User`s guide

178 DC 900-1340I
BSC Programmer’s Guide
option is set to disable (the default setting), incoming data blocks are routed to the
Manager session for that link. If the option is set to enable, and the Read session for a
given link is non-existent, incoming data blocks are NAK’d, and any buffers currently
queued for the Read session are dequeued and discarded. When a Read session is
resumed on that link, incoming data is sent to the Read session as is done normally.
To set this option using the DLI configuration file, use the readSession parameter; for
example,
readSession = “no”. See Table 7–2 on page 191.
6.22 Alternating ACK Control Option (24)
The alternating ACK control option defines whether the BSC 2780/3780 software
acknowledges BSC data blocks by alternating response codes (ACK0 and ACK1) or by
sending a single ACK character.
To set this option using the DLI configuration file, use the altAck parameter; for exam-
ple,
altAck = “yes”. See Table 7–2 on page 191.
6.23 Line Turnaround Delay Option (25)
This option controls the delay that BSC waits to bid after it receives a line turnaround
(EOT) from the remote computer. This option is useful when communicating with
older computers that need more time to switch to receive mode. Delay time is specified
in tenths of seconds and can range from zero (no delay) to 8192 (819.2 seconds).
To set this option using the DLI configuration file, use the lineTurnDelay parameter; for
example,
lineTurnDelay = 0. See Table 7–2 on page 191.
6.24 TTD/WACK Option (26)
The TTD/WACK option controls whether or not the BSC 2780/3780 software transmits
temporary text delay (TTD) and wait acknowledge (WACK) sequences when appropri-
ate.