HARNESS AS-CONTROL 2016787 - Caterpillar

Illustration 1 g01259989
Example of a Customer Supplied Radio
Field Conditions
Existing GPS base station that is AccuGrade compatible
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 to 32 VDC.Note: Verify that all of the necessary connections can operate at machine voltages.Answer - By looking in the radio documentation found that radio can run on 9 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 Power Converter to step the voltage down to 12 VDC.
In order to make the necessary connections to the radio, use the information provided by the manufacturer of the radio.
Power
Ground
TXD
RXD
DTRNote: DTR is required by this example in order to make the radio active.
Using 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, KENR8982, "Radio Utility".
Change the settings so that the customer supplied radio and the display 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 the base.Use the display in order to check the" Left data link". The value should be increasing for the integrity. If the value is not increasing, refer to the "Troubleshooting" section below.Information Checklist for Third Party Radio
Table 1
Obtain the manual from the manufacturer of the radio.        
Verify that the radio communicates Compact Measurement Records (CMR)s over RS232. Verify that the settings can be changed in order to match the display.        
Review the power requirements for the radio. Review any special requirements. machine power may run to 28VDC        
Validate the settings of the radio in order to communicate with the base radio.     Radio channel        
Over-the-air data rate    
Find the pin identification for the radio.        
Find the electrical schematic for the machine. Refer to "Radio Pin-Out Tables and Schematics" for