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| Illustration 1 | g01636936 |
CAT Data Link
The CAT Data Link is an input and an output of the ECM. The CAT Data Link is designed to communicate with other electronic control modules through the machine harness. The CAT Data Link consists of internal ECM circuits and a twisted pair of wires within the wire harness. The CAT Data Link is bidirectional. The CAT Data Link allows the ECM to receive information and the CAT Data Link allows the ECM to send information.
Caterpillar Electronic Technician (ET) also communicates with other ECM modules through the data link. The CAT ET will list the other ECM modules and the available diagnostic information.
All electronic control modules (ECM) that use the CAT Data Link have a module identifier (MID). The MID is listed for each module:
Engine ECM ... 036
Chassis ECM ... 081
Product Link ... 122
CAN Data Link
The CAN Data Link is an input and an output of the chassis ECM. The CAN Data Link is designed to communicate with other electronic control modules through the machine harness. The CAN Data Link consists of internal ECM circuits and a twisted pair of wires within the wire harness. The CAN Data Link is bidirectional. The CAN Data Link allows the ECM to receive information and the CAN Data Link allows the ECM to send information. The CAN Data Link communicates at a faster rate than the CAT Data Link.