DIGITAL WATER TEMPERATURE INDICATOR Model T-2000
s Large backlit LCD display s Audible and visual alarms for preset temperature limits or temperature shear. s Either Celcius or Fahrenheit readout s Temperature data output for external devices on FURUNO CIF or NMEA 0183 bus
The FURUNO model T-2000 is an innovative and very cost-effective Digital Water Temperature Indicator designed to aid the fisherman pinpoint areas where the fish are most likely to be gathered. A built-in microprocessor displays information with large characters on the LCD screen for easy viewing, even from across the cockpit or pilothouse. Temperature is shown in either degrees Celsius or Fahrenheit. One of the unique features of the T-2000 is that the temperature "Trend" is shown, with either an upward arrow to show a slow, rising trend, or a downwards arrow to show a slow, falling trend. Where there is an area of abrupt temperature change, the T-2000 alerts you with a "shear" alarm: this usually signals the presence of a rip current, where two currents at different water temperatures meet and is often a place where the fishing is especially good.
s Trend arrows to show whether temperature is rising or falling s Compact, rugged display may be bracket or flush-mounted s Choice of sensor: Transom or ThroughHull Mounting
Since different species of fish are known to congregate within well-defined temperature limits, you may utilize the T-2000 to alert you when you are in a predetermined temperature zone that favors the species you want to find. The T-2000 is a good communicator too. Water surface temperature can be put onto other FURUNO instruments via the FURUNO CIF format, for example, Color Video Sounders, Video Plotters, computers, etc. In addition temperature data may be fed to instruments that utilize the NMEA 0183 format ($MTW or $MR1). The T-2000 is miserly on power drain, taking less than 1 watt for 10-15 VDC power mains. The display may be ordered for mounting using a bracket, or for flushmounting into the boat's instrument panel. The transducer may be ordered for mounting either on the transom or thru-hull.

Catalogue No. M-1505f

The future today with FURUNO's electronics technology.
FURUNO ELECTRIC CO., LTD.
9-52 Ashihara-cho, Nishinomiya City, Japan Telephone: +81 (0)798 65-2111 Telefax: +81 (0)798 65-4200, 66-4622, 66-4623 TREDE MARK REGISTERED MARCA REGISTRADA

READOUTS

Flashes when the alarm is released
Lower threshold for temperature alarm
Higher threshold for temperature alarm

CONTROLS

High temperature setting and alarm on/off Lower temperature setting Power ON switch. Further pressing switches backlight on/off Each pressing changes audible alarm on/off. When pressed simultaneously with Power ON switch, the system is switched off. Shear alarm setting and alarm on/off
Upward Trend Marker Downward Trend Marker Flashes when shear alarm is released

Shear Alarm preset value

Audible alarm indicator

(PANEL MOUNT TYPE)

SPECIFICATIONS OF T-2000
1. 2. 3. 4. 5. LCD Display 3.1"(W)X 1.6" (H), backlit Measuring Range -5 to +35C or +23 to +95F Accuracy 0.2C or 0.4F Display Resolution 0.1C or 0.1F Trend Monitor Compares latest data and that obtained 10 seconds ago and, presents up or down arrow depending on whether the temperature is rising or falling Alarm Shear Alarm Alarm is given when the temperature changes by more than preset value in one minute. Preset Value: 0.1 to 9.9 in 0.1 steps (F or C) Temperature Alarm Alarm is given when the temperature is outside or inside of the preset temperature zone Preset Value: -5.0 to +35.0C in 0.1C steps or +23.0 to +95.0F in 0.1F steps Interface Temperature data output on Furuno CIF or NMEA 0183 format ($--MTW or $--MR1) Sensor Thermistor Power Supply 10 - 15 VDC, less than 1 W EQUIPMENT LIST (Standard) 1. Display Unit
Specify whether bracket or panel type

1 unit 1 unit

2. Temperature Sensor (with 8 m cable)
Specify Transom mounting, Thru-hull Mounting (Bronze), or Thru-hull Mounting (Bronze) with seal cap Note: The Display Unit and selected Sensor are factorycalibrated for use with each other
3. Installation Materials and Spare Parts (Optional) 1. CIF/NMEA Interface Cable CHOICE of SENSORS with 8 m cable

Transom Mounting T-02MTB

Thru-Hull Mounting Thru-Hull Mounting (Bronze) (Bronze, w/seal cap) T-02MSB T-03MSB
Display Unit with Bracket
196 7.7" 172 6.8" 35 1.4"
Display Unit for Panel Mount

198 7.8"

66 2.6"
4-7 (140 5.5") 36 1.4" (186 7.3")

86 3.4"

(40 1.6")

92 3.6"

Weight 350 g 15.0 oz w/bracket
Weight 330 g 14.1 oz w/mounting panel
Cutout size 176W x 70H (mm)
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

FURUNO U.S.A., INC.

