Texas Instruments 990 User Manual page 63

~-------
~
946289-9701
The Send Request must not contain any blanks. All of t.he fields shown in the format must be
included and the fields must be separated with asterisks as in the preceding format. The terminating
asterisk is not required.
,
The transparency and end of media (2780), or compression/expansion (3780) designations in the
Send Request, do not need to consider the condition of these options at the receiving terminal. The
Send Request options have no effect on the options at the receiving terminal. The Send Request
transaction is transparent to the receiving station except for the logging of messages associated with
the transaction and the presence of the Sor SS command in the station's transmit queue. The record
length specified in the Send Request should consider the maximum input/ output buff er size of the
receiving terminal to avoid truncation of records.
When a synonym is used as the Send Request pathname, the synonym must be defined at the
receiving station.
The receiving station will not recognize the Send Request recognition code unless the Send Request
feature is enabled at the receiving station. The Send Request feature is enabled using the Send
Request (SRQ) command described in paragraph 4.3.1.11, or it may be enabled as the default value
during installation. If the feature is not enabled and the station receives a Send Request, the station
treats it as data.
4.5.4 RECEIVE COMMANDS. The receive commands specify the pathnames for received data
designated for the printer or punch.
The receive
cm.~mands
are entered on a receive queue as they are executed. The receive queue uses
the following priority format:
I st normal pathname entry
(n)th normal pathname entry
I st $-option entry
(n)th $-option entry
default entry
Ea.ch new entry for the receive queue is placed on the queue following all entries of equal or higher
priority (lower numerical value) and ahead of all entries of lower priority. For example, a normal
pathname entry would be placed on the queue following any entries of the normal variety already on
the queue but ahead of any entries of the $-option variety. A $-option entry would be placed on the
queue following any normal entries and any $-option entries but ahead of the default entry.
Entries on the queue are accessed in the order of their appearance on the queue. The Emulator looks
at the top of the queue to get the next destination for received data. Normal entries arc dequeued as
they are accessed; $-option entries are dequeued when the S value exceeds 99 or when an error occurs
during an attempt to open the specified pathname. The default entrris never dequeued.
When an open-pathname error is encountered, out!,,Ut proceeds to the next lower priority entry
(higher numerical value) on the receive print queue If there are no more entries on the queue, an
error is reponed to the host system.
Digital Systems Group