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Garmin TR-1 Gladiator Manual

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The TR-1 Autopilot is designed in conformance with the NMEA 0183 standard. The
TR-1 will communicate reliably and safely when connected to other devices that meet this
standard with the normal wire connections.. Any device that requires a signal connection
to ships ground is not in compliance with the standard.
The installer needs to conrm that
connections to non-compliant devices are wired in a fashion to ensure a safe and effective
connection. In these cases the following procedure shall be followed.
An indication that a device may be a non-compliant device is that the GPS signal is accepted by
the TR-1, but the RADAR shows no heading data, or has an intermittent heading input signal.
When connecting the NMEA heading output to a non-compliant NMEA device, the NMEA
positive signal from the TR-1 shall be connected to the receiver NMEA positive signal. The
connection should then be tested to see if communications have been established, that is to say,
does the intended receiver indicate that valid heading data is being received from the TR-1. If
so then no other connections need to be made.
If the data is not being received by the receiving device, try to connect the receiving device
power ground to the same power ground as the TR-1.
If this cannot be done, a last resort is to connect the power ground of the receiver to the green
wire ground connection of the TR-1 NMEA interface wires through a 125mA inline fuse. It is
VERY important that the grounds never be connected without the fuse as this can create
a re hazard in the boat.
Please contact TR-1 Autopilot technical support for assistance.
When connecting the TR-1 NMEA input to a non-compliant device there should be no problem
as the NMEA standard allows this connection to be made safely, although in this case ground
noise may show up on the signal and cause intermittent problems. If these problems are
experienced, a possible solution is to be certain that the “signal ground” and the power ground
are connected at the same point.
Non-Compliant NMEA 0183 Devices
… 35


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