Lowrance M52i S/GPS Owner's Manual
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Lowrance M52i S/GPS Owner's Manual

Lowrance M52i S/GPS Owner's Manual

Sonar/gps unit
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Additional Instructions for
Lowrance M52i S/GPS
Your sonar/GPS unit, the M52i, functions exactly like the M52 de-
scribed in the manual provided (part 988-0152-001). In addition, the
M52i 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.

NMEA 0183 Data Cable Connections

NMEA is a standard communications format for marine electronic
equipment. The M52i 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 M52i 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 M52i 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 M52i uses the
yellow wire to transmit and the black shield wire for signal ground.
NOTE:
Some VHF radios, such as the popular Uniden
els which require use of an additional diode and resistor built into the
M52i 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-
gram most suited to your brand of radio or other device. If your device
Addendum I
1
Pub. 988-0152-071
brand, have input lev-

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Summary of Contents for Lowrance M52i S/GPS

  • Page 1 Additional Instructions for Lowrance M52i S/GPS Your sonar/GPS unit, the M52i, functions exactly like the M52 de- scribed in the manual provided (part 988-0152-001). In addition, the M52i 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.
  • Page 2 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 re- quire Wiring Diagram A. Recommended Tools and supplies Recommended tools for this job include: wire pliers or wire stripper and a wire cutter.
  • Page 3 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.
  • Page 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 of the cable protected by the black heat-shrink. At right, we have used clear heat-shrink for clarity, so you can see the diode and resistor pro- tected within.

  • Page 5: Communications Port Configuration

    When the data cable is connected to your VHF radio, all you have to do is plug it into the sonar/GPS unit. Attach the data cable's plug to the accessory socket on the right side of the back of your unit's case.

  • Page 6: Configure Nmea

    Configure NMEA Once in the Communication Ports menu, you can configure the unit to use specific NMEA sentences. (The default setting has all NMEA sen- tences turned on.) Press ↓ to A menu appears showing the prefixes of the available NMEA sentences. A check mark next to a prefix means the prefix is in use.
  • Page 7 As more marine electronics manufacturers enter this growing market, other connectivity issues with your unit may appear. You can check for known compatibility issues by visiting our web site, www.lowrance.com. Look in the Manuals section for updated documents for your sonar/GPS unit.
  • Page 8 This addendum supplements the manual , part number 988-0152-001. Pub. 988-0152-071 © Copyright 2004 All Rights Reserved Printed in USA 022704 Lowrance Electronics, Inc.

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