Furuno M12-05BM+05BF-010 Guide

Furuno CAN bus Network Design Guide
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Furuno CAN bus Network Design Guide
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
NMEA 2000 NMEA 0183
Connector Standard connectors
(Plug and play)
Different connectors of each
manufacturer
Data rate 250k bits/second 4.8k (38.4k) bits/second
Compact binary message ASC II serial communication
Multi-talker, multi-listener Single-talker, multi-listener
Protocol
Network 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 Ethernet
Power Consumption Lower Higher
Bandwidth Low High
Collision Avoidance Yes No avoidance
(Collision detection)
Message Priority Yes No
Pub. No. TIE-00170-B

Furuno CAN bus Network Design Guide
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Backbone
cable
Terminator
Furuno
CAN bus
Device
Drop cable
6 m (max.)
NMEA 2000
T-connector
+Vdc
Shield
Gnd
Terminator
Furuno
CAN bus
Device
Drop cable
Drop cable
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.
(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.
Fig.2 Fig.3
Device
Device
Device Device

Furuno CAN bus Network Design Guide
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Device
Device
Fig.4 Fig.5
Fig.6 Fig.7
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.
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) For connecting segments of backbone cable together
(b) For connecting terminations at the two ends of the cable
(c) For connecting the network power source, and
(d) 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.
Device
Device
Device Device FI-50 FI-50 FI-50
Power supply
Terminator
Terminator
Terminator
Terminator

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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).

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Table 3 Wire colors of heavy cable
Name Pair Color Size Pin#
Shield Drain Bare 18AWG 1
NET-S Power Red 16AWG 2
NET-C Power Black 16AWG 3
NET-H Signal White 18AWG 4
NET-L Signal Blue 18AWG 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 Pair Color Size Pin#
Shield Drain Bare 22AWG 1
NET-S Power Red 22AWG 2
NET-C Power Black 22AWG 3
NET-H Signal White 24AWG 4
NET-L Signal Blue 24AWG 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. Function Color
1 Shield Bare
2 NET-S (Power supply positive, +V) Red
3 NET-C (Power supply common, -V) Black
4 NET-H (CAN-H) White
5 NET-L (CAN-L) Blue
Fig.11 Female Mini connector
Fig.12 Male Mini connector
5
4
3
2
1
25.0 mm
1
2
3
4
525.0 mm
10 mm

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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 Type Code Number Connector fitted
CAN bus light cable (1 m) M12-05BM+05BF-010 000-167-962 Male and Female
CAN bus light cable (2 m) M12-05BM+05BF-020 000-167-963 Male and Female
CAN bus light cable (6 m) M12-05BM+05BF-060 00-167-964 Male and Female
CAN bus light cable (1 m) M12-05BFFM-010 000-167-965 Female
CAN bus light cable (2 m) M12-05BFFM-020 000-167-966 Female
CAN bus light cable (6 m) M12-05BFFM-060 000-167-967 Female
CAN bus heavy cable (1 m) CB-05PM+05BF-010 000-167-968 Male and Female
CAN bus heavy cable (2 m) CB-05PM+05BF-020 000-167-969 Male and Female
CAN bus heavy cable (6 m) CB-05PM+05BF-060 000-167-970 Male and Female
CAN bus heavy cable (1 m) CB-05BFFM-010 000-167-971 Female
CAN bus heavy cable (2 m) CB-05BFFM-020 000-167-972 Female
CAN bus heavy cable (6 m) CB-05BFFM-060 000-167-973 Female
Fig.15 CAN bus light cable Fig.16 CAN bus light cable
with a connector at both ends with a connector at one end
54
3
21
14.5 mm
3
21 5
4
14.5 mm
6 mm

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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 Type Code Number Remarks
Mini T-connector NC-050505-FMF-TS001 000-160-507 for heavy cable
Micro T-connector SS-050505-FMF-TS001 000-168-603 for light cable
Fig.17 Mini T-connector Fig.18 Micro T-connector
(NC-050505-FMF-TS001) (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 Type Code Number Remarks
Male terminator LTWMN-05AMMT-SL8001 000-160-508 Mini connector, Fig.19
Female terminator LTWMN-05AFFT-SL8001 000-160-509 Mini connector, Fig.20
Male terminator LTWMC-05BMMT-SL8001 000-168-604 Micro connector, Fig.21
Female terminator LTWMC-05BFFT-SL8001 000-168-605 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
Female Female
Female, Micro Female
Male Male

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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.
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.
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.
Fig.25 Terminator in DRS2D/4D Fig.26 Terminator in DRS4A/6A/12A/25A
GP-330B
Device Device Device
FI-50
Power supply
J603
TB102
CAN bus cable o
r
NMEA2000 cable
Female Terminator
Backbone cable
to rest of bus
In-line Terminator
Type: FRU-0505-FF-IS
C/N: 000-172-037-10
#5 & #6
#4 & #5
o
r

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(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.
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> Drain
>2> RED
>3> BLK
>4> WHT
120-ohm resistor
>5> BLU
>6>
>7>
>8> PPL
>9> YEL
>10> 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 To get into Setup2 mode, press To choose item, press
FI-501/502/505 3rd and 4th keys from left MODE
FI-503 LOWER and SELECT/CLEAR Upper
FI-504 APP/TRUE and SELECT/CLEAR DISP
FI-506 BRILL and Left arrow key
(To save the change, press BRILL
and Left arrow key again.)
Right arrow key
Contact pin
MJ-A10SPF0015
Connector has
a resistor.

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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 Amp. 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 TB102 in Open Antenna
Pin No. Signal name Remarks Pin No. Signal name Remarks
1 SHIELD 1 SHIELD
2 NC 2NET_S V+ (+15V)
3 NET_S V+ (+15V) 3 NET_C V-
4 NET_C V- 4 NET_H CAN_H
5 NET_H CAN_H 5 NET_L CAN_L
6 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.
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.
15 Vdc, 1A
GP-330B WS-200 SC-30
Combination: YES YES NO
YES NO YES