Spectra Precision ProFlex 800 Reference Manual - Manual (Page 686)

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Data Output
For more details on the $PASHS,RAW command, refer to the
Set Command Library Chapter.
As an example, the command below will output ION
messages on port A at a rate of 5 seconds:
$PASHS,RAW,ION,A,ON,5
LTN: Latency
Content This message contains the current value of latency. It is
generated in automatic mode using the $PASHS,NME,LTN
command.
The message is as follows:
$PASHR,LTN,d1*cc
d1 is described in the table below.
Example $PASHR,LTN,60*2C
Comments Latency refers to the time it takes for the receiver to compute
a position from the measurement time tag and prepare data
to be transmitted through the serial port. The value of latency
depends on the number of locked satellites.
In time-tagged mode, the value of latency also includes the
time required for the correction stream to go through the data
communication link before arriving at the receiver.
See Also $PASHS,NME
Parameter Description Range
d1 Latency in milliseconds. 0-10000
*cc Optional checksum *00-*FF