CTI Products IIB Console Interface - Manual (Page 22)

IIB Hardware Reference Special Features
CTI Products, Inc.
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7. Special Features
7.1 Link Failure Reporting
The IIB has a selectable option to show communication link failures between the
IIB and its Comparator I/O Module (network link failures) or between the
Comparator I/O Module and the comparator (comparator link failures). With this
option enabled, the IIB will always report network link failures. Comparator link
failures will only be reported if the Comparator I/O Module implements Link
Failure Reporting. Refer to the hardware reference manual of the Comparator I/O
Module being used to see if it supports this feature (for example, Link Failure
Reporting is supported in the AIB module, but not in the CIB module).
This option is enabled by grounding connector J1 pin 4, the Link Fail Enable
input, and then resetting the IIB. When this input is grounded, the IIB no longer
provides monitor and control of its receiver 8 I/O lines (J1 pins 26, 27, 28 and 30).
Instead, the Link Fail output (connector J1 pin 30) is used to show the status of
communication links. If this output is HIGH, all communications are OK between
the IIB and its Comparator I/O Module and between the Comparator I/O Module
and the comparator. If either of these communication links break (a cable is
disconnected or a module is turned off), then this output will be driven LOW by
the IIB to indicate the link failure.