Instruction manual

Operation Page 25
Operation
CPD with RTCM-RTK type 18/19 message
Perform the following checklist prior to software setup.
1. The hardware setup is complete and correct
2. All parameters are assumed to be at the factory default settings. Refer to
“Receiver Memory Reset” on page 16 on how to reset the parameters to the
factory defaults.
3. Check the options in the Sensor against the following:
• Base—‘J’ Real-time Z and ‘D’ Differential options
• Rover—‘J’ Real-time Z and (‘D’ Differential or ‘U’ Differential
Remote option)
Refer to “Optional Features” on page 5 for information on how to verify these
options. Refer to Chapter 4, Command Response Formats for a detailed explanation
of the serial commands.
Base Setup
1. Power on the base Sensor.
2. Monitoring the satellite tracking and the autonomous position as previously
section
3. Enter and verify the base coordinate as described in section Entering Base
Station Coordinates. Note the coordinates should be corrected for any
antenna phase center offsets, if applicable.
4. Send the following commands to the base Sensor
a. $PASHS,RTC,BAS,B
Configures the Sensor into RTCM base mode and uses port B for output
differential message.
* Type 18/19A is for Ashtech-to-Ashtech operation.
 Choke ring antenna, short baseline, 1 Hz, fast CPD off
 Type 18/19B is for Ashtech-to-Trimble operation.
CAUTION
Be aware that once RTCM base or rover mode is selected on a given
port, all set and query command to that port will be ignored. As a
general practice, always use one port to set another port as RTCM
differential port. For example, use port A to set port B, and vice versa.
Table 2.7: Differential RTCM Message Types (continued)
Mode Message Type Send Receive Description
Expected
Accuracy