Guide

TTGEN - ZCOM System Table Generator
Creating the TTGEN Configuration File
Chapter 240
<offset> the offset of the reserved space within the spare data
area. This field starts from 0 up to (Logical-Size - 1), in
multiples of 8.
<size> the number of bytes, in multiples of 8, to be reserved
Queue-Limit
The default maximum number of messages that can be queued on a
program ZLU if the limit is not specified in the zopen call. This
parameter is used to prevent defects in applications that use the ZCOM
API from consuming all of the available memory in the buffer pool.
Specifically, for ZCOM applications that fail to read messages from their
program ZLU queue. The valid range of values is 1…2147483647
(0x7FFFFFF, ZCOM_MAXQLIM). It defaults to 2147483647
(ZCOM_MAXQLIM).
Transmit-Limit
The maximum number of transmit messages for each physical terminal
table (terminal ZLU). This parameter is used to prevent poorly designed
ZCOM application programs from consuming all of memory in the buffer
pool when sending data to a terminal ZLU. (The valid range of values is
1…2147483647 (0x7FFFFFF, ZCOM_MAXQLIM). Defaults to
2147483647 (ZCOM_MAXQLIM). Note that when this number of
messages is reached on a terminal transmit queue and another zsend is
attempted, ZCOM returns error code ZELIMIT (-51).
Unack-Limit
The maximum number of bytes in the unacknowledged queue for each
terminal. The data on this queue is also resident in the buffers on the
interface card, where buffer space is limited. This parameter avoids
swamping the transmit buffers on the interface card with data for only a
few (or perhaps one) terminals. That is, this parameter is used to insure
that each terminal ZLU gets its fair share of the link transmit
bandwidth. The valid range of values is 1…2147483647 (0x7FFFFFF,
ZCOM_MAXQLIM). Defaults to 2147483647 (ZCOM_MAXQLIM). The
recommended value is 5,000 bytes or less.