CASE GP-TRANSFER 6Y6324 - Caterpillar

The Customer Communication Module (CCM) comes with CCM PC software that operates on Windows. The software utilizes the M5X protocol to allow the CCM to communicate with a remote personal computer (PC). In some installations, the user will require customized software. Customized software is required when enhancements to the PC software are needed. Customized software is also required when the host is NOT a personal computer.The CCM communicates with the host equipment via a standard RS-232C serial data link. The serial data link uses the M5X protocol to transfer data. The M5X commands allow the user to periodically request a broadcast of multiple engine parameters and generator parameters. The parameters can be used by host equipment for monitoring. Single parameter read commands and write commands allow the user to control the engine from the host device.The CCM provides the communication link between the host device and the engine or the generator set. The engine parameters and the generator parameters are given a unique Parameter Identifier (PID). Refer to the Operation and Maintenance Manual, "Parameter Identifiers" section. The host equipment can create a maximum of eight lists. The lists are stored in non-volatile memory in the CCM. Each list can have a maximum of eight PID's. These lists contain multiple engine parameters that are broadcast to the host device from the CCM.Most Caterpillar electronic systems that use the CCM can provide a maximum of 50 parameters per second. These parameters are sent to a remote computer system through the RS-232C connection. Other factors will decrease the number of parameters per second. When you connect with a modem at less than 4800 baud, the throughput will be reduced. A 2400 baud connection through a cellular phone will reduce the throughput to 29 parameters per second. CAT Data Link loading can also cause reduced throughput. In some complex systems, other modules on the CAT Data Link utilize system resources. The system throughput may be reduced to 40 parameters per second.Stable parameters should be requested less frequently in order to optimize data transfer. This will minimize communication loading. Some examples of stable parameters include the following items: hourmeters, atmospheric pressure, temperatures and diagnostics. Parameters that are more dynamic such as engine speed and oil pressure can be requested more frequently. Use good judgment to determine the update rate of individual parameters.The M5X protocol command messages that are transmitted to the CCM must be in ASCII format. The response to the command messages will always be returned in ASCII format. The broadcast may be configured to be either ASCII or Binary.Standard Preamble
The first four bytes of every IID contain a standard preamble.50xxyyzz (IID specific data)The 50 indicates M5X protocol.xx is the module identifier of the sending module.
Table 1
XX     Module    
00     Host Device    
01     CCM    yy is the Instruction Identifier.
Table 2
yy     IID    
00     Special Parameter Command    
10     Broadcast Response    
11     Activate