The following must be
observed during the operation of the IRMA passenger counting system:
The IRMA passenger
counting system counts persons, i. e. passengers, as long as the power supply
is active and the door contact sends a signal indicating that at least one
door is open.
This means that usually all boarding and alighting persons are counted.
Before the 1st stop, the count registers for boarding and alighting
passengers and the output buffers in the analyser must be reset to zero by an
additional polling by the on-board computer. Otherwise, the persons counted
before the 1st stop will be added to the passengers of the 1st
stop.
The figures for boarding and alighting
passengers are contained in the analyser after each passenger change. If the
power supply of the passenger counting system is switched off before these
figures have been polled by the on-board computer, the figures are lost (for
example at the final stops). To avoid data loss at all stops, it is
recommended that the power supply of the IRMA passenger counting system is
implemented by means of a seal-in circuit or by the connection to "permanent
live".
If the final stop of a
line is also the starting point of the following line,
in most cases all counted alighting passengers of the given stop are to be
allocated to the previous line by the on-board computer and all counted
boarding passengers to the subsequent line.
If the vehicle stays at the final stop
for a longer time and the power supply of the IRMA passenger counting system
has not been implemented by means of a seal-in circuit or connection to
"permanent plus", the counts can be "saved" by additional polling, for
example 30 seconds after arriving at the final stop.
Undesired counting of the
driver
at the final stops can be reduced, if the on-board computer forms the
difference between boarding and alighting passengers at door 1.
All data records of communication
between on-board computer and IRMA can be transmitted several times in
succession, e.g.
on-board computer call
data record:
IRMA response data
record:
bF1
bF1
bE1
bE1
bS1
bS1
bF
bF
bEEAA
bEEAA
bSZ (Z=0, 1, 2, 3 oder 4)
bSZ etc.
The data records bFH and bEH (H = door
address) may not be sent with the doors open, as this can result in errors in
the counting results!
The log of status polling
can be sent in cycles, e. g. every 10 seconds.
If the response data
record bS3 reports a fault in the function of the passenger counting system,
all other call data records bSH of this address are also followed by the
response data record bS3, until the fault has been repaired and the power
supply of the passenger counting system has been switched off and on again.
If the ignition of the vehicle is
switched off and the door contact input of the analyser is without voltage
supply, the door contact should be implemented as logically negative.
Only then the door contact will recognize an opened door as being open and
count boarding and alighting passengers.
If the passenger counting system
transmits the message
IRMA sabotaged for several stops in succession
(response data record bS4), the installation at the relevant door should be
checked. It is probable in this case that a sensor was sabotaged by covering
or sticking-up.
