ELEMENT-FILTER 9T9054 - Caterpillar

Illustration 1 g00297407
Main Display Module (1) Alert Indicators. (2) Display area.The main display module continuously monitors all machine systems. The main display module makes decisions that are based upon the input from the machine systems or other electronic control modules. The main display module sends information to other electronic controls on the machine. The input and output of this information takes place over the CAT data link. The outputs on the main display module notify the operator and the service person of the status of the machine systems. The following outputs are on the Caterpillar Monitoring System: the quad gauge, the main display module and the action alarm. A connector with 40 contacts is located on the rear of the module. This connector connects the necessary harness wiring to the inputs and outputs. Inputs/Outputs
CAT Data Link
The CAT data link (connector contacts 5 and 14) is used to communicate with other electronic control modules on the machine. The CAT data link is bidirectional. This allows the modules to input the information. Also, the modules can output the information. This permits sharing of information such as engine oil pressure, and diagnostics.Display Data Link
The display data link (connector contacts 15, 25 and 35) provides the electrical signals in order to operate the display module. These display modules provide information about the machine systems to the operator. Each module and each display indicator is identified by an identifier or an address. Data is continuously output from the main display module to the other display modules. The module that is addressed returns the data to the main display module. This confirms the receipt of the data.Inputs
The inputs tell the main display module the way to operate, and the status of the engine systems. Three types of inputs exist: switch input, sensor input and sender input. Switches and harness wiring provide a ground to the switch or an open signal to the switch inputs. Sensors provide a changing signal to the sensor inputs of the main display module. Senders provide a changing resistance to the sender inputs of the main display module. These inputs are programmed at the time of installation in order to define the components that are monitored. In order to determine the inputs on the main display module that are programmed, see the Electrical System Schematic in the Service Manual.Switch Inputs - Uncommitted
The following connector contacts are the uncommitted switch inputs: 7, 9, 11, 17, 19, 20, 21, 26, 29, 32, 36, 37, 39 and 40 During normal operation, these switch inputs are open. Switch Inputs - Programming
The programmed switch inputs are the following connector contacts: 3, 6, 12, 16, 22 and 31 The operation of the main display module is determined by the programmed switch inputs. The main display module operates in a manner that corresponds to the open state or the grounded state of the programmed switch inputs. These inputs receive information from a permanent connection. The inputs for the programming switch consist of the information from the