Camas, Washington, U.S.A. Phone: +1 360-834-9300 Telefax: +1 360-834-9400

FURUNO DANMARK AS

Hvidovre, Denmark Phone: +00 Telefax: +01

00052B Printed in Japan

FURUNO (UK) LIMITED
Denmead, Hampshire, U.K. Phone: +44 2392-230303 Telefax: +44 2392-230101

FURUNO NORGE A/S

lesund, Norway Phone: +102950 Telefax: +127021

FURUNO FRANCE S.A.

Bordeaux-Mrignac, France Phone: +Telefax: +48 01

FURUNO SVERIGE AB

Vstra Frlunda, Sweden Phone: +46 31-7098940 Telefax: +46 31-497093

FURUNO ESPANA S.A.

Madrid, Spain Phone: +34 91-725-90-88 Telefax: +34 91-725-98-97

FURUNO SUOMI OY

Helsinki, Finland Phone: +Telefax: +3417 5716

Furuno CAN bus Network Design Guide

Pub. No. TIE-00170-A

This document describes the Furuno CAN bus and shows how to create Furuno CAN bus networks and how to install Furuno CAN bus devices.
1. What is Furuno CAN bus?
Furuno CAN bus devices comply with NMEA 2000 physical and protocol standards, but these devices can be installed in a slightly different way from the NMEA2000 standard to make a network creation easier. NMEA 2000
NMEA 2000 is a combined electrical and data specification for a marine data network for communication between marine electronic devices such as depth finders, chartplotters, navigation instruments, engines, tank level sensors and GPS receivers. NMEA 2000, a successor to the NMEA 0183 standard, connects devices using CAN (Controller Area Network) technology originally developed for the automotive industry. CAN based networks were developed to function in electrically noisy environments. NMEA 2000 vs. NMEA 0183 NMEA 2000 is a serial data network operating at 250k bps and NMEA 0183 is a serial data interface operating at 4.8k bps. NMEA 2000 networks allows multiple electric devices to be connected together on a common channel for the purpose of easily sharing information. Table 1 NMEA 2000 vs. NMEA 0183 Connector Data rate Protocol NMEA 2000 Standard connectors (Plug and play) 250k bits/second Compact binary message Multi-talker, multi-listener Network NMEA 0183 Different connectors of each manufacturer 4.8k (38.4k) bits/second ASC II serial communication Single-talker, multi-listener Serial communication (Point to point communication)
CAN vs. Ethernet NMEA decided to choose CAN to develop a low-cost, self-configuring, and multi-master network. The table below shows other advantages of CAN over Ethernet. Table 2 CAN vs. Ethernet CAN Power Consumption Bandwidth Collision Avoidance Message Priority Lower Low Yes Yes Ethernet Higher High No avoidance (Collision detection) No

1.2 Network Connections

Like a NMEA 2000 network, Furuno CAN bus networks consist of lengths of network Backbone cable with a defined beginning and end. A resistive terminator (120 ohms, 1/4 W) is connected at each end to reduce transmission-line reflections. See Fig.1. Furuno Can bus devices are connected to the network backbone cable with a single Drop cable. The maximum cable length of the drop cable is 6 m and the sum of the drop cables should not exceed 60 m. Power supply or battery connections are made to the network backbone cable either directly or by means of a dedicated cable. Some Furuno CAN bus devices can power the network through the network connector.

Furuno CAN bus Device

Drop cable 6 m (max.)

Drop cable Drop cable

Terminator NMEA 2000 T-connector

Backbone cable

Terminator
+Vdc Gnd Shield (15 Vdc recommended)
Fig.1 Typical Furuno CAN bus Network Topology The T-connector is used to construct a Furuno CAN bus backbone and to extend the backbone with appropriate lengths of backbone cable. The T-connectors can be separated by the backbone cable or connected directly together. When constructing the network, take the following into account; 1) Use one T-connector per device (see Fig.3). 2) Use the sides of the T-connectors to construct the backbone of the network. (Furuno CAN bus device with an internal terminator is connected to the side of the T-connector.) Fig.5 3) Use the top of the T-connector to attach a device.

