BEARING 7H1388 - Caterpillar

Illustration 137 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 AccuGrade System.
Will the machine radio operate within 9 VDC to 32 VDC.Note: Verify all necessary connections can operate at machine voltages.Answer - By looking in the radio documentation found that radio can run on 9 VDC to 32 VDC, but in order for radio to function the DTR line needs to be tied high and it has a limitation of 25 VDC.Solution - Use a 240-2735 DC - DC power Converter to step the voltage down to 12 VDC.
Using the radio manufactures information, make all necessary connections.
Power
Ground
TXD
RXD
DTRNote: DTR is required by this example radio in order to make radio active.
Using the referenced pinouts for the machine harness, wire the following for the machine harness connector.
Power
Ground
COM2 TXDNote: For G-series TTT, COM2 TXD should be COM1 TXD
COM2 RXDNote: For G-series TTT, COM2 RXD should be COM1 RXD.
Configure the machine radio and AccuGrade System to communicate over RS232.ReferenceReference Systems Operation, RENR8083, "Radio Utility"
Change the settings in the Customer Supplied Radio and the Display to match.Default Settings For The Display Baud rate ... 38400 Data Bits ... 8 (Fixed setting on Display) Parity ... None Stop Bits ... 1 (Fixed setting on Display)
Verify that the over-the-air data/communications rate are set the same in both the base and machine radio.The optimal rate may vary depending on the radio. Typically the rate is between 4800 bps and 38400 bps. The same rate must be set in both the base radio and the machine radio. If the same rate is set, you may proceed. If the rates are not the same, use the radio configuration software to set both radios to the same over-the-air data/communications rate.
Connect the new adapter harness to the main harness and to the machine radio.
Apply power to the system and verify the communication to base.Use the Display in order to check the Left data link. Should be increasing for the integrity. If not see the Troubleshooting section.
Third Party Radio Information Checklist
Table 9
Obtain the manual from the radio manufacturer.        
Verify that the radio communicates Compact Measurement Records (CMR)s over RS232. Verify that the settings can be changed to match the Display.        
Review the power requirements for the radio. Review any special requirements. machine power may run to 28VDC        
Validate the radio settings in order to communicate with base radio.     Radio channel        
Over-the-air data rate    
Find pin out information for manufauturer's radio.        
Find drawing or pin out for correct machine. Refer to ""Radio Pin-Out Tables and Schematics"" for additional information.        
Create a simple schematic from the information that was collected in