ENGINE AR 5407350 - Caterpillar

Additional RS-485 connection information to consider:
A terminating resistor must be connected to both ends of the J1939 communications bus for proper operation of the network.
16 AWG or 18 AWG common harness wire should be used for wiring the J1939 network as a twisted pair with 1 full twist per inch.
Use good wire routing and wire securing practices to avoid damage to the cable.
Run cable away from high power and high frequency sources to avoid injecting electrical noise into the wiring.
Each device installed on the RS-485 network should have power system electrical connections such that they all share a common ground (BATT-).
Install sealing plugs ( 8T-8737 ) into any unused sockets at the rear of the connector.NMEA Device Communications Wiring Requirements
Illustration 16 g01145762
The "NMEA Device Communications" connection provides a connection between the PL1000T and NMEA devices. The connection conforms to EIA RS-232 standards and will work with any NMEA devices that also conform to EIA RS-232 standards. Table 11 shows the parameters for the "NMEA Device" connections and Illustration 16 shows a typical electrical connections to NMEA devices.
Table 11
NMEA Port Characteristics    
Parameter    Value    
Maximum Cable Length    
30.5 m (100 ft)    
Maximum Conductor to Conductor Cable Capacitance (1)     .002 µF    
Maximum Cable Resistance for a single Conductor (2)     25 Ω    
( 1 ) To measure cable capacitance, disconnect all devices from the network at the device connection such that the network wires are open between the two conductors. Measure the capacitance between the two wires.
( 2 ) To measure cable resistance, disconnect all devices from the network at the device connection such that the network wires are open between the two conductors. Short the wires at the PL1000T Communications ECM device connection. Measure the resistance between the two wires at all other device connections. For the maximum reading taken, divide the resistance measurement by 2 and compare to the value shown.Additional NMEA device connection information to consider:
Either 16 AWG or 18 AWG wire should be used for all RS-232 serial port connections and harnessing.
Use good wire routing and wire securing practices to avoid damage to the cable.
Run cable away from high power and high frequency sources to avoid injecting electrical noise into the wiring.
Each device installed on the NMEA device connection should have power system electrical connections such that they all share a common ground (BATT-).
Install sealing plugs ( 8T-8737 ) into any unused sockets at the rear of the connector.Building the Custom Harness Assembly
Illustration 17 g01112044
Harness ECM connector details (1) 160-7690 Connector (2) Allen bolt (3) 8T-8737 Seal Plug (4) 126-1768 Connector Socket (14 AWG) or 9X-3402 Connector Socket (16-18 AWG) (5) Wire showing stripped length
Refer to Illustration 17 and Illustration 5 to match the correct wires on the harness to the correct socket positions on the connector.
Locate the sealing plugs that will need to be removed from the connector. Then, using a fully insulated piece of 18 AWG wire as a tool, push the sealing plugs