Device Device

Device
Daisy Chain Connection Example
A Furuno CAN bus device, the FI-50, can be connected in daisy chain without the T-connector as shown in Fig.8.

Power supply

Fig.8 Daisy chain connection of FI-50 series
The network connection is made by two methods for all types of connections: a connector and barrier strips. The connections are used; (a) (b) (c) (d) For connecting segments of backbone cable together For connecting terminations at the two ends of the cable For connecting the network power source, and For connecting devices.

Two types of the connector; Mini for heavy cable and Micro for light cable are used for NMEA 2000 network connections. Barrier strips are only recommended when the connections are made in a protected location, or when they are installed in a weatherproof enclosure. Two methods may be used together in the same network.
Fig.9 shows a typical network connection made with barrier strips. When used for termination resistors, all five wires are attached to the barrier strip and the termination resistor, 120 ohms, 1/4 W connected between NET-H and NET-L. No connections are allowed to the other terminals.
Fig.9 Barrier strips Star type connections are not allowed.
Fig.10 Barrier strip - Improper connection

1.3 Network Cable

Two types of cable are used in the network, heavy cable and light cable. The selection of cable type for various portions (including the drop cable) of the network depends on the number of Network loads attached, the length of the network cables, and the location of the specific cable in the network. Heavy cable The heavy cable is five-wire constructed with two individually twisted-shielded pairs enclosed by an overall shield with a shield drain wire connecting all three shields. Table 3 shows the wire colors of the heavy cable (10 mm diameter, MAX. 8 A).
Table 3 Wire colors of heavy cable
Name Shield NET-S NET-C NET-H NET-L Pair Drain Power Power Signal Signal Color Bare Red Black White Blue Size 18AWG 16AWG 16AWG 18AWG 18AWG Pin# 5
Light cable The light cable is five-wire constructed with two individually twisted-shielded pairs enclosed by an overall shield with a shield drain wire connecting all three shields. Table 4 shows wire colors of the light cable (6 mm diameter, MAX. 1 A). Table 4 Wire colors of light cable
Name Shield NET-S NET-C NET-H NET-L Pair Drain Power Power Signal Signal Color Bare Red Black White Blue Size 22AWG 22AWG 22AWG 24AWG 24AWG Pin# 5

1.4 Network Connector

Furuno CAN bus network uses NMEA2000 standard 5-pin connectors for the network connections: Mini for the heavy cable and Micro for the light cable. Note that FI-50 series uses the L-type Micro connector. Table 5 and Figs.11 to 14 show Furuno CAN bus connector pin functions and face views. These connectors comply with NMEA2000 LTW connector standard. Table 5 Pin function of Furuno NMEA 2000 LTW connector
Pin No. 5 Function Shield NET-S (Power supply positive, +V) NET-C (Power supply common, -V) NET-H (CAN-H) NET-L (CAN-L) Color Bare Red Black White Blue

25.0 mm

Fig.11 Female Mini connector

Fig.12 Male Mini connector

14.5 mm

Fig.13 Female Micro connector
Fig.14 Male Micro connector
The following list shows the backbone/drop cables. To extend the backbone cable, use the cable with a male connector on one end and a female connector on the other. For example, if you need 15 meter cable, connect two 6 m cables, a 2 m cable, and a 1 m cable. Either heavy cable or light cable is used as a backbone cable. Note that the length of drop cable is 0 to 6 m.
Parts Name CAN bus light cable (1 m) CAN bus light cable (2 m) CAN bus light cable (6 m) CAN bus light cable (1 m) CAN bus light cable (2 m) CAN bus light cable (6 m) Type M12-05BM+05BF-010 M12-05BM+05BF-020 M12-05BM+05BF-060 M12-05BFFM-010 M12-05BFFM-020 M12-05BFFM-060 Code Number 000-167-962 000-167-963 00-167-964 000-167-965 000-167-966 000-167-967 000-167-968 000-167-969 000-167-970 000-167-971 000-167-972 000-167-973 Connector fitted Male and Female Male and Female Male and Female Female Female Female Male and Female Male and Female Male and Female Female Female Female
CAN bus heavy cable (1 m) CB-05PM+05BF-010 CAN bus heavy cable (2 m) CB-05PM+05BF-020 CAN bus heavy cable (6 m) CB-05PM+05BF-060 CAN bus heavy cable (1 m) CB-05BFFM-010 CAN bus heavy cable (2 m) CB-05BFFM-020 CAN bus heavy cable (6 m) CB-05BFFM-060
Fig.15 CAN bus light cable with a connector at both ends
Fig.16 CAN bus light cable with a connector at one end

