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11.5. NMEA2000-out technical details
11.5.1. NMEA2000 Glossary
Here is a glossary to help with the interpretation of this text:
• Virtual-device: a Battery Monitor, Inverter, or other Victron device that does not have a CAN-bus port by itself, made available
"virtually" on the CAN-bus by the NMEA2000-out function of the GX Device.
• CAN-bus: the VE.Can port on the GX Device, that, in the context of this chapter, is most likely connected to a NMEA2000
network.
• NMEA2000-out function: the software feature in the GX Device, which is described in this chapter.
• NMEA2000: Marine CAN-bus protocol, based on J1939.
• Instance: there are many types of instances, and explained in detail below.
• J1939: A set of standards defining a CAN-bus protocol, defined by the SAE organisation.
• Address Claim procedure (ACL): a mechanism, specified by J1939 and used in NMEA2000, which used by devices on the
network to negotiate and assign each device on the network a unique network addresses. Its is a number from 0 to 252. There
are three special network addresses defined:
1. 0xFD (253) - Reserved
2. 0xFE (254) - Unable to claim address - for example when all others are in use
3. 0xFF (255) - The broadcast address
11.5.2. NMEA2000 Virtual-devices
When the NMEA2000-out feature is enabled, the GX Device acts as a bridge: it will make each Battery monitor, Inverter/charger
or other device that is connected, available individually on the CAN-bus.
Individually, as in each with its own network address, its own device instance, function codes, and so forth.
For example, a GX Device with two BMVs connected on a VE.Direct port and an inverter/charger connected using VE.Bus, will
make the following data available on the CAN-bus:
Table 2.
Address
0xE1
130 (Display)
0x03
35 (Electrical generation)
Page 54
Color Control GX Manual
Class
Function
120 (Display)
170 (Battery)
Description
The GX Device itself
The 1st BMV
Marine MFD integration by NMEA2000
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