User manual

Computer Gateway User Manual 4-14 5/96
4.2.3
4.2.3 Link Failure Message
This message is sent by either CG or host processor to indicate failure of one of the links in
a dual-Bisynch pair. It is used as a trigger for switch-over to single-link communication.
Header information: Word 1—Transaction Code = 32
Word 2—Number of Words = 1
Word 5—CG Identifier = 5
Message format: Word 1—not used
Use information: On detection of a failure of its input link, the CG or the host sends
this message on its output link, immediately followed by EOT.
Both processors then revert to single-link communication
(requiring a line bid before each transmission).