1.5 T-connector

There are two types of T-connectors: Mini for heavy backbone cable, Fig.17 and Micro for light backbone cable, Fig.18. Parts Name Mini T-connector Type NC-050505-FMF-TS001 Code Number 000-160-507 000-168-603 Remarks for heavy cable for light cable
Micro T-connector SS-050505-FMF-TS001
Female, Micro Female Male Female

Female

Fig.17 Mini T-connector (NC-050505-FMF-TS001)
Fig.18 Micro T-connector (SS-050505-FMF-TS001)

1.6 Terminator

Furuno CAN bus 120-ohm terminators are available with the following part numbers. The terminator should be attached at each end of the backbone cable. The terminator has a 120-ohm resistor across pins #4 and #5.
Parts Name Male terminator Female terminator Male terminator Female terminator
Type LTWMN-05AMMT-SL8001 LTWMN-05AFFT-SL8001 LTWMC-05BMMT-SL8001 LTWMC-05BFFT-SL8001
Code Number 000-160-508 000-160-509 000-168-604 000-168-605
Remarks Mini connector, Fig.19 Mini connector, Fig.20 Micro connector, Fig.21 Micro connector, Fig.22
Fig.19 Male terminator for heavy cable
Fig.20 Female terminator for heavy cable
Fig.21 Male terminator for light cable
Fig.22 Female terminator for light cable

Termination with MFD

The MFD unit is terminated with a terminator as shown in Fig.23, because the unit does not have the internal terminator.

T-connector Terminator

CAN bus cable or NMEA2000 cable
Backbone cable (to rest of bus)

Female Terminator

Fig.23 Termination with MFD

Internal Terminator

Furuno CAN bus devices, DRS, FI-50, GP-330B, SC-30, and WS-200 have an internal terminator, so these devices can be connected to the backbone cable as shown in Fig.24. By connecting the device to the backbone cable, the cable length between the T-connector and the device can be extended more than 6 m.

GP-330B

Fig.24 Using internal terminator at both ends of backbone cable To activate the internal terminator; (a) DRS The resistor assembly, 120 OHM-1007#24-L50, C/N: 000-167-746 is connected between #5 and #6 of J603 in the radome antenna and #4 and #5 of TB102 in the open type antenna. #5 & #6 TB102 J603
#4 & #5 Fig.25 Terminator in DRS2D/4D
Fig.26 Terminator in DRS4A/6A/12A/25A
(b) GP-330B The supplied contact pin, 05-251-01 (C/N: 000-168-935) is inserted into socket #5 in the connector before connecting it to the antenna.

Contact pin

Fig.27 Termination on GP-330B (c) WS-200 The same contact pin as GP-330B is used for termination. (Type: 05-251-01)
(d) SC-30 Use the cable, MJ-A10SPF0015-15/30 of which 10-pin MJ connector has a 120-ohm resistor connected between pins #4 and #5.
>1> >2> >3> >4> 120-ohm resistor >5> >6> >7> >8> >9> >10> BLU
MJ-A10SPF0015 Connector has a resistor.

Drain RED BLK WHT

PPL YEL GRN
Fig.28 Termination on SC-30 (e) FI-50 The terminal resistor is on and off through Setup2 menu. To show setup2 menu, press following two keys at a time until the menu appears. FI-50 series FI-501/502/505 FI-503 FI-504 FI-506 To get into Setup2 mode, press 3rd and 4th keys from left LOWER and SELECT/CLEAR APP/TRUE and SELECT/CLEAR BRILL and Left arrow key (To save the change, press BRILL and Left arrow key again.) To choose item, press MODE Upper DISP Right arrow key

1.7 Network Power Supply

The Furuno CAN bus network devices operate at 9.0 to 16.0 Vdc. Ensure that the voltage of power supply to the device located farthest from the power source on the network is 9.0 Vdc or more. The total current carrying capacity of the network depends on the choice of backbone cable and where the power is connected into that cable. The heavy cable is rated at 8 Amps and the light cable is rated at 1 Amps. Both of these ratings are at 20 degrees Celsius and must be de-rated with temperature. If the power connection is made to the center of the backbone cable, then the current carrying capacity is effectively doubled as the full capacity is available to each end of the network from the power connection point.

