Ronan X120 - Manual (Page 7)

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Before reporting the occurrence of an “event”, the controller board’s program makes “software filter”
calculation. Recall, that a change in the status of a contact must be seen for a specified duration of time
equal to the “time constant value”) before an event is actually declared. The filter calculations are made to
determine when the proper duration of time has expired. The “time constant value” is set to 16ms for all the
input channels.
3.2 Input Channel Test
The controller board tests all the 48 input channels of the multiplexer for alarm and return to normal
conditions (only if SW2-7 is set to the ON position) each time it is reset. The test error LED would be
illuminated and the horn relay would be made active if any of the 48 input channels failed to test. This test
is done by using two relays K1 and K2. The K1 relay is used to disconnect the field contact power to all the
inputs. The K2 relay is used to test all the input channels by connecting and disconnecting the field contact
voltage to all the channels and checking all the outputs for proper function. The test error flag would be set
on each channel that was bad and they will be reported before the alarm summary (refer to ALARM
SUMMARY section for more information) with the following format:
The BAD channel report is very useful for troubleshooting input boards. By connecting a terminal to RS232 (P1)
port, all the bad channels (if there is any) would be displayed before the alarm summary each time the X120 is
reset.
Note: The input channel test is valid only if all 48 inputs are set for dry contact (B&C jumpers installed).
3.3 Alarm Summary
To update all the annunciator windows with the current status of inputs, Alarm Summary of all the input
channels (open or closed) would be reported if the X120 is reset. To clear all the annunciator windows
before alarm summary, the following data would be sent:
Note: All the data is sent with even parity.