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Display Mode set to “Slave”
Always set the ‘Display Mode’ to “Master” in
single display systems.
Two or more master displays connected to a
sensor
Set the ‘Display Mode’ on one display to
master and set all other displays to slave
No GPS indicator on
status line
No GPS data on NMEA input.
Check the NMEA data connections.
Check that the GPS unit is switched on.
Check that the GPS unit is set to output
compatible NMEA sentences
.
12.3
NAV6hub faultfinding
The NAV6hub is provided with 3 status LEDs. The one marked ‘POWER’ on the pcb
should always be lit when power is applied to the NAV6hub.
The other 2 LEDs indicate the status of communications on the 2 RS485 ports. Each
LED is only ON when a unit (display or sensor) is talking on the other port. The only
units that ‘talk’ are sensors and the ‘master’ display. The units talk 4 times per second
for a very short period each time. Thus the LEDs appear to flash ON for a short time.
LED Status
Indicates
Explanation
POWER LED off
No 12 V to NAV6hub Fault with power supply
Fuse tripped
POWER LED on
12 V connected to
NAV6hub
NORMAL OPERATION
PORT1 LED
flashing
Communication
received on Port1
NORMAL OPERATION
There is a sensor OR the master
display connected to Port2
PORT2 LED
flashing
Communication
received on Port2
NORMAL OPERATION
There is a sensor OR the master
display connected to Port1
Neither LED is
flashing
No communication
received on either
Port1 or Port2
Check that a display has been set to
‘master’
Check that the master display has
been set to ‘490’, ‘518’ or ‘Both’
receive frequencies
Check LK1 & LK2 link settings
One or both LEDs
continuously on
Fault condition
Contact the McMurdo Electronics
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