For CAN bus network with DRS
The DRS series outputs 15 Vdc, 1A from the network port to the CAN bus devices in the network. The power supply cable connection to the network is not necessary when the DRS is in the network. The power connection is at either the end or middle of the network. Note that the pin assignment of the network port differs between radome and open antennas. J603 in Radome Antenna Pin No. Signal name Remarks 1 SHIELD 2 NC 3 NET_S V+ (+15V) 4 NET_C V5 NET_H CAN_H 6 NET_L CAN_L TB102 in Open Antenna Pin No. Signal name Remarks 1 SHIELD 2 NET_S V+ (+15V) 3 NET_C V4 NET_H CAN_H 5 NET_L CAN_L
The number of the devices that can be connected to the network powered from the DRS depends mainly on the network load. For example, Weather Station, WS-200 and Satellite Compass, SC-30 are not connected to the DRS via CAN bus at the same time due to overload. The following section describes the network load calculation.

GP-330B WS-200 SC-30

Combination:

YES YES

YES NO

NO YES

15 Vdc, 1A
Fig.29 Furuno CAN bus powered from DRS (No network power cable required) When both the SC-30 and WS-200 are connected to the network with the DRS, disconnect pins 3 and 4 of J603 on the CAN bus interface board, 03P9462 in the DRS and connect an external 15-Vdc power supply to the network backbone cable.
Fig.30 shows the simplified circuit diagram of power supply circuit on the CAN bus interface board, 03P9462. The circuit is protected by a 1.5 A onboard fuse.
03P9462 VCC_CAN From PWR PCB J602 F1 (1.5 A) +15 V H >1> Regulator +15 V C >2>
J603 >5> Net_H >6> Net_L >3> Net_S (+15 V) >4> Net_C
Fig.30 CAN bus interface board in DRS
For CAN bus network with MFD
The Furuno CAN bus network is powered through the MFD unit: the power supply or battery is connected to pins #17 (NET_S_IN) and #18 (NET_C_IN) of 18-pin DATA 2 connector on MFD8/12/BB with a 1-A in-line fuse and switch. See Figs 31 and 32. The output voltage of the power supply is ideally 15 Vdc +/-5%, ripple 0.25 Vp-p or less as NMEA2000 standard, considering input line variation and DC drop in the network power cable. Do NOT connect the network to a 24 Vdc power supply. Isolation from other devices power and grounds of the power supply must be maintained.

NMEA2000

Fig.31 Connection of power supply to network through MFD
18-pin pigtail cable for DATA 2 port Type: FRUDD-18AFFM-L180 C/N: 000-164-608

Pink Pin #17

1 amp Fuse and in-line switch (Local supply) To network bus (11.6Vdc, 1A with a 12 Vdc power supply connected) 12 to 24 Vdc for MFD

Light green Pin #18

10 Vdc to 16 Vdc, 1 amp Maximum
Fig.32 Connection of network power supply to MFD
A diode and a polyswitch (SMDC110F) on CONT2 board in the MFD unit protect the interface circuit against over-current and short-circuit. See Fig.33.

J3 DATA2

J4 NMEA2000
NET_S_IN >17> NET_C_IN >18>
>1> >2> >3>
>2> NET_S >3> NET_C >4> NET_H >5> NET_L
Fig.33 Protection of network power circuit in MFD The maximum length of the network backbone is 150 m when the heavy cable is used and 50 m when the light cable is used. More details are explained in the CAN bus Network limitations section.

1.8 Network Grounding

The network is grounded at a SINGLE location. This is normally done at the power supply connection to the network and should be well connected to the vessels grounding system. There must be no other ground connections on the network to avoid the problem of ground loops, which can harm the network performance.
1.9 Connecting NMEA 0183 Device
An NMEA 0183 device is connected to the CAN bus network via MFD unit or by using NMEA2000 Interface unit, IF-NMEA2K1.

