Furuno M12-05BM+05BF-010 Design Manual page 11

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.
From PWR PCB
J602
+15 V H >1>
+15 V C >2>
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.
Fig.31 Connection of power supply to network through MFD
To network bus
(11.6Vdc, 1A with a 12 Vdc
power supply connected)
12 to 24 Vdc for MFD
Fig.32 Connection of network power supply to MFD
03P9462
VCC_CAN
Regulator
U13
Fig.30 CAN bus interface board in DRS
Device
"NMEA2000"
J603
>5> Net_H
F1 (1.5 A) >6> Net_L
>3> Net_S (+15 V)
>4> Net_C
"DATA2"
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)
10 Vdc to 16 Vdc,
1 amp Maximum
11
Furuno CAN bus Network Design Guide
Power supply
Light green
Pin #18
_
+