Understand the backbone and drops

The backbone is the network's main cable. Devices connect through T-pieces and drop cables. Actisense specifies a 120-ohm terminator at each end and a maximum individual drop length of 6 meters.

Conceptual component layout. The actual power location, cable lengths and connectors depend on your network design.

Before you buy

1. List each display, sensor and gateway by exact model.
2. Write down the required data: for example, GPS position to a radio or engine information to a display.
3. Confirm that the sending and receiving devices support the needed PGNs—the messages used on the network.
4. Measure the backbone route and each device drop. Check cable-type length limits in the reference.
5. Calculate network power demand from the device manuals and document the prescribed power protection.
6. Inventory existing terminators and power connections before adding a starter kit.

Power and termination checks

Actisense specifies a 9–16V network supply range and recommends checking at the power entry and network ends. Account for device load and voltage drop when planning the power insertion point.

With network power off, its diagnostic procedure measures across NET-H and NET-L: about 60 ohms indicates two parallel 120-ohm terminators; 120 ohms suggests one and 40 ohms suggests three. Use the documented connector pinout and test method. Resistance testing is performed with power off.

Power and termination checks do not prove data compatibility. If a device appears but the wanted information does not, revisit the sending/receiving PGNs, configuration and gateway requirements.

A practical fault record

Label each cable and change one documented item at a time. Keep the original configuration record so troubleshooting does not become guesswork.

Parts and manufacturer references

Actisense: building and testing a network
Garmin: network termination