SHIM 4J1105 - Caterpillar

J1939 Bridge
The PL1000T, when configured to provide the "J1939 Bridge" functionality, will join two independent J1939 networks into a single J1939 network.
Illustration 1 g01114474
Illustration 1 shows a complete "J1939 Bridge" network. The two independent J1939 networks are joined through the PL1000T. When configured to provide the "J1939 Bridge" functionality, the PL1000T ECM functions as a repeater between the two J1939 networks. The PL1000T will forward any incoming J1939 data to the bridged network, regardless of message format or data content.All J1939 messages on Network 1 will be relayed to Network 2, and all J1939 messages on Network 2 will be relayed to Network 1. Each message being relayed will be presented entirely on the destination J1939 Network. Each message will appear to have originated on the destination J1939 network.An example application for implementation of the "J1939 Bridge" feature is on a marine vessel. In some larger marine vessels the engines are typically located a significant distance from the bridge or engine monitoring station. Typical CAN data link physical network specifications require the wiring be limited to a total distance of no greater than 40 m.The "J1939 Bridge" feature of the PL1000T can provide two physical networks while maintaining a single logical network, which will allow wiring on each CAN network to run a total of 40 m (131 ft) each. With an available 40 m (131 ft) on each physical link, the total logical CAN network is now limited by the total of 80 m (262 ft).In this particular example the PL1000T would be positioned mid distant between the engine room and the bridge or monitoring station.CAN Extension Bridge
The PL1000T, when configured to provide the CAN Extension Bridge functionality, will join two CAN networks into a single network. While similar in function to the "J1939 Bridge" feature, the CAN Extension Bridge feature allows a much longer span and requires two PL1000Ts.
Illustration 2 g01114482
Illustration 2 shows a complete CAN "Extension Bridge" network. "Network 1" is logically connected to "Network 2" through the RS-485 network that is used between the two PL1000Ts.There can also be a logical connection between Network 3 and Network 4 through the same RS-485 Network and PL1000Ts. When configured to provide the "CAN Extension Bridge" functionality, each of the PL1000Ts will "multiplexe" and "de-multiplexe" the J1939 communications over the RS-485 network.The two new logical networks share the RS-485 connection. The data from CAN networks 1 and 2, is not available on networks 3 or 4. The reverse is also true. Each message is being relayed on the two independent logical networks.An example application for implementation of the "CAN Extension Bridge" feature is on a marine vessel. In some larger marine vessels the engines are typically located a significant distance from the bridge or engine monitoring station. Typical CAN data link physical network specifications require the wiring be limited to a total distance of no greater than 40 m (131 ft).The "CAN Extension Bridge" feature can accommodate four physical networks while maintaining two independent logical networks. The "CAN Extension