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Operation
Chapter 3 
SMART-AG User Manual Rev 2 
29
and [carriage return] indicates that you should press the <Enter> key.
The above example illustrates command input to the base receiver’s COM2 port, which sets the 
position of the base station receiver for differential operation. Confirmation that the command was 
actually accepted is the appearance of <OK.
If a command is entered incorrectly, the receiver responds with:
<I
NVALID
 M
ESSAGE
 ID
(or a more detailed message)
WARNING!:
Ensure the Control Panel’s Power Settings on your PC/laptop are not set to go 
into Hibernate or Standby modes. Data will be lost if one of these modes occurs 
during a logging session.
3.3
Transmitting and Receiving Corrections
Corrections can be transmitted from a base station to a rover station to improve position accuracy. The 
base station is the GNSS receiver, which is acting as the stationary reference. It has a known position 
and transmits correction messages to the rover station. The rover station is the GNSS receiver which 
does not know its exact position and can be sent correction messages from a base station to calculate 
differential GNSS positions. An example of a differential setup is given in Figure 5 on Page 30.