ADAPTER 4P2383 - Caterpillar

CCM, Electronic Engine Controller and Host Device Communication OverviewAs purchased, the Customer Communication Module (CCM) comes with Windows compatible software that utilizes M5X protocol to allow the CCM to communicate with a remote personal computer (PC). In some installations, the user will require customized software when a host device other than a personal computer [such as a Programmable Logic Controller (PLC)] is used or when the application requires enhancements to the PC software provided.The CCM communicates with the host computer via a standard RS-232C serial data link. This serial data link uses M5X protocol to send and receive data. The M5X commands allow the user to periodically request a broadcast of multiple engine or generator parameters for monitoring by the host device. Single parameter read and write commands allow the user to control the generator set from the host device.The Remote PC software creates up to eight lists that are stored in non-volatile memory in the CCM. These lists contain multiple engine parameters that are broadcast to the host device from the CCM through the RS-232C network. The engine parameters are given a unique parameter identifier (PID), refer to Parameter Identifiers (PID) section. The CCM provides the communication link between the host device and the engine governed by the electronic engine controller.The M5X command messages sent to the CCM must always be sent in ASCII format, and the M5X status replies will always be returned in ASCII format. The command message contains an Instruction Identifier (IID). Numbers preceded by $ are in hexadecimal form. The first four bytes of every IID contain a standard preamble.The standard preamble is 50 xx yy zz.The 50 indicates M5X protocol.The xx is the sending module identifier (CCM or PC). $00 = User's host device$01 = Customer Communication ModuleThe yy is the Instruction Identifier (IID). $00 = Special Parameter Command$10 = Broadcast Response$11 = Activate A Broadcast List$12 = Deactivate A Broadcast List$13 = Create A Broadcast List$15 = Status Reply To IID 11, 12, 13$24 = Single Parameter Read Request$25 = Single Parameter Read Response$34 = Single Parameter Write Request$35 = Single Parameter Write ResponseThe zz is the number of bytes in the message after this byte. It does not include the checksum or carriage return. M5X Message Checksums: The second to last byte of every IID is the checksum, followed by $0D (ASCII carriage return). The least significant byte (bits 1-8) is used in calculating the checksum. The checksum is the 2's complement of the sum of the preceding bytes of the message. The sum of the checksum and the preceding bytes will equal 0.IID 00 - Special Parameter Command
The response to an IID 00 will be IID 25 Single Parameter Read Response.A typical IID 00 example is $500000zz00240083ddddddcs0D. This example contains three bytes of data. IID 10 - Broadcast Response
A typical IID 10 example is $500110zz0124ddd1,ddd2,ddd3,ddd4,ddd5, ddd6,ddd7,ddd8cs0D IID 11 - Activate a Broadcast List
The response to IID 11 will be IID 15 Status Reply.A typical IID 11 example is $500011zz01cs0D