JRC GPS 124 - User manual

- 1 -
INTRODUCTION
NOTES TO USERS
In order to ensure safe and correct use of the equipment, symbols in this manual and on
the equipment itself alert the user to important operational precautions that could prevent personal
injury or damage. The followings show such symbols and their meanings. Please read this manual
carefully and take note of these symbols.
Other Symbols and Their Meanings:
This symbol indicates that the action is prohibited.
This symbol indicates that the action must be taken.
WARNING This symbol indicates warning items that, if ignored,
may result in serious personal injury or even death.
Thank you for choosing the JRC GPS sensor GPS124.
This manual describes Model GPS124, JRC GPS Sensor (Receiver) with Built-In Antenna
and SBAS capability.
•To ensure correct operation of the GPS124, please read this Instruction Manual carefully before starting
to use.
•This manual should be kept on hand to provide as quick reference whenever you need it.
•It will also help you if you come across any problems in its operation.
ＧＰＳ ＳＥＮＳＯＲ
ＪＬＲ－４３４０
This symbol indicates cautionary items that, if ignored,
may result in personal injury or physical damage.
CAUTION
Prohibited
Do This
CODE: 7ZPNA4008 Sep. 2015 ed.6
JRC

- 2 -
SECTION 1 GENERAL INFORMATION
1.1 Function
By receiving GPS signals from up to twelve satellites, GPS124 sensor provides highly accurate
position fixing.
Furthermore, the GPS124 provides data output conforming to IEC61162-1 or the NMEA0183 format,
and it can be connected to various marine equipment such as radars, fish finders, and plotters.
1.2 Features
•SBAS function
The GPS124 can implement DGPS measurement by receiving the correction data from SBAS
satellite (WAAS/EGNOS/MSAS), and can achieve the measurement of high accuracy than the
GPS measurement.
•RAIM function
The accuracy of position fixes is self-tested by the equipment. (RAIM function)
This function assures higher reliability to the position fix than conventional method.
•Twelve-channel, twelve-satellite tracking, and all in view
Highly accurate position fixing is ensured by simultaneous tracking of up to twelve satellites by
twelve channels.
•Built-In DGPS function
Simultaneous using the external beacon receiver provides DGPS position fixing, and high
accuracy can be measured by the GPS measurement.
•Switching between IEC61162-1 (NMEA 0183 version 2.3)，NMEA0183 versions 1.5 and 2.1
The data output conforms to IEC61162-1 or NMEA 0183, and version switching is possible.
This feature allows the unit to be connected with various types of marine equipment including
radars, fish finders, and plotters.
1.3 Items Supplied
Table 1-1 indicates a listing of items that are included with your GPS124.
Table 1-1 Components of the GPS124
No. Name Model Name Quantity Notes
1 GPS Receiver JLR-4340 1 Including 10m (33ft) cable with
connector
2 Instruction Manual 1 Code: 7ZPNA4008
3
Warranty Card
Europe
North America
Asia/Oceania
1
1
1
Code: 7ZPBS2901C
Code: 7ZPBS2902E
Code: 7ZPBS2903C

- 3 -
SECTION 2 PARTS AND FUNCTIONS
１
２
３
４
６
５
MASS：less than 0.7kg
CABLE LENGTH: 10m
(
33ft
)
MOUNTING SCREW
１INCH 14 UNS-2B
DGPS Input (Brown)
0VDC (Black)
Data Common (White, Blue)
Data Output
(Green)
Set Data Input
(Yellow)
12VDC / 24VDC (Red)
① RECEIVER: Receives GPS signals from up to twelve satellites and provides highly accurate position
fixing.
② CABLE: Supplies DC power for the antenna and inputs/outputs data to a navigation equipment.
8-wire cable
③ BASE: Mount unit which conforms to 1"×14 NPT standards. With this, the Receiver can
be installed onto a 1-inch antenna mount or extension mast.
④ CONNECTOR: Hooks up the receiver to a navigation equipment. 6-pin
Fig. 2-2 connecter
① RECEIVER
② CABLE
④ CONNECTOR
③ BASE
Fig. 2-1 Parts of GPS124

- 4 -
SECTION 3 INSTALLATION
3.1 Unpacking and Checking
Take out the GPS124 from the packing case carefully.
Check each item listed in Table 1-1 is contained in the case.
Save the case and the packing material until the equipment will be installed successfully.
In case the equipment is to be returned, kindly use the kept packing material.
3.2 Locating the Position for Installation
Do not install the cable with tight bending, hard twist, kink, tension or strain.
These deeds give the cable exterior and / or interior damage.
Do not install this equipment in the place where an excessive vibration and a
shock otherwise it will cause defective reception of GPS signals.
Do not paint the outer cover of GPS124, receiver.
Painting may cause poor receiving.
Install the GPS124 where there is no obstacle, in order to ensure that GPS
signals can be directly received from satellites without interference or
reflection of signals from surrounding structures.
Determine the best location that meets as many criteria as possible
mentioned hereof.
If it is difficult to find an ideal site, select a place temporarily and install the equipment.
Conduct a test to make sure that the proper performance can be obtained and then fix the
equipment in position. A poor location could result in intermittent reception, which reduces the
time of the position fix and therefore, its accuracy.
1. An open space, which allows uniform reception of satellite signals
2. Far away from any high power transmission antennas
3. Outside radar beams
4. Away from the INMARSAT antenna by not less than 5 meters and outside the
INMARSAT beam
5. Away from the antenna of a VHF transmitter and a direction finder by not
less than 3 meters
6. Away from a Magnetic Compass by not less than 1 meter
CAUTION

- 5 -
3.3 Installation Procedure
The base of the GPS124 is designed so that it can be installed on the navigation antenna mount unit
or on an extension mast that conforms to 1” x 14 NPT standards. The bottom of the receiver is
provided with a slot to allow the receiver cable to be pulled out to the side. This eliminates the need
of pulling the cable through the center of an extension mast. If the cable is fed through the center
of a mast, the cable connector will have to be removed.
Caution:
When turning the receiver, be careful not to damage the cable and the plastic top cover of the
receiver. (See Figure. 3-1.)
When the cable is fed internally through the extension mast, it is recommended that RTV silicon
sealant be used to seal off the cable slot on the bottom of the receiver as a protection from the
environment. If the cable is laid sideway through the slot, secure it in position to reduce the
damage by vibration. Then seal the slot on the receiver bottom with the RTV silicon sealant.
(See figure.3-2)
3.4 Cable connection
3.4.1 Connection to Navigation Equipment that can be connected directly
CAUTION
When you connect the GPS124 to the navigation equipment that is possible
to connect directly, confirm the type of connector and pin arrangement
beforehand. If the possibility of direct connection with GPS124 is not
described in the manual of the navigation equipment, confirm the all pin
assignment. Incorrect pin connection may cause a damage of the equipment.
Cable tie or
Tape Cable
Seal with
RTV
Do not turn and grip the
cover
Grip the base to turn
Fig.3-1 Installation Fig. 3-2 Appearance