NMEA0183

(MAX. 3 units)
NMEA-CAN bus Interface unit IF-NMEA2K1
Fig.34 Connection of NMEA0183 to CAN bus network
1.10 CAN bus Network Limitations
When building a CAN bus network, keep in mind following limitations.
1.10.1 Single MFD in CAN bus network
Single MFD or DRS unit, one of MFD8, MFD12, MFDBB, and DRS is connected to a Furuno CAN bus network. Do NOT connect two or more MFD and/or DRS to the Furuno CAN bus network. The DRS and MFD units are connected each other via Ethernet.

MFD (DRS) MFD (DRS)

Fig.35 Single MFD or DRS in Furuno CAN bus network
1.10.2 Backbone Cable Length
Load Equivalency Number (LEN) Like NMEA2000, the power rating of the Furuno CAN bus device is specified as a Load Equivalency Number, or LEN and used in planning network installations. One network load is defined as 50 mA or any portion thereof (e.g., a device taking 51 mA from the network power bus is a Two LEN device). A LEN of 4 means that the device consumes up to 4 x 50 mA = 200 mA. Table 6 shows the LEN of Furuno CAN bus devices. Table 6 LEN of Furuno CAN bus devices Model LEN MFD BB 1 MFD 8/SC-GP-330B 3 WS-FI-50 series* 2

*: FI-501/502/503/504/505/506
Use Tables 7 and 8 to find the maximum length of the backbone cable. First calculate the total LEN of the devices in the network. In the example of Fig.36, the total LEN is 1+ 1 + 2 +2 = 6. Then, find the maximum cable length for the LEN of 6 in Table 7 or 8: 150 meters for heavy cable and 50 meters for light cable when the network is powered from 15 Vdc power supply. When the network is connected to 12 Vdc power supply, the maximum cable length is about half the value in Tables 7 and 8.

CAN bus Device LEN = 1

CAN bus Device LEN = 2

Fig.36

Practically, total LEN in the network is less than 20, so the overall cable length can be extended up to 150 m with heavy cables and 15 Vdc power supply. When both heavy and light cables are used in the network as shown in Fig.10, the length of cable B is calculated by using the following formula. B = (X A )/4 Where, X is the maximum cable length obtained from the table.

A = 40 m

Heavy cable Power supply

Light cable

Fig.37 Assuming that the total LEN in the network is 50 and the heavy cable length, A is 40 m; B = (80 m 40 m) / 4 = 10 m When power supply is connected to the middle of the network as shown in Fig.38, the cable length of A and B is determined individually. For example, if the total LEN of devices attached to the cable A is 75, the maximum length of cable A is 50 m from Table 7. Do the same for B. The total length of cables A and B is less than 150 m.
Fig.38 Middle-powered CAN bus network When the power cable is connected to both ends of the network, the cable length is double the value obtained from the table. In any case, the cable length does not exceed 150 m. For example, the maximum cable length is 150 m, even if the calculated value is 180 m. Note that power supplies are isolated and the shield connection is made at only one power supply (single-point ground) in multiple power supply configuration. Do NOT use a combination of battery and power supply connections.
Fig.39 Multiple power supply configuration

1.10.3 Drop Cable Length

The total drop cable length must not exceed 60 m and no single drop cable should exceed 6 m.

1.10.4 Device Limitation

No more than 20 (LEN) CAN bus devices can be connected to the Furuno CAN bus network powered from the DRS and through the MFD unit. The total LEN of the devices connected to the heavy backbone cable should not exceed 160 and 20 for the light backbone cable.
Table 7 Total LEN vs. Heavy backbone cable length (Power source: 15 Vdc *)
Total LEN < Max. (m) Total LEN Max. (m) Total LEN Max. (m) Total LEN Max. (m) Total LEN Max. (m) 25 25
*: When 12 Vdc power source is connected to the network, divide the cable length in halves.
Table 8 Total LEN vs. Light backbone cable length (Power source: 15 Vdc *)
Total LEN <18 Max. (m) 50 Total LEN 19 Max. (m) 50 Total LEN 20 Max. (m) 45

