RoyalTek rdr-3200 Benutzerhandbuch

 

 

  This sentence contains the GPS antenna detector information which read from GPS 

module and send to the CAN bus. 

 The protocol is illustrated as follows: 

Item 

     Field 

         Description 

1 

$ 

Beginning of sentence 

2 PSRF122 

Message 

Header 

1: antenna connected

3 

GPS antenna status 

0: antenna not connected 

4 

*CC<CR><LF> 

Check Sum and sentence termination delimiter.
The algorithm of checksum calculation is same
With the one to calculate NMEA checksum. 

 
 
  
  Example: 
           $PSRF 122,1*3B<CR><LF> 

           GPS antenna connected  

Check sum= 0x3B. 

 

 

22