Leica GPS1200 Series Technical Reference Manual page 1379

Example
Event Input Notify Message Format
Field Description
cccc Event count
dddd Event pulse count
This is the count of all pulses including those violating the specified time
guard boundary conditions set in CONFIGURE Event Input. This allows
determination of missed events.
*hh Checksum
<CR> Carriage return
<LF> Line feed
$PLEIR,EI2,292412000,28932,1203,203,1*70
GPS1200 1379