ashtech HDS800, Reference Manual

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Data Output
SBA,DAT: SBAS Data Message
Provided the command below has been run beforehand,
$PASHS,RAW,SBD,<port_ID>,ON
... the SBA,DAT message is output in response to:
$PASHQ,SBD, <port_ID>
...and is in the form:
$PASHR,SBA,DAT,d1,m2,d3,d4,s5*cc
Where:
Parameter Description Range
d1 SBAS SV ID number 33-51
m2
Time tag: hhmmss.hh
The SBA,DAT message contains the time tag of
the beginning of WAAS message transmission
(WAAS message transmission time is 1 second)
000000.00-
235959.99
d3 RTCA message ID 0-63
d4
Error flags (in HEX): bit0-preamble error, bit1-par-
ity error
0-2
s5
RTCA message: 250 bit in 63 HEX numbers. The
data lie from left to right and from high-order to
low-order bits. The two low-order bits in the 63rd
number are not used.
*cc
Checksum, computed by “exclusive-ORing” all of
the bytes in the message between, but not includ-
ing, the “$” and the “*”. The result is “*cc” where c
is a hexadecimal character.
*00-*FF