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1. OPERATIONAL OVERVIEW
1-8
1.6 The Interface Unit
The Interface Unit IF-2500 outputs data
received from the navigators to external
equipment. Operational status is shown by
the LEDs on the unit. For further details, see
the chapter on installation. For how to select
data to output, see paragraph 8.4 Outputting
Data.
Output data conventions
Since both navigators output data to the
IF-2500 (through two ports on the interface)
confusion would reign if it were to try to
output two sets of mostly identical data.
Therefore, data output is governed by the
following rules:
• When both navigators are outputting data
correctly, data received at the port having
higher priority is output.
• When the GPS abnormal receive signal is
received at the port having higher priority,
data received from the other port is output.
• 30 seconds after data received at the port
having higher priority becomes normal, the
interface unit resumes outputting data
received from that port.
• When data from both navigators is in error,
data received at the port having higher
priority is output.
• Arrival alarm signal or cross track error
alarm is converted to a contact signal and
output when received at the port having
higher priority.
• When no data is received from one or both
navigators, a contact signal is output.