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Installation Chapter 2
SMART-MR10/15 User Manual Rev 5 41
2.4.3 Controller Area Network (CAN)
NMEA 2000 is a CAN standard created by the National Marine Electronics Association and designed
to support networking in marine applications. It functions over a longer physical distance, and
supports more physical nodes than ISO 11783. The relationship between NMEA 2000 and SAE J1939
is that J1939 is the standard, while the NMEA 2000 group has added new messages (called PGNs or
Parameter Group Numbers) and a new transport protocol called FastPacket. NMEA 2000 compliant,
for all intents and purposes, means J1939 compliant plus support for new NMEA 2000 messages. In
other word, one cannot have NMEA 2000 without J1939 support as well. J1939 is additionally
“harmonized” with ISO 11783, a standard for the agriculture industry.
The CAN module is activated when a SETCANNAME command is entered, and after a
SAVECONFIG, the CAN module is activated immediately on all subsequent start-ups. The module
supports the following NMEA 2000 Parameter Group Messages (PGN):
• PGN 129029 GNSSPositionData (1 Hz)
• PGN 129025 GNSSPositionRapidUpdate (10 Hz)
• PGN 129026 COGandSOGRapidUpdate (4 Hz)
Table 9: Available CAN Signals on SMART-MR10/15 23-pin Tyco Connector
2.4.4 SMART-MR15 CELLULAR ANTENNA INSTALLATION
The SMART-MR15 has a cellular antenna port to facilitate the connection of an external cellular
antenna. An external antenna must be connected to this port in order to use the integrated cellular
modem.
CAN Pins
CAN1- Pin 3
CAN1+ Pin 4
To comply with FCC regulations limiting both maximum RF output power and
human exposure to RF radiation, the maximum system gain (antenna gain minus
system loss) must not exceed 1.4 dBi in the U.S. Cellular band and 3.0 dBi in the
PCS band for the GSM/GPRS/HSDPA variant, and 6.0 dBi in the Cellular band and
6.0 dBi in the PCS band for the CDMA variant. System loss is the total of external
cable and connector losses and SMART-MR15 internal losses. For reference and
system gain calculation purposes, the SMART-MR15 has internal losses of 0.6 dB
for the 800 MHz Cellular band and 1.8 dB for the 1900 MHz PCS band.