User's Manual

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Configuring Digital I/O
IDentity 5200 User Guide 61
Digital Input Alarm Generation
The IDentity 5200 can be configured to generate an alarm when a digital
input is disconnected or sensor failure is detected. The alarm is triggered
when the signal level on the digital input stays in the specified state longer
than the specified alarm timeout. This behavior can be configured
independently for each digital input.
The configuration variable
dio.in.alarm.logic_level.<N> (where <N> is
1,2,3,4) sets whether the alarm is coupled to a input logic level of 0 (low) or
1 (high).
The configuration variable
dio.in.alarm.timeout.<N> (where <N> is 1,2,3,4)
sets the amount of time, in seconds, to wait for a signal state change. A
value of 0 (default) disables alarm generation.
The digital input logic level is used along with the corresponding digital input
pin timeout value to determine if an alarm (in the form of an event) should
be generated. If a timeout value is set, the input pin is monitored. If the
input pin value does not change during the timeout period AND the input
pin value matches the alarm logic level, the event
event.dio.in.alarm.timeout.n (where n is the pin number) is generated. This
alarm event generation can be helpful in alerting to the loss of digital inputs
to the reader.