CASE-DIFFERENTIAL 8V6234 - Caterpillar

Illustration 1 g00751729
Connection points for the Data LinkThere are three serial data links. Illustration 1 shows the connection points at the GSC. These data links enable the GSC to communicate with other devices. These data links are described in the following paragraphs.ALM Data Output - This serial data link is a single directional link. The GSC uses this data link for one-way communication with optional Alarm Modules (ALM) or the optional Customer Interface Module (CIM). The ALM Data Link consists of a single wire that connects the GSC (connector contact 35) to an ALM or a CIM. A return connection (ground) is required between the GSC and the module. See Systems Operation, "Alarm Modules" for more information about the ALM Data Link. Also, see Systems Operation, "Customer Interface Module"for more information on the ALM Data Link.RDM Data Out - This serial data link is a single directional link. The GSC uses this data link for one-way communication with the optional Relay Driver Module (RDM). The RDM Data Link consists of a single wire that connects the GSC (connector contact 30) to the RDM. A return connection between the GSC and the module is also required. An RDM is used in conjunction with the optional Customer Communication Module (CCM). For more information, see Systems Operation, "Relay Driver Module". CAT Data Link - This serial data link is bidirectional. The GSC uses this data link for two-way communication with the engine ECM. The optional Customer Communication Module (CCM) also connects to these contacts. The GSC can communicate with the Engine ECM and the CCM through the same contact. The CAT Data Link uses a shielded twisted pair cable that connects the GSC (connector contact 19 and connector contact 20) to the engine ECM.