ENGINE AR-COMPLETE 2348464 - Caterpillar

Caterpillar makes no claim to compatibility with all radios. Additionally, Caterpillar assumes no responsibility for the performance of a system that is integrated with a Customer Supplied Radio.
The following recommendations must be considered when a Customer Supplied Radio is installed:
18-gauge wire is recommended for all lines. Avoid any wire with a narrower gauge.
Machine pinouts may vary. Consult the Electrical Schematic for each machine to determine the correct pinouts.
These instructions do not address any unique power requirements that may apply to an individual Customer Supplied Radio.Power to a Customer Supplied Radio is provided through the AccuGrade harness at a nominal 24 VDC (15 amp max). Power may vary from 22 - 28 VDC during radio operation. If regulated power is required by the Customer Supplied Radio, it is the responsibility of the customer to provide a power converter to the radio. Additionally, it is the responsibility of the customer to wire the power converter to the radio.
Locate the schematic for the connector for your Customer Supplied Radio.Refer to the owner's manual or the documentation from the manufacturer.
Verify that 24 VDC nominal power is acceptable.Note: If there are any limitations on input power, find a suitable converter. The converter should be wired between the AccuGrade connection and the connection for the Customer Supplied Radio.
Find the required power and communications pins on the radio.These pins may vary for each Customer Supplied Radio. The pins that are listed below are the minimum that are required:
+ BAT
GRND
TX
RX
Locate the electrical schematic for the AccuGrade System and the specific Caterpillar machine. Schematics are available at SISWeb.
Find the 8-pin connector for the GPS radio.
Trace back from the 8-pin connector to the 12-pin connector.Note the pin number for the following connections:
+ PWR
GRND
COM 2 TX
COM 2 RX
Wire the new cable.Use the pinouts that are noted in Steps 1 and 2.
Illustration 1 g01259989
Customer Supplied Radio Example
Field Conditions
Existing AccuGrade compatible GPS base station
Customer Supplied Radio at the GPS base stationRequired
Create a cable that connects a compatible Customer Supplied Radio to the AccuGrade System.
Can the Customer Supplied Radio communicate CMR data over RS-232.Yes - The Customer Supplied Radio is compatible with the AccuGrade System.No - The Customer Supplied Radio is not compatible with the AccuGrade System.
Will the machine radio operate within 9-32 VDC.Note: Verify that all necessary connections can operate at machine voltages.Answer - By looking in the radio documentation, found that the radio can run on 9-32 VDC. In order for the radio to function, the DTR line needs to be tied high. The line has a limitation of 25 VDC.Solution - Use a DC to DC power Converter to step the voltage down to 12 VDC.
Make all of the necessary connections. Use the information from the manufacture of the radio.
Power
Ground
TXD
RXD
DTRNote: DTR is required by the radio in this example in order to make the radio active.
Use the referenced pinouts for the machine harness. Wire the following for the machine harness connector.
Power
Ground
COM2 TXD
COM2 RXD
Configure the machine radio and the AccuGrade System to communicate over RS232.ReferenceReference Systems Operation, "Radio Utility"
Ensure that the