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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.
Connector
Data rate
Protocol
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.
Power Consumption
Bandwidth
Collision Avoidance
Message Priority
Table 1 NMEA 2000 vs. NMEA 0183
NMEA 2000
Standard connectors
(Plug and play)
250k bits/second
Compact binary message
Multi-talker, multi-listener
Network
Table 2 CAN vs. Ethernet
CAN
Lower
Low
Yes
Yes
Furuno CAN bus Network Design Guide
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)
Ethernet
Higher
High
No avoidance
(Collision detection)
No
1
Pub. No. TIE-00170-B
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Related Manuals for Furuno M12-05BM+05BF-010
Summary of Contents for Furuno M12-05BM+05BF-010
- Page 1 Furuno CAN bus Network Design Guide Pub. No. TIE-00170-B 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?
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Page 2: Network Connections
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... - Page 3 Terminator Device Device Fig.4 Fig.5 Terminator 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. FI-50 FI-50 Device FI-50 Device Terminator Power supply Fig.8 Daisy chain connection of FI-50 series...
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Page 4: Network Cable
Furuno CAN bus Network Design Guide 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. -
Page 5: Network Connector
“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. - Page 6 Furuno CAN bus Network Design Guide 14.5 mm 6 mm Fig.13 Female Micro connector 14.5 mm 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.
- Page 7 (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...
- Page 8 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.
- Page 9 Furuno CAN bus Network Design Guide (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)
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Page 10: Network Power Supply
Furuno CAN bus Network Design Guide 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. - Page 11 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.
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Page 12: Network Grounding
Furuno CAN bus Network Design Guide 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 J702 J501 J4 NMEA2000 1.1A NET_S_IN >17> >1> >1>... - Page 13 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.
- Page 14 Furuno CAN bus Network Design Guide 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.
- Page 15 The total drop cable length must not exceed 60 m and no single drop cable should exceed 6 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.
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Page 16: Adding A New Device
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. - Page 17 Furuno CAN bus Network Design Guide Fig.41 shows a typical Furuno CAN bus network by using a junction box FI-5002. FI-5002 CN1 CN2 CN3 to CN5 : Internal terminator MAX. 6 m 12 Vdc Device Device (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.
- Page 18 Furuno CAN bus Network Design Guide Device Device Device FI-5002 Terminator Terminator 12 Vdc Device T-connector Fig.44 Network with two terminators connected to T-connectors FI-5002 FI-5002 FI-5002 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.
- Page 19 Furuno CAN bus Network Design Guide More complex networks are designed by using a network Hub, HUB-101 as shown in Fig.47. SC-30 CAN bus (1) PSU-012 HUB-101 Ethernet 12-24 Vdc DFF-1/3 12 Vdc for CAN bus CAN bus (2) T-connector...
- Page 20 Furuno CAN bus Network Design Guide Fig.49 RJ45 jacks for Ethernet connection on MFDBB Table 9 Pin assignment of built-in Hub of MFDBB NETWORK 1 & 2 NETWORK 3 & 4 E_TD_P E_TD_P E_TD_N E_TD_N E_RD_P E_RD_P SW_P SW_P SW_N...
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