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4.4.3 Station order check test (optical loop system only)
This test checks the order of connected stations in the optical loop system.
The following table lists the correspondence between the loop status and the order of stations that can be checked in
the test.
When the station order check test is performed using a peripheral connected to the remote master station in the
system above, the following window appears. The result shows that the loopback is performed in the stations, the
station number 2 and 1, connected in the forward loop direction.
Loop status Display contents
Forward/reverse loop
The station numbers connected in the forward loop direction from the host station and the station numbers
connected in the reverse loop direction from the host station
Forward loop Only the station numbers connected in the forward loop direction from the host station
Reverse loop Only the station numbers connected in the reverse loop direction from the host station
Loopback Only the station numbers connected in the forward loop direction from the host station
Peripheral Station No.0
Remote master station
Station No.2
Loopback
Station No.3
Faulty station
Station No.1
Loopback
Station No.4
Reserved station
OUTIN
OUT IN OUT IN OUT IN
OUTIN
Forward loop direction
Reverse loop direction
The station No.4 is
not displayed
because it is a
reserved station.