3M Traffic Safety Systems 6204 Benutzerhandbuch

1 2 3 4 5 6 7

Configuring Digital I/Os

3M Toll RFID Reader 6204

3M Toll RFID Reader 6204 User’s Guide

User’s Guide

8.5.

Digi

Digital Input Alarm Generation

tal Input Alarm Generation

The 6204 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_leve

.<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.