The LEN is given as a whole number and provides a quick overview of the power distribution and helps to avoid unwanted voltage losses and resulting malfunctions in the backbone. This factor indicates how much power the device needs from the NMEA network and thus helps to calculate how many devices can be integrated into an NMEA2000 system, depending on the power requirements of the devices and the cable length of the network. LEN stands for Load Equivalency Number and refers to the load factor of a device in the network.
Termination resistors - Precisely 2, no more, no less. This can be via T-pieces or other products which will be discussed later. 2 x NMEA 2000 certified devices (at least 1x TX and 1x RX) and a means to connect them to the network. The best way to do this is to place the power supply in the middle of the network.Īn important term in this context is the so-called LEN value. The following are the essential components of any NMEA 2000 network: Power insertion point - fused. It is recommended to connect the NMEA2000 network power supply so that the network is evenly loaded. In any case, make sure that the backbone is terminated at both ends with a terminal resistor. Assuming the voltage distribution is correct, the backbone or the master cable (depending on the type of cable) must not be longer than 200 m. When planning your network, make sure you keep in mind the maximum possible length of backbone cables. Set up the NMEA2000 network backbone / master cable Information can usually be found in your product‘s respective operating instructions.
Before you connect twoĭevices to an NMEA2000 network, you should check whether their PGN (data sets) are compatible. The SBN-1 is a complete 4-port NMEA network that includes built-in termination resistors. 1.6 NMEA 2000 Cable The Mini, Mid and Micro cables contain five wires: One twisted pair (red and black) for 12VDC power, one twisted pair (blue and white) for signal and a drain wire (bare). The Actisense 4-port self-contained NMEA 2000 network makes installing a NMEA 2000 system easier than ever. Number and is used to identify the NMEA2000 data sets. A maximum of 50 physical devices shall be connected to the network, and the disconnection of any device shall not interrupt any other device on the network. The abbreviation PNG stands for Parameter Group
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