Eagle CUDA 250I S MAP, CUDA 250 Additional Instructions for
Pub. 988-0152-082
Addendum I
Additional Instructions for
Cuda 250 & Cuda 250i S/Map
The Cuda 250 contains a communications port for NMEA 0183 output.
The instructions for connecting data cables and setting up the
communications port appear in this addendum.
NMEA 0183 Data Cable Connections
NMEA is a standard communications format for marine electronic
equipment. The Cuda 250 can send information to any device that
receives NMEA 0183 data.
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This allows the unit to work with VHF marine radios equipped with the
Digital Selective Calling (DSC) distress call feature.
To send NMEA 0183 data, the Cuda 250 has one NMEA 0183 version
2.0 communication port. The com port can be used to send NMEA
formatted data such as your current position.
The provided Cuda 250 data cable plugs into the accessory socket on the
right side of the back of your unit's case. The data cable ends in two wires
that connect to your VHF radio or other NMEA device. The Cuda 250 uses
the yellow wire to transmit and the black shield wire for signal ground.
NOTE:
Some VHF radios, such as the popular Uniden
brand, have input
levels which require use of an additional diode and resistor built into
the Cuda 250 data cable. This is Wiring Diagram A, which is
described on page 2. The majority of the DSC radios will work with the
resistor and diode as provided by Eagle.
A few other radio brands (and other electronic devices) that meet the
NMEA 0183 standard won't need these adapters and you will have to
remove the resistor and diode to make those work. This is Wiring
Diagram B, which is described on page 4.
Consult your other device's owner’s manual, then read through all of
the following instructions before you begin. Use the installation
diagram most suited to your brand of radio or other device. If your
device manual indicates an RS-232 connection (i.e., a computer),
remove the resistor and diode and connect using Wiring Diagram B.
Most other connection types (TTL; NMEA + and NMEA –;
differential) will require Wiring Diagram A.
Recommended Tools and supplies
Recommended tools for this job include: wire pliers or wire stripper and a
wire cutter. Required supplies for this job include: two gray (18 gauge) or
blue (16 gauge) wire nuts and electrical tape. Supplies are not included.
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Wiring Diagram "A"
device
Yellow (Transmit)
Begin by stripping the wire ends of the device you're connecting to the Cuda
250. (You'll notice the Cuda 250 data cable comes pre-stripped, with wire
ends exposed.) Use a pair of wire pliers to strip about 1/4-inch (6.35 mm) of
insulation from each of the radio's or other device's data wires.
Strip the ends of the VHF radio's data wires. Connect them to the pre-
stripped wires of the Cuda 250 data cable (shown right).
Twist the exposed wires together as shown in the following figures. If
you're using a Uniden or similar radio, connect the radio's NMEA Wire
to the Cuda 250 data cable's yellow wire, and the radio's Ground/Shield
wire to the Cuda 250 data cable's black shield wire. If you're using
another radio brand or NMEA device, see Wiring Diagram B
instructions on page 4.
NMEA Wire (Receive) or NMEA +
Com port to
Cuda 250
Shield (Ground)
Ground/Shield or NMEA –
Com port wiring to transmit NMEA information
to a Uniden or similar VHF radio or other device.
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To Uniden
radio or other
Twist the appropriate wires together, making sure that the exposed
ends make good contact. Secure the wire ends with wire nuts, then
wrap each wire nut securely with electrical tape to protect against
moisture, as shown in the figure on the right.
After taping the wire ends individually, wrap the entire connection
with electrical tape as shown. This will help protect from moisture and
prevent the wires from breaking contact.
Wiring Diagram "B"
If your VHF radio or other device requires true RS-232, you will need to
remove the diode and resistor built into the end of the Cuda 250 data cable.
You will notice near the end of the cable a segment protected with black
heat-shrink. To connect the Cuda 250 to a true RS-232 radio, first
remove the Uniden adapter segment of the cable as shown in the
following figures.
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