1.11 Adding a New Device

A new device is added to a working network bus by using the following procedure. First, add an additional T-connector anywhere along the network backbone where a connection already exists. The connection is at the end of the network (between a T-connector and a terminator), between two T-connectors, between a T-connector and a backbone extension cable, or between two extension cables. Separate the connectors of the old connection and attach new T-connector between them. Then, connect the device to the T-connector by using a drop cable. There are a few things to consider: 1) Voltage drop between the power source and the device located farthest from the power source is 3.0 Vdc or less when 12 Vdc battery is used. 2) Total network load must be considered. When the network is powered though the MFD and from the DRS, total LEN is 20 or less. 3) The network is terminated to function correctly.
1.12 Using Junction Box FI-5002
By using FI-5002 Junction Box, Furuno CAN bus is designed without T-connectors and terminators. The FI-5002 has 120-ohm terminal resistors, six terminal blocks for the connection of up to 6 devices, and two terminal blocks for the connection of backbone cables for network expansion. The junction box is not waterproof. Fig.40 shows simplified schematic diagram of FI-5002. A three-way terminal block is used for the network power connection.
CN1 #1 Shield #2 NET-S #3 NET-C #4 NET-H #5 NET-L
To power supply (12 Vdc, 2A MAX)

To device (CN3 to CN5)

To backbone cable and/or FI-5002 (or not used)
Fig.40 Connection of terminal blocks in FI-5002
Fig.41 shows a typical Furuno CAN bus network by using a junction box FI-5002.

FI-5002

CN1 CN2 CN3 to CN5 MAX. 6 m CN2
: Internal terminator 12 Vdc

(Max. 6 devices)

Fig.41 Typical connection on FI-5002
To connect the internal termination resistor to the end of the network bus, set the jumper block as below. 1) When no backbone cable is connected, R1 and R2 are set to ON position. 2) When one backbone cable is connected, either R1 or R2 is set to ON position. 3) When two backbone cables are connected, R1 and R2 are set to OFF position.

Jumper block

: Resistor is disconnected. (OFF) : Resistor is connected. (ON) R2 R1

CN1 CN3 CN4 CN5 CN2

PWR cable

Drop cables

Backbone cables
Fig.42 Internal terminators in FI-5002
The FI-5002 is added anywhere along the network backbone. A maximum of three FI-5002 is connected in series.

CN2 Terminator 12 Vdc

T-connector
Fig.43 Network with FI-5002 and T-connector

Terminator 12 Vdc

Fig.44 Network with two terminators connected to T-connectors

CN2 CN2 CN2

CN2 CN2

12 Vdc

Fig.45 Three FI-5002 in network

1.13 NavNet Bridge

Two or more CAN bus networks can be connected by using MFD and DRS via Ethernet as shown in Fig.46. All devices share the sensor data in the network. The connection of the DRS having a CAN bus network to the MFD in the bridge eliminates the duplication of the cable run to the sensors outside.
Device CAN bus network (1) Device

Outside bridge

Ethernet
Device MFD8/12/BB Power supply Device CAN bus network (2) Device Device
Fig.46 Simplified NavNet Bridge connecting two CAN bus networks
More complex networks are designed by using a network Hub, HUB-101 as shown in Fig.47.

CAN bus (1)

PSU-012

HUB-101

12-24 Vdc

DFF-1/3

12 Vdc for CAN bus

CAN bus (2)

Instrument, FI-50 series Smart Sensor, DST-800
Fig.47 Two or more MFD in network The number of devices that can be connected to the network is; DRS series: HUB-101: MFD8/12/BB: 2 units 3 units 10 units
The MFDBB has a built-in 4-port Hub, so up to two HUB-101s are connected to the network with a MFDBB. The Ethernet ports 1 and 2 are designed to output power to the control units, DCU12 and MCU-001. Do NOT connect MFD8/12 to ports 1 and 2, otherwise MFD8/12 in the earlier production may be damaged. MFD8/12 in the current production has the protection circuit.

See Fig.49.

Fig.48 MFDBB, rear view
Fig.49 RJ45 jacks for Ethernet connection on MFDBB
Table 9 Pin assignment of built-in Hub of MFDBB

NETWORK 1 & 2 E_TD_P

E_TD_N E_RD_P SW_P SW_N E_RD_N PWR_SW_N PWR_SW_P

#1 #2 #3 #4 #5 #6 #7 #8

NETWORK 3 & 4 E_TD_P
E_TD_N E_RD_P SW_P SW_N E_RD_N N.C. N.C.
Power Synchronization Power on/off synchronization amongst all of the NavNet 3D display units can be achieved when the dedicated Ethernet hub HUB-101 is used. Set the corresponding DIP switch in the HUB-101 to ON position to activate this feature.
DIP switches #1 to #8 for ports 1 to 8, from left 1234 5678
Fig.50 HUB-101 with cover removed