Older engines used the ATA (American Trucking Association) data link, then CDL (CAT data link) was introduced. CDL is used on all but a very few of the engines and controls, such as some of the excavators, some hydraulics controls, and some early transmission shift controls. But it's likely if it got designed by CAT E&E it has CDL. Older engines and controls used the ATA data link for installing flash files when they came out (instead of doing hardware/chip changes). CAT then started using the J1939 data link, this is similar to CANBUS. Newer engines use the J1939 to flash, and the field programming interface is now J1939. None of the engine or machine controls directly have MODBUS RTU or TCPIP. CAT originally used the CCM (Customer Communications Module) with a ASCII serial output protocol called M5X. It was not a user friendly protocol and folks like Monico and Millie came to make good money converting M5X to Modbus RTU. The PL1000 is the latest communication interface, there is a version to replace the CCM, and version that has enhanced capability to directly provide Modbus RTU or Modbus TCPIP. The EMCP 3.X control panels communicate with the engie ECM's via J1939, and can provide Modbus RTU data. Hope that helps.
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