Lowrance electronic M68I User Manual download pdf

Pub. 988-0152-061

Addendum I

Additional Instructions for

Lowrance M68i S/Map

Your sonar/GPS unit, the M68i, functions exactly like the M68 de-

scribed in the manual provided (part 988-

0152-031). In addition, the

M68i contains a communications port for NMEA 0183 output. The in-

structions for connecting data cables and setting up the communica-

tions port appear in this addendum. The back page also includes a cor-

rection note for an error in the M68 manual.

NMEA 0183 Cable Connections

NMEA is a standard communications format for marine electronic

equipment. The M68i can send information to any device that receives

NMEA 0183 data. 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 M68i has one NMEA 0183 version 2.0

communication port. The com port can be used to send NMEA format-

ted data such as your current position.

The provided M68i data cable plugs into the accessory socket on the

right side of the back of your unit's case. This socket can connect either

an accessory such as a speed or temperature sensor or a NMEA 0183

data cable. The data cable ends in two wires that connect to your VHF

radio or other NMEA device. The M68i 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 lev-

els which require use of an additional diode and resistor built into the

M68i 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 Lowrance Electronics.

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 Dia-

gram B, which is described on page 3.

Consult your other device's owner’s manual, then read through all of

the following instructions before you begin. Use the installation dia-

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - Lowrance M68i S/Map

1Pub. 988-0152-061Addendum IAdditional Instructions forLowrance M68i S/MapYour sonar/GPS unit, the M68i, functions exactly like the M68 de-scribed in

Page 2

2gram most suited to your brand of radio or other device. If your devicemanual indicates an RS-232 connection (i.e., a computer), remove theresistor a

Page 3

3 Twist the appropriate wires together, making sure that the exposedends make good contact. Secure the wire ends with wire nuts, thenwrap each w

Page 4

4 For Wiring Diagram B installations, remove the Uniden adapter seg-ment at the end of your data cable as shown at left. Snip off the end ofthe ca

Page 5

5When the data cable is connected to your VHF radio, all you have to dois plug it into the sonar/GPS unit. Attach the data cable's plug to theacc

Page 6 - Configure NMEA

6If you need additional assistance in configuring the unit to communicatewith another device, consult the factory; customer service phone num-bers are

Page 7

7A menu appears showing the prefixes of the available NMEA sentences.A check mark next to a prefix means the prefix is in use. Use ↑ ↓ → ←to select a

Page 8 - Correction

8CorrectionOn page 69 of the M68 manual (part 988-0152-031), step 1 for enteringIce Machine mode is incorrect. It should read as follows:To enter the

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Lowrance electronic M68I User Manual

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